US20130022328A1 - Drop Terminal with Anchor Block for Retaining a Stub Cable - Google Patents
Drop Terminal with Anchor Block for Retaining a Stub Cable Download PDFInfo
- Publication number
- US20130022328A1 US20130022328A1 US13/455,351 US201213455351A US2013022328A1 US 20130022328 A1 US20130022328 A1 US 20130022328A1 US 201213455351 A US201213455351 A US 201213455351A US 2013022328 A1 US2013022328 A1 US 2013022328A1
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- US
- United States
- Prior art keywords
- anchor block
- fiber optic
- drop terminal
- cable
- optical fibers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
- G02B6/4477—Terminating devices ; Cable clamps with means for strain-relieving to interior strengths element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3897—Connectors fixed to housings, casing, frames or circuit boards
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4441—Boxes
- G02B6/4446—Cable boxes, e.g. splicing boxes with two or more multi fibre cables
- G02B6/4447—Cable boxes, e.g. splicing boxes with two or more multi fibre cables with divided shells
Definitions
- the present disclosure relates to fiber optic cable telecommunication systems. More particularly, the present disclosure relates to drop terminals used in fiber optic cable telecommunication systems.
- Fiber optic cables are widely used to transmit light signals for high speed data transmission.
- a fiber optic cable typically includes: (1) an optical fiber or optical fibers; (2) a buffer or buffers that surrounds the fiber or fibers; (3) a strength layer that surrounds the buffer or buffers; and (4) an outer jacket.
- Optical fibers function to carry optical signals.
- a typical optical fiber includes an inner core surrounded by a cladding that is covered by a coating.
- Buffers e.g., loose or tight buffer tubes
- Strength layers add mechanical strength to fiber optic cables to protect the internal optical fibers against stresses applied to the cables during installation and thereafter.
- Example strength layers include aramid yarn, steel and epoxy reinforced glass roving.
- Outer jackets provide protection against damage caused by crushing, abrasions, and other physical damage.
- Outer jackets also provide protection against chemical damage (e.g., ozone, alkali, acids).
- Fiber optic cable connection systems are used to facilitate connecting and disconnecting fiber optic cables in the field without requiring a splice.
- a typical fiber optic cable connection system for interconnecting two fiber optic cables includes fiber optic connectors mounted at the ends of the fiber optic cables, and an adapter for mechanically and optically coupling the fiber optic connectors together.
- Fiber optic connectors generally include ferrules that support the ends of the optical fibers of the fiber optic cables. The end faces of the ferrules are typically polished and are often angled.
- the adapter includes co-axially aligned ports (i.e., receptacles) for receiving the fiber optic connectors desired to be interconnected.
- the adapter includes an internal sleeve that receives and aligns the ferrules of the fiber optic connectors when the connectors are inserted within the ports of the adapter. With the ferrules and their associated fibers aligned within the sleeve of the adapter, a fiber optic signal can pass from one fiber to the next.
- the adapter also typically has a mechanical fastening arrangement (e.g., a snap-fit arrangement) for mechanically retaining the fiber optic connectors within the adapter.
- a mechanical fastening arrangement e.g., a snap-fit arrangement
- PONS passive optical networks
- a service provider may employ a central office, or head end, containing electronic equipment for placing signals onto optical fibers running to user premises.
- End user premises may employ equipment for receiving optical signals from the optical fibers.
- the central office, or head end, transmission equipment and/or the transmission equipment located at the end user premises may, respectively, use a laser to inject data onto a fiber in a manner that may not require the use of any active components, such as amplifiers between the central office, or head end, and/or the end user premises.
- PONS may be attractive to service providers because passive networks may be less costly to maintain and/or operate as compared to active optical networks and/or older copper based networks, such as a public switched telephone network (PSTN).
- PSTN public switched telephone network
- PONS may provide sufficient bandwidth to meet a majority of end users' high bandwidth communication needs into the foreseeable future.
- transmission equipment may transmit signals containing voice, data and/or video over a fiber strand to the premises.
- An optical fiber may be split using, for example, passive optical splitters so that signals are dispersed from one fiber (the input fiber) to multiple output fibers running to, for example, user premises from a convergence point in the network.
- An optical fiber routed to a user's premises may be routed via a fiber drop terminal en route to the premises.
- signals appearing on one or more optical fibers may be routed to one or more end user premises.
- Fiber drop terminals may be mounted in aerial applications, such as near the tops of utility poles, along multi-fiber and/or multi-conductor copper strands suspended between utility poles.
- Fiber drop terminals may also be installed in junction boxes mounted at ground level and/or in below-grade vaults where utilities are run below ground.
- Example fiber drop terminals are disclosed at U.S. Pat. No. 7,120,347; U.S. Patent Publication No. US 2005/0213921; and U.S. Patent Publication No. US 2006/0153517.
- the drop terminal for use in a fiber optic telecommunication network.
- the drop terminal includes a plurality of fiber optic adapters having outer connector ports that are accessible from outside the drop terminal.
- the drop terminal receives a fiber optic cable having a plurality of optical fibers.
- Fiber optic connectors are positioned at the ends of the optical fibers.
- the fiber optic connectors are inserted into inner connector ports of the fiber optic adapters.
- the drop terminal also includes an anchor block for securing the fiber optic cable to a main housing of the drop terminal.
- the anchor block can be secured to the main housing of the drop terminal by a mechanical interlock.
- Another aspect of the present disclosure relates to a drop terminal having a transparent interior shield or liner that retains fibers in position within the drop terminal during assembly of the drop terminal.
- inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.
- FIG. 1 shows a fiber optic network into which drop terminals in accordance with the principles of the present disclosure can be incorporated
- FIG. 2 is a perspective view of a drop terminal having features that are examples of inventive aspects in accordance with the principles of the present disclosure
- FIG. 3 is a front view of the drop terminal of FIG. 2 ;
- FIG. 4 is a side view of a drop terminal of FIG. 2 ;
- FIG. 5 is an exploded, rear view of the drop terminal of FIG. 2 ;
- FIG. 6 is a rear, perspective view of the drop terminal of FIG. 2 with a rear piece of the drop terminal removed and a liner of the drop terminal exploded to show an interior of the drop terminal;
- FIG. 7 is a perspective view of a front side of a back piece of a housing of the drop terminal of FIG. 2 ;
- FIG. 8 is a plan view of the front side of the back piece of FIG. 7 ;
- FIG. 9 is a cross-sectional view taken along section line 9 - 9 of FIG. 2 ;
- FIG. 10 is a top, perspective view of a cable anchor block incorporated within the drop terminal of FIG. 2 ;
- FIG. 11 is a top, plan view of the cable anchor block of FIG. 10 ;
- FIG. 12 is a bottom, plan view of the cable anchor block of FIG. 10 ;
- FIG. 13 is a cross-sectional view taken along section line 13 - 13 of FIG. 11 ;
- FIG. 14 is a perspective view of the fiber management liner of the drop terminal of FIG. 2 ;
- FIG. 15 is an exploded view of a fiber optic adapter of the drop terminal of FIG. 2 ;
- FIG. 16 is a cross-sectional view cut lengthwise through the fiber optic adapter of FIG. 15 ;
- FIGS. 17-21 show a sequence of steps for securing an optical cable to the drop terminal of FIG. 2 and for routing fiber within the drop terminal of FIG. 2 ;
- FIG. 22 shows a fiber optic connector mounted to a drop cable adapted to be interconnected with the drop terminal of FIG. 2 .
- FIG. 1 illustrates an exemplary passive optical network 100 adapted to provide fiber-to-the-premises (FTTP).
- the optical network 100 may include a central office 110 that connects a number of end subscriber locations 115 (also called end user locations 115 herein) in a network.
- the central office 110 may additionally connect to a larger network, such as the Internet (not shown) or a public switched telephone network.
- the various lines of the network can be aerial or housed within underground conduits (e.g., see conduit 105 ).
- the optical network 100 includes feeder cables (e.g., main cable 120 ) associated at one end with the central office 110 and from which distribution cables branch.
- the main cable 120 may have on the order of 12 to 48 fibers; however, alternative implementations may include fewer or more fibers.
- the optical network 100 may include fiber distribution hubs (FDHs) 130 that receive fibers of the feeder cable 120 extending from splice locations 125 and that output one or more distribution cables 122 .
- FDHs fiber distribution hubs
- an FDH 130 is an equipment enclosure that may include a plurality of optical splitters (e.g., 1-to-8 splitters, 1-to-16 splitters, or 1-to-32 splitters) for splitting the incoming fibers of the feeder cable 120 into a number (e.g., 216 to 432) of output distribution fibers.
- the distribution cable 122 extends from an FDH 130 to a number of end user locations 115 .
- the optical network 100 typically includes breakout locations 116 at which branch cables (e.g., drop cables, stub cables, etc.) 124 are separated out from or electrically coupled (e.g., spliced, connectorized, etc.) to distribution cables 122 .
- Stub cables 124 are typically routed from breakout locations 116 to intermediate access locations 104 such as a pedestals, drop terminals, or hubs.
- Intermediate access locations 104 can provide connector interfaces located between breakout locations 116 and the end user locations 115 .
- Drop cables are cables that typically form the last leg to an end user location 115 .
- drop cables can be routed from intermediate access locations 104 to end user locations 115 .
- Drop cables also can be routed directly from breakout locations 116 to end user locations 115 , thereby bypassing any intermediate access locations 104 .
- branch cables 124 can be coupled to distribution cables 122 using factory integrated terminations to provide environmentally sound and cost effective splicing protection.
- Factory integrated terminations may use factory integrated access (tap) points at specified points, such as at breakout locations 116 , in the optical network 100 instead of manually installed splices.
- These factory integrated access points may be connectorized to provide a simple plug and play approach in the distribution portion of the optical network 100 when connecting end user locations 115 to the optical network 100 .
- implementations consistent with the principles of the invention may use rugged Outside Plant (OSP) connectors that can accommodate single or multi-port connectors.
- OSP rugged Outside Plant
- FIGS. 2-6 show a drop terminal 200 having features that are examples of inventive aspects in accordance with the principles of the present disclosure.
- the drop terminal 200 is adapted for use within a fiber optic network.
- the drop terminal 200 can be used at a location such as an intermediate access location 104 shown at FIG. 1 .
- the drop terminal 200 includes a main housing 202 having a central longitudinal axis 201 that extends from a first end 204 to a second end 206 of the main housing 202 .
- the main housing 202 includes a front piece 208 and a back piece 210 that cooperate to define an enclosed interior 209 (see FIG. 5 ) of the main housing 202 .
- the front and back pieces 208 , 210 are joined by fasteners 212 (e.g., bolts or other fastening elements) spaced about a periphery of the main housing 202 .
- the front and back pieces 208 , 210 are elongated along the central axis 201 so as to extend generally from the first end 204 to the second end 206 of the main housing 202 .
- the drop terminal 200 also includes fiber optic adapters 214 mounted to the front piece 208 of the main housing 202 .
- the fiber optic adapters 214 each include an outer port 216 (see FIGS. 2 and 16 ) accessible from outside the main housing 202 and an inner port 218 (see FIGS. 6 and 16 ) accessible from within the main housing 202 .
- the second end 206 of the main housing 202 defines a cable port 220 for allowing a fiber optic cable 222 to enter/exit the interior 209 of the main housing 202 .
- the drop terminal 200 also includes an anchor block 224 for use in mechanically securing the fiber optic cable 222 to the main housing 202 .
- the anchor block 224 includes a fan-out portion 226 that fans-out/spreads-apart optical fibers 228 of the fiber optic cable 222 that are routed and managed within the interior 209 of the main housing 202 .
- An inner fiber optic connector 230 (see FIG. 6 ) is mounted at the end of each of the optical fibers 228 .
- the inner fiber optic connectors 230 are inserted within the inner ports 218 of the fiber optic adapters 214 .
- the drop terminal 200 also includes an inner liner 232 (i.e., a fiber protector or shield) (see FIGS.
- the drop terminal 200 further includes a gasket 211 (see FIG. 5 ) mounted between the front and back pieces 208 , 210 of the main housing 202 .
- the gasket 211 extends around the perimeter or periphery of the main housing 202 and prevents moisture from entering the interior of the assembled main housing 202 .
- the drop terminal 200 can be installed at a location such as one of the intermediate access locations 104 of the optical network 100 of FIG. 1 .
- the fiber optic cable 222 is a stub cable routed from a breakout location of a distribution cable, and the drop terminal 200 provides connection locations for connecting subscriber locations to the fiber optic network.
- the drop terminal 200 can provide easily accessible locations for connecting drop cables to the fiber optic network.
- first ends of the drop cables can be plugged into outer ports 216 of the fiber optic adapters 214
- second ends of the drop cables can be plugged into network interface devices at subscriber locations.
- the optical fibers 228 of the fiber optic cable 222 are adapted to carry/convey optical signals.
- the optical fibers 228 can each include a core surrounded by cladding.
- the core is the light-conducting central portion of the optical fiber 228 .
- the cladding surrounds the core and is composed of a material having a lower index of refraction than the material of the core. Light is internally reflected within the core to transmit the optical signal along the core.
- the optical fibers 228 are contained within a central buffer tube 300 of the fiber optic cable 222 .
- the fiber optic cable 222 also includes strength members 302 (e.g., epoxy reinforced glass roving, aramid yarn, metal reinforcing members, or other reinforcing structure) positioned on opposite sides of the central buffer tube 300 for providing the cable with increased tensile strength.
- the strength members 302 and the central buffer tube 300 are positioned within an outer jacket 304 of the fiber optic cable 222 .
- the main housing 202 of the drop terminal 200 includes a length L and a width W.
- the length L is parallel to the central longitudinal axis 201 of the main housing 202 .
- First, second and third rows 306 1 - 306 3 of fiber optic adapters 214 are mounted to the front piece 208 of the main housing 202 .
- Each of rows 306 1 - 306 3 includes four fiber optic adapters 214 spaced-apart across the width W of the main housing 202 .
- the first row 306 1 is located closest the first end 204 of the main housing 202
- the third row 306 3 is located closest the second end 206 of the main housing 202
- the second row 306 2 is located between the first and third rows 306 1 , 306 3 .
- the front face of the front piece 208 has a stepped configuration with three steps 310 1 - 310 3 positioned consecutively along the length L of the main housing 202 .
- Each step 310 1 - 310 3 includes an adapter mounting wall 262 1 - 262 3 defining adapter mounting openings 258 (see FIG. 16 ) in which the fiber optic adapters 214 are mounted. As shown at FIG.
- the adapter mounting walls 262 1 - 262 3 are generally parallel to one another and are spaced apart along the length L of the main housing 202 .
- the adapter mounting walls 262 1 - 262 3 have front faces that are aligned at an oblique angle ⁇ 1 relative to a plane P that extends through the center axis of the fiber optic cable 222 and across the width W of the main housing 202 .
- the angled configuration of the adapter mounting walls 262 causes the fiber optic adapters 214 to be angled relative to the plane P.
- center axes 252 of the fiber optic adapters 214 are shown aligned at an oblique angle ⁇ 2 relative to the plane.
- the outer ports 216 of the fiber optic adapters 214 face generally in the same direction that the fiber optic cable 222 enters/exits the drop terminal 200 .
- the main housing 202 includes first and second end portions 500 , 502 positioned outside the ring defined by the gasket 211 .
- the first and second end portions 500 , 502 include openings for use in receiving fastening structures for use in securing the drop terminal 200 to another structure (e.g., a wall, a pole, etc.).
- the openings include large fastener openings 504 for receiving large fasteners (e.g., lag bolts), smaller fastener openings 506 for receiving smaller fasteners (e.g., screws) and strap openings 508 for receiving fastening straps.
- the cable port 220 of the drop terminal 200 is defined in part by the front piece 208 of the main housing 202 and in part by the back piece 210 of the main housing 202 .
- the cable port 220 has a curved end portion 322 that is configured to provide bend radius protection to the fiber optic cable 222 .
- the curved end portion 322 flares/transitions radially outwardly from a center axis of the cable port 220 as the curved portion extends away from the interior of the main housing 202 to generally form a rounded bell-mouth at the outer end of the cable port 220 .
- a clamping portion 330 of the cable port 220 is defined between a front clamp member 332 and a back clamp member 334 .
- the front clamp member 332 is integral with the front piece 208 of the main housing 202 and the back clamp member 334 is integral with the back piece 210 of the main housing 202 .
- the surface defining the clamping portion 330 of cable port 220 includes gripping structure 335 (e.g., structures such as ribs, projections, or knurling) to facilitate gripping the fiber optic cable 222 when the fiber optic cable 222 is clamped between the front and back clamp members 332 , 334 .
- a resilient structure such as a shrink-fit tube 340 (see FIGS. 18 and 19 ) can be positioned about the fiber optic cable 222 within the clamping portion 330 to further provide enhanced gripping of the fiber optic cable 222 .
- the front and back clamp members 332 , 334 can be drawn together to provide a clamping action through the use of fasteners 212 c (see FIG. 3 ).
- the fasteners 212 c are positioned on opposite sides of the clamping portion 330 of the cable port 220 .
- the cable port 220 further includes a pocket 350 (see FIG. 18 ) positioned between the clamping portion 330 and the interior 209 of the main housing 202 .
- the pocket 350 is sized to receive a sealing member 352 (e.g., a resilient sealing member such as a rubber grommet) mounted on about the exterior of the fiber optic cable 222 .
- a sealing member 352 e.g., a resilient sealing member such as a rubber grommet
- the sealing member 352 Underlies the gasket 211 that surrounds the perimeter of the main housing 202 of the drop terminal 200 .
- the sealing member 352 is compressed within the pocket 350 to provide a seal between the outer jacket 304 of the fiber optic cable 222 and the main housing 202 of the drop terminal 200 .
- the fiber optic cable 222 is further secured to the drop terminal 200 by a mechanical interlock.
- the fiber optic cable 222 can be secured to the anchor block 224 (see FIGS. 6 and 18 ) that is then inserted into and interlocked with the main housing 202 so that axial movement of the fiber optic cable 222 relative to the main housing 202 is resisted.
- the anchor block 224 includes a main body 360 that extends from a first end 362 to a second end 364 of the anchor block 224 .
- the main body 360 is elongated along a center axis 361 of the anchor block 224 .
- the second end 364 of the anchor block 224 is configured to mechanically interlock with the main housing 202 of the drop terminal 200 .
- the second end 264 includes first and second interlock tabs 366 , 368 that project outwardly from the main body 360 in opposite directions relative to the center axis 361 .
- the first and second interlock tabs 366 , 368 are configured to be received within a corresponding interlock receptacle 370 (see FIG. 21 ) provided within the interior of the front piece 208 adjacent the second end 206 of the main housing 202 .
- the first and second interlock tabs 366 , 368 are inserted into the interlock receptacle 370 by moving the anchor block 224 in an insertion direction I (see FIG. 18 ) that is transverse to a central axis 221 of the fiber optic cable 222 .
- interference between the first and second interlock tabs 366 , 368 and the structure forming the interlock receptacle 370 resists movement of the anchor block 224 in a direction along the central axis 221 of the fiber optic cable 222 .
- the center axis 361 of the anchor block 224 is coaxially aligned with the central axis 221 of the fiber optic cable 222 .
- the front side of the back piece 210 of the main housing 202 includes a pair of forwardly projecting posts 600 .
- the posts 600 engage the main body 360 of the anchor block 224 to assist in retaining the first end 264 of the main body 360 within the interlock receptacle 370 .
- anchor block 224 is secured to the main housing 202 by a mechanical interlock.
- alternate retention techniques e.g., fasteners, adhesive, etc. could also be used.
- the anchor block 224 also includes structure for securing the fiber optic cable 222 to the main body 360 of the anchor block 224 .
- the second end 364 includes a central groove 372 for receiving the central buffer tube 300 of the fiber optic cable 222 .
- the second end 364 also includes two side grooves 374 that are parallel to the central groove 372 and positioned on opposite sides of the central groove 372 .
- the side grooves 374 are sized to receive the strength members 302 of the fiber optic cable 222 .
- the fiber optic cable 222 is secured to the anchor block 224 .
- a securing material e.g., an adhesive such as epoxy
- the anchor block 224 also includes the fan-out portion 226 for spreading/fanning-out the optical fibers 228 of the fiber optic cable 222 .
- the anchor block 224 includes a fan-out channel 376 that extends from the central groove 372 to the first end 362 of the main body 360 of the anchor block 224 .
- the fan-out channel 376 has a width W i that gradually widens as the fan-out channel 376 extends along the center axis 361 from the central groove 372 to the first end 362 of the anchor block 224 .
- a divider 378 (see FIG. 10 ) is located within the fan-out channel 376 at the first end 362 of the anchor block 224 .
- the divider 378 includes a plurality of openings 380 that individually receive the optical fibers 228 to maintain separation of the optical fibers 228 .
- the optical fibers 228 extend from the end of the central buffer tube 300 through the fan-out channel 376 to the divider 378 .
- the optical fibers 228 each extend through one of the openings of the divider 378 .
- the tapered configuration of the fan-out channel 376 allows the optical fibers 228 to spread apart as the optical fibers 228 extend from the end of the central buffer tube 300 at the central groove 372 to the divider 378 .
- a securing material e.g., an adhesive such as epoxy
- the inner liner 232 of the drop terminal 200 includes a generally rectangular main wall 400 having a width W 2 sized to extend generally across the width W of the main housing 202 , and a length L 2 sized to extend along a majority of the length L of the main housing 202 .
- the inner liner 232 also includes two opposing side walls 402 positioned at opposite sides of the width W 2 that project outwardly from the main wall 400 and extend along the length L 2 of the main wall 400 .
- the inner liner 232 further includes an end wall 403 that projects outwardly from the main wall 400 at one end of the main wall 400 , and a tab 404 .
- the tab 404 is shown generally parallel to the main wall 400 , while the side walls 402 and the end wall 403 are depicted as being generally perpendicular relative to the main wall 400 .
- the inner liner 232 further includes corner notches 406 positioned on opposite sides of the end wall 403 .
- the inner liner 232 is constructed of a sheet of transparent plastic material.
- the side walls connect to the main wall 400 at fold lines 407 .
- end wall 403 connects to the main wall 400 at fold line 409 and tab 404 connects to end wall 403 at fold line 411 . Serrations can be provided at the fold lines to facilitate making the folds.
- the main wall 400 of the inner liner 232 is configured to cover a majority of an open back side of the front piece 208 of the main housing 202 .
- the main wall 400 covers the open back side of the front piece 208
- the side walls 402 project forwardly into the interior of the front piece 208 .
- the side walls 402 can have a depth D sized such that the ends of the side walls rest on the back portions 311 1 - 311 3 of the steps 310 1 - 310 3 when the inner liner 232 is mounted within the front piece 208 .
- the end wall 403 is sized such that the tab 404 rests against the back side of the front wall of the front piece 208 .
- the inner liner 232 functions to retain the optical fibers 228 within the boundaries defined about the perimeter of the front piece 208 . In this way, the optical fibers 228 are prevented from becoming pinched between the front piece 208 and the back piece 210 during assembly of the main housing 202 . Because the inner liner 232 is transparent, the assembler can view the optical fibers 228 through the inner liner 232 to confirm that the optical fibers 228 are routed properly.
- the corner notches 406 provide clearance for accommodating the rounded inner corners defined within the interior of the front piece 208 adjacent the front end 204 of the main housing 202 .
- FIG. 15 illustrates one of the fiber optic adapters 214 in isolation from the main housing 202 of the drop terminal 200 .
- the fiber optic adapter 214 includes a main housing 240 having a first piece 242 that defines the inner port 218 of the fiber optic adapter 214 and a second piece 244 that defines the outer port 216 of the fiber optic adapter 214 .
- the first and second pieces 242 , 244 can be interconnected by a snap-fit connection to form the main housing 240 .
- a split sleeve housing 246 mounts within the interior of the main housing 240 .
- Springs 248 bias the split sleeve housing 246 toward the outer port 216 and allow the split sleeve housing 246 to float within the interior of the main housing 240 .
- the split sleeve housing 246 houses a standard split sleeve 250 that is coaxially aligned with a center axis 252 of the fiber optic adapter 214 .
- the split sleeve 250 includes a first end 254 that faces toward the inner port 218 of the fiber optic adapter 214 and a second end 256 that faces toward the outer port 216 of the fiber optic adapter 214 .
- the fiber optic adapter 214 mounts within one of the adapter mounting openings 258 defined by the front piece 208 of the main housing 202 .
- the fiber optic adapter 214 is retained within the adapter mounting opening 258 by a retention nut 260 threaded on exterior threads defined by the first piece 242 of the main housing 240 .
- a retention nut 260 threaded on exterior threads defined by the first piece 242 of the main housing 240 .
- the retention nut 260 is threaded into place, the corresponding adapter mounting wall 262 1 of the front piece 208 is captured between the retention nut 260 and a shoulder 264 of the main housing 202 .
- a sealing member 266 is compressed between the main housing 240 and the adapter mounting wall 262 to provide an environmental seal about the adapter mounting opening 258 .
- a dust cap 268 is shown mounted covering the inner port 218 of the fiber optic adapter 214 and a plug 270 is shown mounted within the outer port 216 of the fiber optic adapter 214 .
- the plug 270 is threaded within internal threads 272 defined within the outer port 216 .
- the plug 270 also includes a sealing member 274 (e.g., an O-ring) that engages a sealing surface 276 within the outer port 216 to provide an environmental seal between the main housing 240 and the plug 270 .
- a strap 278 secures the plug 270 to the main housing 240 to prevent the plug from being misplaced when removed from the outer port 216 .
- the fiber optic adapters 214 are mounted within the adapter mounting openings 258 defined through the front piece 208 of the main housing 202 .
- the dust caps 268 can be removed to allow the inner fiber optic connectors 230 terminated to the optical fibers 228 to be inserted into the inner ports 218 .
- ferrules of the inner fiber optic connectors 230 are received within the first ends 254 of the split sleeves 250 , and clips 280 function to retain the inner fiber optic connectors 230 within the inner ports 218 .
- the plug 270 of one of the fiber optic adapters 214 is removed from its corresponding outer port 216 to allow an exterior fiber optic connector terminated to the drop cable to be inserted into the outer port 216 .
- An example exterior fiber optic connector 282 mounted at the end of a drop cable 290 is shown at FIG. 22 .
- the exterior fiber optic connector 282 includes a housing 284 on which a retention nut 286 is rotatably mounted. The retention nut 286 can be manually rotated about a central axis 288 of the exterior fiber optic connector 282 .
- the drop cable 290 includes an optical fiber 292 having an end portion mounted within a ferrule 294 supported at one end of the housing 284 .
- the ferrule 294 is received within second end 256 of the split sleeve 250 .
- the split sleeve 250 holds the ferrule of the inner fiber optic connector 230 in coaxial alignment with the ferrule 294 of the exterior fiber optic connector 282 .
- the corresponding optical fibers 228 , 292 held within the ferrules are placed in coaxial alignment thereby allowing light signals to be transferred from fiber to fiber.
- the exterior fiber optic connector 282 is retained within the outer port 216 by threading the retention nut 286 into the internal threads 272 .
- the exterior fiber optic connector 282 includes a sealing member 296 (e.g., an O-ring) that engages the sealing surface 276 to provide an environmental seal between the exterior fiber optic connector 282 and the fiber optic adapter 214 .
- a sealing member 296 e.g., an O-ring
- the fiber optic adapters 214 are first mounted within the adapter mounting openings 258 defined by the front piece 208 .
- the dust caps 268 are then removed from the fiber optic adapters 214 to provide access to the inner ports 218 (see FIG. 17 ).
- the fiber optic cable 222 is then prepared by stripping away an end portion of the outer jacket 304 and trimming back the central buffer tube 300 and strength members 302 to expose the optical fibers 228 .
- the shrink-fit tube 340 and sealing member 352 are then mounted about the exterior of the outer jacket 304 of the fiber optic cable 222 .
- the exposed central buffer tube 300 and strength members 302 are bonded to the anchor block 224 (e.g., with epoxy) and the exposed optical fibers 228 are routed through the fan-out channel 376 and inserted through the openings in the divider 378 .
- the inner fiber optic connectors 230 are mounted to the ends of the optical fibers 228 .
- the cable assembly is inserted downwardly through the open back side of the front piece 208 so that the shrink-fit tube 340 fits within the clamping portion 330 of the cable port 220 , the sealing member 352 seats within the pocket 350 and the first and second interlock tabs 366 , 368 fit within the interlock receptacle 370 of the front piece 208 (see FIG. 19 ).
- the optical fibers 228 are then routed in a looped fashion within the interior of the front piece 208 and the inner fiber optic connectors 230 are inserted into the inner ports 218 of the fiber optic adapters 214 .
- Fibers routed to a first side 430 of the front piece 208 are looped in a clockwise route while fibers routed to a second side 432 of the front piece 208 are routed in a counterclockwise loop route (see FIGS. 19 and 20 ). Thereafter, the inner liner 232 is inserted into the back side of the front piece 208 to contain the optical fibers within the interior of the front piece 208 (see FIGS. 5 and 6 ). The gasket 211 is then inserted into a recess or groove 213 provided about a perimeter of the front piece 208 . The back piece 210 is then mounted to the front piece 208 by fasteners 212 .
- Tightening of the fasteners causes compression of the gasket 211 which provides an outer seal that surrounds the interior 209 of the main housing 202 . Tightening of the fasteners also compresses the sealing member 352 to seal the cable port 220 and causes compression of the shrink-fit tube 340 between the front and back clamp members 332 , 334 to provide further retention of the fiber optic cable 222 .
- the main housing 202 and the anchor block 224 have a molded plastic construction. However, other materials could also be used.
Abstract
The drop terminal includes a plurality of fiber optic adapters having outer connector ports that are accessible from outside the drop terminal. The drop terminal receives a fiber optic cable having a plurality of optical fibers. Fiber optic connectors are positioned at the ends of the optical fibers. The fiber optic connectors are inserted into inner connector ports of the fiber optic adapters. The drop terminal also includes an anchor block for securing the fiber optic cable to a main housing of the drop terminal. The anchor block can be secured to the main housing of the drop terminal by a mechanical interlock. The drop terminal may also include a transparent interior shield or liner that retains fibers in position within the drop terminal during assembly of the drop terminal.
Description
- The present application is a continuation of U.S. patent application Ser. No. 12/411,125, filed Mar. 25, 2009, which is a continuation of U.S. patent application Ser. No. 11/728,043, filed Mar. 23, 2007, now U.S. Pat. No. 7,512,304, which applications/patents are hereby incorporated by reference in their entireties.
- The present disclosure relates to fiber optic cable telecommunication systems. More particularly, the present disclosure relates to drop terminals used in fiber optic cable telecommunication systems.
- Fiber optic cables are widely used to transmit light signals for high speed data transmission. A fiber optic cable typically includes: (1) an optical fiber or optical fibers; (2) a buffer or buffers that surrounds the fiber or fibers; (3) a strength layer that surrounds the buffer or buffers; and (4) an outer jacket. Optical fibers function to carry optical signals. A typical optical fiber includes an inner core surrounded by a cladding that is covered by a coating. Buffers (e.g., loose or tight buffer tubes) typically function to surround and protect coated optical fibers. Strength layers add mechanical strength to fiber optic cables to protect the internal optical fibers against stresses applied to the cables during installation and thereafter. Example strength layers include aramid yarn, steel and epoxy reinforced glass roving. Outer jackets provide protection against damage caused by crushing, abrasions, and other physical damage. Outer jackets also provide protection against chemical damage (e.g., ozone, alkali, acids).
- Fiber optic cable connection systems are used to facilitate connecting and disconnecting fiber optic cables in the field without requiring a splice. A typical fiber optic cable connection system for interconnecting two fiber optic cables includes fiber optic connectors mounted at the ends of the fiber optic cables, and an adapter for mechanically and optically coupling the fiber optic connectors together. Fiber optic connectors generally include ferrules that support the ends of the optical fibers of the fiber optic cables. The end faces of the ferrules are typically polished and are often angled. The adapter includes co-axially aligned ports (i.e., receptacles) for receiving the fiber optic connectors desired to be interconnected. The adapter includes an internal sleeve that receives and aligns the ferrules of the fiber optic connectors when the connectors are inserted within the ports of the adapter. With the ferrules and their associated fibers aligned within the sleeve of the adapter, a fiber optic signal can pass from one fiber to the next. The adapter also typically has a mechanical fastening arrangement (e.g., a snap-fit arrangement) for mechanically retaining the fiber optic connectors within the adapter. One example of an existing fiber optic connection system is described in U.S. Pat. Nos. 6,579,014, 6,648,520, and 6,899,467.
- Fiber optic telecommunication technology is becoming prevalent in part because service providers want to deliver high bandwidth communication capabilities to subscribers. One such technology is referred to as passive optical networks (PONS). PONS may use optical fibers deployed between a service provider central office, or head end, and one or more end user premises. A service provider may employ a central office, or head end, containing electronic equipment for placing signals onto optical fibers running to user premises. End user premises may employ equipment for receiving optical signals from the optical fibers. In PONS, the central office, or head end, transmission equipment and/or the transmission equipment located at the end user premises may, respectively, use a laser to inject data onto a fiber in a manner that may not require the use of any active components, such as amplifiers between the central office, or head end, and/or the end user premises. In other words, only passive optical components, such as splitters, optical fibers, connectors and/or splices, may be used between a service provider and an end user premises in PONS. PONS may be attractive to service providers because passive networks may be less costly to maintain and/or operate as compared to active optical networks and/or older copper based networks, such as a public switched telephone network (PSTN). In addition to possibly being less expensive than other network topologies, PONS may provide sufficient bandwidth to meet a majority of end users' high bandwidth communication needs into the foreseeable future.
- In PONS, transmission equipment may transmit signals containing voice, data and/or video over a fiber strand to the premises. An optical fiber may be split using, for example, passive optical splitters so that signals are dispersed from one fiber (the input fiber) to multiple output fibers running to, for example, user premises from a convergence point in the network. An optical fiber routed to a user's premises may be routed via a fiber drop terminal en route to the premises. At the fiber drop terminal, signals appearing on one or more optical fibers may be routed to one or more end user premises. Fiber drop terminals may be mounted in aerial applications, such as near the tops of utility poles, along multi-fiber and/or multi-conductor copper strands suspended between utility poles. Fiber drop terminals may also be installed in junction boxes mounted at ground level and/or in below-grade vaults where utilities are run below ground. Example fiber drop terminals are disclosed at U.S. Pat. No. 7,120,347; U.S. Patent Publication No. US 2005/0213921; and U.S. Patent Publication No. US 2006/0153517.
- One aspect of the present disclosure relates to a drop terminal for use in a fiber optic telecommunication network. The drop terminal includes a plurality of fiber optic adapters having outer connector ports that are accessible from outside the drop terminal. The drop terminal receives a fiber optic cable having a plurality of optical fibers. Fiber optic connectors are positioned at the ends of the optical fibers. The fiber optic connectors are inserted into inner connector ports of the fiber optic adapters. The drop terminal also includes an anchor block for securing the fiber optic cable to a main housing of the drop terminal. The anchor block can be secured to the main housing of the drop terminal by a mechanical interlock.
- Another aspect of the present disclosure relates to a drop terminal having a transparent interior shield or liner that retains fibers in position within the drop terminal during assembly of the drop terminal.
- A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.
-
FIG. 1 shows a fiber optic network into which drop terminals in accordance with the principles of the present disclosure can be incorporated; -
FIG. 2 is a perspective view of a drop terminal having features that are examples of inventive aspects in accordance with the principles of the present disclosure; -
FIG. 3 is a front view of the drop terminal ofFIG. 2 ; -
FIG. 4 is a side view of a drop terminal ofFIG. 2 ; -
FIG. 5 is an exploded, rear view of the drop terminal ofFIG. 2 ; -
FIG. 6 is a rear, perspective view of the drop terminal ofFIG. 2 with a rear piece of the drop terminal removed and a liner of the drop terminal exploded to show an interior of the drop terminal; -
FIG. 7 is a perspective view of a front side of a back piece of a housing of the drop terminal ofFIG. 2 ; -
FIG. 8 is a plan view of the front side of the back piece ofFIG. 7 ; -
FIG. 9 is a cross-sectional view taken along section line 9-9 ofFIG. 2 ; -
FIG. 10 is a top, perspective view of a cable anchor block incorporated within the drop terminal ofFIG. 2 ; -
FIG. 11 is a top, plan view of the cable anchor block ofFIG. 10 ; -
FIG. 12 is a bottom, plan view of the cable anchor block ofFIG. 10 ; -
FIG. 13 is a cross-sectional view taken along section line 13-13 ofFIG. 11 ; -
FIG. 14 is a perspective view of the fiber management liner of the drop terminal ofFIG. 2 ; and -
FIG. 15 is an exploded view of a fiber optic adapter of the drop terminal ofFIG. 2 ; -
FIG. 16 is a cross-sectional view cut lengthwise through the fiber optic adapter ofFIG. 15 ; -
FIGS. 17-21 show a sequence of steps for securing an optical cable to the drop terminal ofFIG. 2 and for routing fiber within the drop terminal ofFIG. 2 ; and -
FIG. 22 shows a fiber optic connector mounted to a drop cable adapted to be interconnected with the drop terminal ofFIG. 2 . -
FIG. 1 illustrates an exemplary passiveoptical network 100 adapted to provide fiber-to-the-premises (FTTP). As shown inFIG. 1 , theoptical network 100 may include acentral office 110 that connects a number of end subscriber locations 115 (also calledend user locations 115 herein) in a network. Thecentral office 110 may additionally connect to a larger network, such as the Internet (not shown) or a public switched telephone network. The various lines of the network can be aerial or housed within underground conduits (e.g., see conduit 105). - In general, the
optical network 100 includes feeder cables (e.g., main cable 120) associated at one end with thecentral office 110 and from which distribution cables branch. Themain cable 120 may have on the order of 12 to 48 fibers; however, alternative implementations may include fewer or more fibers. - The
optical network 100 may include fiber distribution hubs (FDHs) 130 that receive fibers of thefeeder cable 120 extending fromsplice locations 125 and that output one ormore distribution cables 122. In general, anFDH 130 is an equipment enclosure that may include a plurality of optical splitters (e.g., 1-to-8 splitters, 1-to-16 splitters, or 1-to-32 splitters) for splitting the incoming fibers of thefeeder cable 120 into a number (e.g., 216 to 432) of output distribution fibers. Thedistribution cable 122 extends from anFDH 130 to a number ofend user locations 115. - The
optical network 100 typically includesbreakout locations 116 at which branch cables (e.g., drop cables, stub cables, etc.) 124 are separated out from or electrically coupled (e.g., spliced, connectorized, etc.) todistribution cables 122.Stub cables 124 are typically routed frombreakout locations 116 tointermediate access locations 104 such as a pedestals, drop terminals, or hubs.Intermediate access locations 104 can provide connector interfaces located betweenbreakout locations 116 and theend user locations 115. Drop cables are cables that typically form the last leg to anend user location 115. For example, drop cables can be routed fromintermediate access locations 104 toend user locations 115. Drop cables also can be routed directly frombreakout locations 116 toend user locations 115, thereby bypassing anyintermediate access locations 104. - In certain embodiments,
branch cables 124 can be coupled todistribution cables 122 using factory integrated terminations to provide environmentally sound and cost effective splicing protection. Factory integrated terminations may use factory integrated access (tap) points at specified points, such as atbreakout locations 116, in theoptical network 100 instead of manually installed splices. These factory integrated access points may be connectorized to provide a simple plug and play approach in the distribution portion of theoptical network 100 when connectingend user locations 115 to theoptical network 100. For example, implementations consistent with the principles of the invention may use rugged Outside Plant (OSP) connectors that can accommodate single or multi-port connectors. -
FIGS. 2-6 show adrop terminal 200 having features that are examples of inventive aspects in accordance with the principles of the present disclosure. Thedrop terminal 200 is adapted for use within a fiber optic network. For example, thedrop terminal 200 can be used at a location such as anintermediate access location 104 shown atFIG. 1 . - Referring still to
FIGS. 2-6 , thedrop terminal 200 includes amain housing 202 having a centrallongitudinal axis 201 that extends from afirst end 204 to asecond end 206 of themain housing 202. Themain housing 202 includes afront piece 208 and aback piece 210 that cooperate to define an enclosed interior 209 (seeFIG. 5 ) of themain housing 202. The front andback pieces main housing 202. The front andback pieces central axis 201 so as to extend generally from thefirst end 204 to thesecond end 206 of themain housing 202. Thedrop terminal 200 also includesfiber optic adapters 214 mounted to thefront piece 208 of themain housing 202. Thefiber optic adapters 214 each include an outer port 216 (seeFIGS. 2 and 16 ) accessible from outside themain housing 202 and an inner port 218 (seeFIGS. 6 and 16 ) accessible from within themain housing 202. Thesecond end 206 of themain housing 202 defines acable port 220 for allowing afiber optic cable 222 to enter/exit theinterior 209 of themain housing 202. - Referring to
FIG. 6 , thedrop terminal 200 also includes ananchor block 224 for use in mechanically securing thefiber optic cable 222 to themain housing 202. Theanchor block 224 includes a fan-outportion 226 that fans-out/spreads-apartoptical fibers 228 of thefiber optic cable 222 that are routed and managed within theinterior 209 of themain housing 202. An inner fiber optic connector 230 (seeFIG. 6 ) is mounted at the end of each of theoptical fibers 228. The innerfiber optic connectors 230 are inserted within theinner ports 218 of thefiber optic adapters 214. Thedrop terminal 200 also includes an inner liner 232 (i.e., a fiber protector or shield) (seeFIGS. 5 and 6 ) that mounts within themain housing 202 and functions to hold or contain theoptical fibers 228 within the interior of thefront piece 208 during attachment of theback piece 210 to thefront piece 208. Thedrop terminal 200 further includes a gasket 211 (seeFIG. 5 ) mounted between the front andback pieces main housing 202. Thegasket 211 extends around the perimeter or periphery of themain housing 202 and prevents moisture from entering the interior of the assembledmain housing 202. - In use, the
drop terminal 200 can be installed at a location such as one of theintermediate access locations 104 of theoptical network 100 ofFIG. 1 . For such an application, thefiber optic cable 222 is a stub cable routed from a breakout location of a distribution cable, and thedrop terminal 200 provides connection locations for connecting subscriber locations to the fiber optic network. For example, thedrop terminal 200 can provide easily accessible locations for connecting drop cables to the fiber optic network. In one embodiment, first ends of the drop cables can be plugged intoouter ports 216 of thefiber optic adapters 214, and second ends of the drop cables can be plugged into network interface devices at subscriber locations. - The
optical fibers 228 of thefiber optic cable 222 are adapted to carry/convey optical signals. Theoptical fibers 228 can each include a core surrounded by cladding. The core is the light-conducting central portion of theoptical fiber 228. The cladding surrounds the core and is composed of a material having a lower index of refraction than the material of the core. Light is internally reflected within the core to transmit the optical signal along the core. As shown atFIG. 9 , theoptical fibers 228 are contained within acentral buffer tube 300 of thefiber optic cable 222. Thefiber optic cable 222 also includes strength members 302 (e.g., epoxy reinforced glass roving, aramid yarn, metal reinforcing members, or other reinforcing structure) positioned on opposite sides of thecentral buffer tube 300 for providing the cable with increased tensile strength. Thestrength members 302 and thecentral buffer tube 300 are positioned within anouter jacket 304 of thefiber optic cable 222. - Referring now to
FIGS. 2-4 , themain housing 202 of thedrop terminal 200 includes a length L and a width W. The length L is parallel to the centrallongitudinal axis 201 of themain housing 202. First, second and third rows 306 1-306 3 offiber optic adapters 214 are mounted to thefront piece 208 of themain housing 202. Each of rows 306 1-306 3 includes fourfiber optic adapters 214 spaced-apart across the width W of themain housing 202. The first row 306 1 is located closest thefirst end 204 of themain housing 202, the third row 306 3 is located closest thesecond end 206 of themain housing 202 and the second row 306 2 is located between the first and third rows 306 1, 306 3. The front face of thefront piece 208 has a stepped configuration with three steps 310 1-310 3 positioned consecutively along the length L of themain housing 202. Each step 310 1-310 3 includes an adapter mounting wall 262 1-262 3 defining adapter mounting openings 258 (seeFIG. 16 ) in which thefiber optic adapters 214 are mounted. As shown atFIG. 4 , the adapter mounting walls 262 1-262 3 are generally parallel to one another and are spaced apart along the length L of themain housing 202. The adapter mounting walls 262 1-262 3 have front faces that are aligned at an oblique angle θ1 relative to a plane P that extends through the center axis of thefiber optic cable 222 and across the width W of themain housing 202. The angled configuration of the adapter mounting walls 262 causes thefiber optic adapters 214 to be angled relative to the plane P. For example, center axes 252 of thefiber optic adapters 214 are shown aligned at an oblique angle θ2 relative to the plane. In this way, theouter ports 216 of thefiber optic adapters 214 face generally in the same direction that thefiber optic cable 222 enters/exits thedrop terminal 200. - The
main housing 202 includes first andsecond end portions gasket 211. The first andsecond end portions drop terminal 200 to another structure (e.g., a wall, a pole, etc.). The openings includelarge fastener openings 504 for receiving large fasteners (e.g., lag bolts),smaller fastener openings 506 for receiving smaller fasteners (e.g., screws) andstrap openings 508 for receiving fastening straps. - The
cable port 220 of thedrop terminal 200 is defined in part by thefront piece 208 of themain housing 202 and in part by theback piece 210 of themain housing 202. As shown atFIG. 21 , thecable port 220 has acurved end portion 322 that is configured to provide bend radius protection to thefiber optic cable 222. Thecurved end portion 322 flares/transitions radially outwardly from a center axis of thecable port 220 as the curved portion extends away from the interior of themain housing 202 to generally form a rounded bell-mouth at the outer end of thecable port 220. - Referring to
FIGS. 2 , 5 and 17, a clampingportion 330 of thecable port 220 is defined between afront clamp member 332 and aback clamp member 334. Thefront clamp member 332 is integral with thefront piece 208 of themain housing 202 and theback clamp member 334 is integral with theback piece 210 of themain housing 202. As shown atFIG. 17 , the surface defining the clampingportion 330 ofcable port 220 includes gripping structure 335 (e.g., structures such as ribs, projections, or knurling) to facilitate gripping thefiber optic cable 222 when thefiber optic cable 222 is clamped between the front andback clamp members FIGS. 18 and 19 ) can be positioned about thefiber optic cable 222 within the clampingportion 330 to further provide enhanced gripping of thefiber optic cable 222. - The front and
back clamp members FIG. 3 ). Thefasteners 212 c are positioned on opposite sides of the clampingportion 330 of thecable port 220. - The
cable port 220 further includes a pocket 350 (seeFIG. 18 ) positioned between the clampingportion 330 and theinterior 209 of themain housing 202. Thepocket 350 is sized to receive a sealing member 352 (e.g., a resilient sealing member such as a rubber grommet) mounted on about the exterior of thefiber optic cable 222. When mounted in thepocket 350, the sealingmember 352 underlies thegasket 211 that surrounds the perimeter of themain housing 202 of thedrop terminal 200. When the front andback pieces main housing 202 are fastened together, the sealingmember 352 is compressed within thepocket 350 to provide a seal between theouter jacket 304 of thefiber optic cable 222 and themain housing 202 of thedrop terminal 200. - The
fiber optic cable 222 is further secured to thedrop terminal 200 by a mechanical interlock. For example, thefiber optic cable 222 can be secured to the anchor block 224 (seeFIGS. 6 and 18 ) that is then inserted into and interlocked with themain housing 202 so that axial movement of thefiber optic cable 222 relative to themain housing 202 is resisted. Referring toFIGS. 10-12 , theanchor block 224 includes amain body 360 that extends from afirst end 362 to asecond end 364 of theanchor block 224. Themain body 360 is elongated along acenter axis 361 of theanchor block 224. Thesecond end 364 of theanchor block 224 is configured to mechanically interlock with themain housing 202 of thedrop terminal 200. For example, thesecond end 264 includes first andsecond interlock tabs main body 360 in opposite directions relative to thecenter axis 361. The first andsecond interlock tabs FIG. 21 ) provided within the interior of thefront piece 208 adjacent thesecond end 206 of themain housing 202. The first andsecond interlock tabs interlock receptacle 370 by moving theanchor block 224 in an insertion direction I (seeFIG. 18 ) that is transverse to acentral axis 221 of thefiber optic cable 222. Thus, when the first andsecond interlock tabs interlock receptacle 370, interference between the first andsecond interlock tabs interlock receptacle 370 resists movement of theanchor block 224 in a direction along thecentral axis 221 of thefiber optic cable 222. It will be appreciated that when theanchor block 224 is interlocked with theinterlock receptacle 370, thecenter axis 361 of theanchor block 224 is coaxially aligned with thecentral axis 221 of thefiber optic cable 222. - Referring to
FIGS. 7 and 8 , the front side of theback piece 210 of themain housing 202 includes a pair of forwardly projectingposts 600. When thedrop terminal 200 is assembled, theposts 600 engage themain body 360 of theanchor block 224 to assist in retaining thefirst end 264 of themain body 360 within theinterlock receptacle 370. - In the preferred embodiment the
anchor block 224 is secured to themain housing 202 by a mechanical interlock. However, in alternative embodiments, alternate retention techniques (e.g., fasteners, adhesive, etc.) could also be used. - Referring to
FIGS. 10-13 , theanchor block 224 also includes structure for securing thefiber optic cable 222 to themain body 360 of theanchor block 224. For example, thesecond end 364 includes acentral groove 372 for receiving thecentral buffer tube 300 of thefiber optic cable 222. Thesecond end 364 also includes twoside grooves 374 that are parallel to thecentral groove 372 and positioned on opposite sides of thecentral groove 372. Theside grooves 374 are sized to receive thestrength members 302 of thefiber optic cable 222. By placing thestrength members 302 in theside grooves 374 and thecentral buffer tube 300 in thecentral groove 372, and then applying a securing material (e.g., an adhesive such as epoxy) to thegrooves fiber optic cable 222 is secured to theanchor block 224. - The
anchor block 224 also includes the fan-outportion 226 for spreading/fanning-out theoptical fibers 228 of thefiber optic cable 222. For example, as shown atFIGS. 10 and 11 , theanchor block 224 includes a fan-outchannel 376 that extends from thecentral groove 372 to thefirst end 362 of themain body 360 of theanchor block 224. The fan-outchannel 376 has a width Wi that gradually widens as the fan-outchannel 376 extends along thecenter axis 361 from thecentral groove 372 to thefirst end 362 of theanchor block 224. A divider 378 (seeFIG. 10 ) is located within the fan-outchannel 376 at thefirst end 362 of theanchor block 224. Thedivider 378 includes a plurality ofopenings 380 that individually receive theoptical fibers 228 to maintain separation of theoptical fibers 228. In practice, theoptical fibers 228 extend from the end of thecentral buffer tube 300 through the fan-outchannel 376 to thedivider 378. At the divider, theoptical fibers 228 each extend through one of the openings of thedivider 378. The tapered configuration of the fan-outchannel 376 allows theoptical fibers 228 to spread apart as theoptical fibers 228 extend from the end of thecentral buffer tube 300 at thecentral groove 372 to thedivider 378. A securing material (e.g., an adhesive such as epoxy) can be used to fill the fan-outchannel 376 after theoptical fibers 228 have been positioned therein to maintain position of theoptical fibers 228. - Referring to
FIGS. 5 , 6 and 14, theinner liner 232 of thedrop terminal 200 includes a generally rectangularmain wall 400 having a width W2 sized to extend generally across the width W of themain housing 202, and a length L2 sized to extend along a majority of the length L of themain housing 202. Theinner liner 232 also includes two opposingside walls 402 positioned at opposite sides of the width W2 that project outwardly from themain wall 400 and extend along the length L2 of themain wall 400. Theinner liner 232 further includes anend wall 403 that projects outwardly from themain wall 400 at one end of themain wall 400, and atab 404. Thetab 404 is shown generally parallel to themain wall 400, while theside walls 402 and theend wall 403 are depicted as being generally perpendicular relative to themain wall 400. Theinner liner 232 further includescorner notches 406 positioned on opposite sides of theend wall 403. - In one embodiment, the
inner liner 232 is constructed of a sheet of transparent plastic material. In such an embodiment, the side walls connect to themain wall 400 at fold lines 407. Also,end wall 403 connects to themain wall 400 atfold line 409 andtab 404 connects to endwall 403 atfold line 411. Serrations can be provided at the fold lines to facilitate making the folds. - As shown in
FIGS. 5 and 6 , themain wall 400 of theinner liner 232 is configured to cover a majority of an open back side of thefront piece 208 of themain housing 202. When positioned in thefront piece 208, themain wall 400 covers the open back side of thefront piece 208, and theside walls 402 project forwardly into the interior of thefront piece 208. Theside walls 402 can have a depth D sized such that the ends of the side walls rest on the back portions 311 1-311 3 of the steps 310 1-310 3 when theinner liner 232 is mounted within thefront piece 208. Similarly, theend wall 403 is sized such that thetab 404 rests against the back side of the front wall of thefront piece 208. When theinner liner 232 is positioned within thefront piece 208, theinner liner 232 functions to retain theoptical fibers 228 within the boundaries defined about the perimeter of thefront piece 208. In this way, theoptical fibers 228 are prevented from becoming pinched between thefront piece 208 and theback piece 210 during assembly of themain housing 202. Because theinner liner 232 is transparent, the assembler can view theoptical fibers 228 through theinner liner 232 to confirm that theoptical fibers 228 are routed properly. Thecorner notches 406 provide clearance for accommodating the rounded inner corners defined within the interior of thefront piece 208 adjacent thefront end 204 of themain housing 202. -
FIG. 15 illustrates one of thefiber optic adapters 214 in isolation from themain housing 202 of thedrop terminal 200. Thefiber optic adapter 214 includes amain housing 240 having afirst piece 242 that defines theinner port 218 of thefiber optic adapter 214 and asecond piece 244 that defines theouter port 216 of thefiber optic adapter 214. The first andsecond pieces main housing 240. Asplit sleeve housing 246 mounts within the interior of themain housing 240.Springs 248 bias thesplit sleeve housing 246 toward theouter port 216 and allow thesplit sleeve housing 246 to float within the interior of themain housing 240. As shown inFIG. 16 , thesplit sleeve housing 246 houses astandard split sleeve 250 that is coaxially aligned with acenter axis 252 of thefiber optic adapter 214. Thesplit sleeve 250 includes afirst end 254 that faces toward theinner port 218 of thefiber optic adapter 214 and asecond end 256 that faces toward theouter port 216 of thefiber optic adapter 214. Thefiber optic adapter 214 mounts within one of theadapter mounting openings 258 defined by thefront piece 208 of themain housing 202. Thefiber optic adapter 214 is retained within theadapter mounting opening 258 by aretention nut 260 threaded on exterior threads defined by thefirst piece 242 of themain housing 240. When theretention nut 260 is threaded into place, the corresponding adapter mounting wall 262 1 of thefront piece 208 is captured between theretention nut 260 and ashoulder 264 of themain housing 202. A sealingmember 266 is compressed between themain housing 240 and the adapter mounting wall 262 to provide an environmental seal about theadapter mounting opening 258. - As shown in
FIG. 16 , adust cap 268 is shown mounted covering theinner port 218 of thefiber optic adapter 214 and aplug 270 is shown mounted within theouter port 216 of thefiber optic adapter 214. Theplug 270 is threaded withininternal threads 272 defined within theouter port 216. Theplug 270 also includes a sealing member 274 (e.g., an O-ring) that engages a sealingsurface 276 within theouter port 216 to provide an environmental seal between themain housing 240 and theplug 270. Astrap 278 secures theplug 270 to themain housing 240 to prevent the plug from being misplaced when removed from theouter port 216. - During assembly of the
drop terminal 200, thefiber optic adapters 214 are mounted within theadapter mounting openings 258 defined through thefront piece 208 of themain housing 202. After installation of thefiber optic adapters 214, the dust caps 268 can be removed to allow the innerfiber optic connectors 230 terminated to theoptical fibers 228 to be inserted into theinner ports 218. When the innerfiber optic connectors 230 are inserted into theinner ports 218, ferrules of the innerfiber optic connectors 230 are received within the first ends 254 of thesplit sleeves 250, and clips 280 function to retain the innerfiber optic connectors 230 within theinner ports 218. - When it is desired to optically couple a drop cable to the
drop terminal 200, theplug 270 of one of thefiber optic adapters 214 is removed from its correspondingouter port 216 to allow an exterior fiber optic connector terminated to the drop cable to be inserted into theouter port 216. An example exteriorfiber optic connector 282 mounted at the end of adrop cable 290 is shown atFIG. 22 . The exteriorfiber optic connector 282 includes ahousing 284 on which aretention nut 286 is rotatably mounted. Theretention nut 286 can be manually rotated about acentral axis 288 of the exteriorfiber optic connector 282. Thedrop cable 290 includes anoptical fiber 292 having an end portion mounted within aferrule 294 supported at one end of thehousing 284. When the exteriorfiber optic connector 282 is inserted within theouter port 216, theferrule 294 is received withinsecond end 256 of thesplit sleeve 250. In this way, thesplit sleeve 250 holds the ferrule of the innerfiber optic connector 230 in coaxial alignment with theferrule 294 of the exteriorfiber optic connector 282. By aligning the ferrules, the correspondingoptical fibers fiber optic connector 282 is retained within theouter port 216 by threading theretention nut 286 into theinternal threads 272. Additionally, the exteriorfiber optic connector 282 includes a sealing member 296 (e.g., an O-ring) that engages the sealingsurface 276 to provide an environmental seal between the exteriorfiber optic connector 282 and thefiber optic adapter 214. With the ends of theoptical fibers optical fibers - To assemble the
drop terminal 200, thefiber optic adapters 214 are first mounted within theadapter mounting openings 258 defined by thefront piece 208. The dust caps 268 are then removed from thefiber optic adapters 214 to provide access to the inner ports 218 (seeFIG. 17 ). Thefiber optic cable 222 is then prepared by stripping away an end portion of theouter jacket 304 and trimming back thecentral buffer tube 300 andstrength members 302 to expose theoptical fibers 228. The shrink-fit tube 340 and sealingmember 352 are then mounted about the exterior of theouter jacket 304 of thefiber optic cable 222. Thereafter, the exposedcentral buffer tube 300 andstrength members 302 are bonded to the anchor block 224 (e.g., with epoxy) and the exposedoptical fibers 228 are routed through the fan-outchannel 376 and inserted through the openings in thedivider 378. Next, the innerfiber optic connectors 230 are mounted to the ends of theoptical fibers 228. To secure the cable assembly to themain housing 202, the cable assembly is inserted downwardly through the open back side of thefront piece 208 so that the shrink-fit tube 340 fits within the clampingportion 330 of thecable port 220, the sealingmember 352 seats within thepocket 350 and the first andsecond interlock tabs interlock receptacle 370 of the front piece 208 (seeFIG. 19 ). Theoptical fibers 228 are then routed in a looped fashion within the interior of thefront piece 208 and the innerfiber optic connectors 230 are inserted into theinner ports 218 of thefiber optic adapters 214. Fibers routed to afirst side 430 of thefront piece 208 are looped in a clockwise route while fibers routed to asecond side 432 of thefront piece 208 are routed in a counterclockwise loop route (seeFIGS. 19 and 20 ). Thereafter, theinner liner 232 is inserted into the back side of thefront piece 208 to contain the optical fibers within the interior of the front piece 208 (seeFIGS. 5 and 6 ). Thegasket 211 is then inserted into a recess or groove 213 provided about a perimeter of thefront piece 208. Theback piece 210 is then mounted to thefront piece 208 byfasteners 212. Tightening of the fasteners causes compression of thegasket 211 which provides an outer seal that surrounds theinterior 209 of themain housing 202. Tightening of the fasteners also compresses the sealingmember 352 to seal thecable port 220 and causes compression of the shrink-fit tube 340 between the front andback clamp members fiber optic cable 222. - In a preferred embodiment, the
main housing 202 and theanchor block 224 have a molded plastic construction. However, other materials could also be used. - From the forgoing detailed description, it will be evident that modifications and variations can be made in the devices of the disclosure without departing from the spirit or scope of the invention.
Claims (21)
1. (canceled)
2. An anchor block to secure an optical fiber cable to a surface, the anchor block comprising:
a body extending along a longitudinal axis from a first end to a second end, the body defining a central groove extending along the longitudinal axis of the body, a first side groove at one side of the central groove, and a second side groove at an opposite side of the central groove, the central groove leading to a fanout channel that tapers outwardly along the longitudinal axis of the body towards the first end of the body; and
a plurality of interlock tabs disposed at the second end of the body, each of the interlock tabs projecting outwardly away from the longitudinal axis the body, each of the interlock tabs defining an abutment surface facing towards the first end of the body.
3. The anchor block of claim 2 , wherein the interlock tabs are integral with the body.
4. The anchor block of claim 2 , wherein a cross-dimension of the body at the interlock tabs is wider than a cross-dimension of the body at any other location along the longitudinal axis of the body.
5. The anchor block of claim 2 , wherein the first and second side grooves extend parallel to the central groove.
6. The anchor block of claim 2 , wherein the first and second side grooves abut the central groove.
7. The anchor block of claim 2 , wherein the first and second side grooves are sized to receive strength members of the optical fiber cable.
8. The anchor block of claim 2 , wherein the central groove is sized to receive a central buffer tube of the optical fiber cable.
9. The anchor block of claim 2 , further comprising a divider that is configured to be positioned at the first end of the body, the divider being configured to individually receive a plurality of optical fibers of the optical fiber cable.
10. The anchor block of claim 9 , wherein the divider defines a plurality of holes, each hole being configured to receive one of the optical fibers of the optical fiber cable.
11. The anchor block of claim 9 , wherein a securing material is disposed in the fanout channel after the optical fibers are received by the divider.
12. A mechanical interlock arrangement that secures an optical cable to a surface, the mechanical interlock arrangement comprising:
a receptacle structure disposed at the surface, the receptacle structure defining a first receptacle and a second receptacle that are accessible along an insertion direction; and
an anchor block extending along a longitudinal axis from a first end to a second end, the second end including a first interlock tab and a second interlock tab that extend outwardly from the anchor block in opposite directions, the interlock tabs being sized and configured to be received in the interlock receptacles along the insertion direction, which is orthogonal to the longitudinal axis of the anchor block, the anchor block being configured to fixedly receive strength members of the optical cable and to separate out optical fibers of the optical cable so that individual ones of the optical fibers extend out from the first end of the anchor block.
13. The mechanical interlock arrangement of claim 12 , wherein the forms part of an interior surface of an enclosure.
14. The mechanical interlock arrangement of claim 13 , wherein the enclosure forms a drop terminal including adapters.
15. The mechanical interlock arrangement of claim 12 , wherein the anchor block defines a central groove extending along the longitudinal axis of the anchor block, the central groove being sized to receive a buffer tube of the optical cable.
16. The mechanical interlock arrangement of claim 15 , wherein the anchor block defines a plurality of side grooves at which the strength members can be fixed with adhesive.
17. The mechanical interlock arrangement of claim 16 , wherein the central groove and side grooves are recessed inwardly from the second end of the anchor block.
18. The mechanical interlock arrangement of claim 17 , wherein the anchor block defines a jacket receiving channel that extends between the second end of the anchor block and the grooves.
19. The mechanical interlock arrangement of claim 15 , further comprising a divider disposed at the first end of the anchor block, the divider defining holes that receive the individual ones of the optical fibers.
20. The mechanical interlock arrangement of claim 19 , wherein the anchor block defines a fanout channel that extends from the central groove to the divider.
21. The mechanical interlock arrangement of claim 12 , wherein the first and second receptacles align along an axis transverse to the longitudinal axis of the anchor block.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/455,351 US20130022328A1 (en) | 2007-03-23 | 2012-04-25 | Drop Terminal with Anchor Block for Retaining a Stub Cable |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/728,043 US7512304B2 (en) | 2007-03-23 | 2007-03-23 | Drop terminal with anchor block for retaining a stub cable |
US12/411,125 US20090269020A1 (en) | 2007-03-23 | 2009-03-25 | Drop terminal with anchor block for retaining a stub cable |
US13/455,351 US20130022328A1 (en) | 2007-03-23 | 2012-04-25 | Drop Terminal with Anchor Block for Retaining a Stub Cable |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/411,125 Continuation US20090269020A1 (en) | 2007-03-23 | 2009-03-25 | Drop terminal with anchor block for retaining a stub cable |
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Publication Number | Publication Date |
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US20130022328A1 true US20130022328A1 (en) | 2013-01-24 |
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Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/728,043 Active US7512304B2 (en) | 2007-03-23 | 2007-03-23 | Drop terminal with anchor block for retaining a stub cable |
US12/411,125 Abandoned US20090269020A1 (en) | 2007-03-23 | 2009-03-25 | Drop terminal with anchor block for retaining a stub cable |
US12/851,177 Abandoned US20100303433A1 (en) | 2007-03-23 | 2010-08-05 | Drop terminal with anchor block for retaining a stub cable |
US13/455,351 Abandoned US20130022328A1 (en) | 2007-03-23 | 2012-04-25 | Drop Terminal with Anchor Block for Retaining a Stub Cable |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
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US11/728,043 Active US7512304B2 (en) | 2007-03-23 | 2007-03-23 | Drop terminal with anchor block for retaining a stub cable |
US12/411,125 Abandoned US20090269020A1 (en) | 2007-03-23 | 2009-03-25 | Drop terminal with anchor block for retaining a stub cable |
US12/851,177 Abandoned US20100303433A1 (en) | 2007-03-23 | 2010-08-05 | Drop terminal with anchor block for retaining a stub cable |
Country Status (5)
Country | Link |
---|---|
US (4) | US7512304B2 (en) |
EP (1) | EP2130078B1 (en) |
CN (1) | CN101669057B (en) |
ES (1) | ES2736152T3 (en) |
WO (1) | WO2008118603A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20080232743A1 (en) | 2008-09-25 |
US20100303433A1 (en) | 2010-12-02 |
CN101669057A (en) | 2010-03-10 |
EP2130078B1 (en) | 2019-06-12 |
WO2008118603A3 (en) | 2008-12-31 |
US7512304B2 (en) | 2009-03-31 |
US20090269020A1 (en) | 2009-10-29 |
ES2736152T3 (en) | 2019-12-26 |
CN101669057B (en) | 2013-11-06 |
WO2008118603A2 (en) | 2008-10-02 |
EP2130078A2 (en) | 2009-12-09 |
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