CA2519596A1 - Optical fiber interconnect cabinet - Google Patents

Abstract

Interconnect cabinets (100) for optical fibers include an enclosure and a splitter (140) and termination panel (130) mounted in the enclosure. The splitter has a plurality of optical fiber connectorized pigtails (150) extending therefrom. Each of the connectorized pigtails is associated with an optical fiber feeder cable (110) to be coupled to a central office. The termination panel has a plurality of optical fiber connection members (120), ones of which are associated with respective subscriber locations. The connectorized pigtails have a cable length sufficient to allow connection to the plurality of connection members.

Description

OPTICAL FIBER INTERCONNECT CABINETS
RELATED APPLICATIONS
The present application claims priority from U.S. Provisional Application No. 60/456,323, filed March 20, 2003, the disclosure of which is hereby incorporated herein in its entirety by reference.
BACKGROUND OF THE INVENTION
The present invention relates to optical fiber management and, more particularly, to systems for connecting optical fibers.
When providing services using an optical fiber network, it is generally necessary to add and drop subscribers over time. As a result, a variety of methods are provided for interconnecting subscriber locations with a central office connecting facility operated by an optical network provider: To improve the utilization of communication circuits within such a central office facility, interconnection cabinets, such as a centralized splitter cabinet (CSC) and/or centralized splitter cross-connect (CSX), may be provided as part of the outside plant (OSP) infrastructure of the optical fiber network. Doing so may allow some of the burden of establishing and changing connections on the network to be shifted away from the central office and facilitate incremental growth of an installed network as new subscribers are added.
A centralized splitter cabinet (CSC) is typically a passive optical enclosure that provides random termination of optical splitters suitable for use in OSP
environment. A CSC may be pedestal or pole mounted in the field. A CSC may provide a flexibility point for termination of distribution cable as well as enclosing a splitter array. This flexibility in interconnections of the downstream fiber network may facilitate optimization of the use of electronic equipment in the central office by, for example, avoiding the need to dedicate circuits in the central office to each subscriber location when many such locations may not be active.

A field service technician may be sent to the CSC to modify the selection of a subscriber location coupled through a splitter to a particular fiber from the central office by connecting and disconnecting various cables found in the CSC. For example, it is known to provide connectorized pigtail cables associated with each subscriber location serviced by a CSC in the CSC. A technician can then select the cable for a designated subscriber location, for example, based on a label attached to the pigtail, and insert the selected cable in a connection point of a splitter.
Some currently available splitter interconnect cabinets utilize industry standard connectorized bulkhead modules to house splitters. These designs generally do not permit access to the rear of the connector without breaking a warranty seal and are designed for the central office environment. The seal may be critical for the manufacturer to ensure that no damage to the splitter occurs post-manufacturing (in the field). This requirement may be in direct opposition to the cleaning requirement, for which access to the front and back of a connection point may be desired.
SUMMARY OF THE INVENTION
Embodiments of the present invention provide interconnect cabinets for optical fibers that include an enclosure and a splitter and termination panel mounted in the enclosure. The splitter has a plurality of optical fiber connectorized pigtails extending therefrom. Each of the connectorized pigtails is associated with an optical fiber feeder cable to be coupled to a central office. The termination panel has a plurality of optical fiber connection members, ones of which are associated with respective subscriber locations. The connectorized pigtails have a cable length sufficient to allow connection to the plurality of connection members.
In further embodiments of the present invention, the sputter further includes at least one input optical fiber and the splitter is configured to splice the at least one input optical fiber to the plurality of connectorized pigtails. An optical fiber cable from the central office may be coupled to the at least one input optical fiber and optical fiber cables from the subscriber locations may be coupled to the plurality of connection members. The splitter may be an optical fiber splitter tray and the enclosure may be configured to receive a plurality of optical fiber splitter trays andlor a plurality of termination panels. The plurality of connectorized pigtails may have substantially the same. length. The enclosure may be a double-walled housing configured to provide passive cooling.

In other embodiments of the present invention, the termination panel is pivotally mounted in the enclosure to allow access to a front and a back side of the connection members from a front side of the enclosure. The termination panel may be a front panel of a termination module and the termination module may further include a splice chamber configured to mount a plurality of splice modules adjacent a back side of the termination panel. The splice chamber may be pivotally mounted in the enclosure to provide access to the splice chamber from the front side of the enclosure. The termination module may be removably mounted in the enclosure to allow removal of the termination module through the front side of the enclosure. The termination panel and the splice chamber may be pivotally mounted in the enclosure for independent pivotal movement.
In further embodiments of the present invention, the termination module further includes a movable cable securing member configured to receive and secure an optical fiber cable, the cable securing member having a first position aligned with a closed position of the splice chamber and a second position aligned with an open position of the splice chamber. The cable securing member may include an attachment member configured to receive and retain a strength member of the optical fiber cable. The cable securing member may be detachable from the termination module to allow movement between the first position and the second position.
In other embodiments of the present invention, the cable securing member is pivotally attached to the termination module to allow movement between the first position and the second position. The cable securing member may pivot about a neutral axis having an arc length for a cable secured therein that is substantially the same in the first and the second positions to limit loads on the cable secured therein during movement of the cable securing member between the first and second positions.
In further embodiments of the present invention, the cabinet further includes a spooling system mounted in the enclosure and configured to receive and store excess cable length of the plurality of connectorized pigtails. The spooling system may include a plurality of spools displaced from each other in the enclosure by a distance corresponding to a distance between a first and last row of connection members on the termination panel. A distance between a first and a last of the spools may be about half the distance between first and last rows of connection members on the termination panel. The spooling system may also include an initial loop spool configured to receive all the connectorized pigtails and provide the connectorized pigtails a common entry point to the spooling system. The spools may be half moon spools.
In other embodiments of the present invention, optical fiber termination modules include a mounting member adapted to be mounted to an interconnect cabinet for optical fibers. A bulkhead termination panel is pivotally mounted to the mounting member to allow access to a back side of the termination panel covered by the mounting member. A plurality of optical fiber connection members are mounted in the termination panel. The connection members may include a front socket configured to receive a mating optical fiber plug connector and a back socket configured to receive a mating optical fiber plug connector to provide an optical coupling between the mating optical fiber plug connectors received therein.
In further embodiments of the present invention, the termination module includes a splice chamber mounted to the mounting member proximate the back side of the termination panel. The splice chamber is configured to receive at least one splice module. The splice chamber may be pivotally mounted to the mounting member for pivotal movement separately from the termination panel. A front side of the splice chamber may face the termination panel and the at least one splice module may be received on an opposite, back side of the splice chamber. The splice module may be accessible in an open position of the splice chamber. The splice module may be a splice tray.
In other embodiments of the present invention, the termination module includes the splice modules) and a plurality of connectorized pigtails extending from the splice modules) to the connector members on a back side of the termination panel. The splice chamber may also include an optical fiber slack receiving region positioned between the splice modules) and the termination panel. A mounting means may be provided for removably mounting the termination module in an optical fiber interconnect cabinet.
In yet other embodiments of the present invention, configuring an interconnect cabinet for optical fibers for outside plant management of subscriber optical fiber connectivity includes providing a termination panel in the cabinet having a plurality of optical fiber connection points and a splitter in the cabinet having a plurality of optical fiber connectorized pigtails extending therefrom, the connectorized pigtails have a cable length sufficient to allow connection to the plurality of connection points. The connectorized pigtails are optically spliced to an optical fiber feeder cable coupled to a central office. The plurality of optical fiber connection points are optically spliced to respective subscriber locations.
In further embodiments of the present invention, ones of the connectorized pigtails are selectively coupled to ones of the connection points to provide service to designated ones of the subscriber locations. One of the connectorized pigtails may be selectively decoupled from one of the connection points to terminate service for a designated one of the subscriber locations. The cabinet may further include a plurality of fiber management spools and the connectorized pigtails may be routed around selected ones of the fiber management spools based on a location of a connection point to which they are to be coupled. The pigtails may be optically spliced to an optical fiber feeder cable coupled to a central office in a splice closure outside of the interconnect cabinet.
In other embodiments of the present invention, interconnect cabinets for optical fibers include an enclosure and a termination panel mounted in the enclosure and having a plurality of optical fiber connection members, ones of which are associated with respective subscriber locations or are associated with an optical fiber feeder cable to be coupled to a central office. One or more jumper cables are provided for cross-connecting ones of the connection members. A spooling system mounted in the enclosure is configured to receive and store excess cable length of the jumper cable(s). The jumper cables) have a cable length sufficient to allow cross-connecting of the plurality of comiection members. The spooling system may include a plurality of spools displaced from each other in the enclosure by a distance corresponding to a distance between a first and last row of connection members on the termination panel. The spooling system may further include a mid-point spool.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic diagram illustrating an interconnect cabinet for optical fibers according to some embodiments of the present invention;
Figure 2 is a front perspective view of an interconnect cabinet for optical fibers according to some embodiments of the present invention;
Figure 3 is a front perspective view of an interconnect cabinet for optical fibers according to some embodiments of the present invention;

Figure 4 is a perspective view of a termination module according to some embodiments of the present invention with the termination panel in an open position;
Figure 5 is a front perspective view of an interconnect cabinet for optical fibers according to some embodiments of the present invention showing installation of a termination module in the cabinet;
Figure 6a is a perspective view of a termination module according to some embodiments of the present invention in a closed position;
Figure 6b is a perspective view of the termination module of Figure 6a in an open position showing the splice chamber and trays;
Figure 6c is a perspective view of the termination module of Figure 6a in another open position showing the back side of the termination panel;
Figure 7a is a side view of a termination module according to some embodiments of the present invention;
Figure 7b is a front perspective view of the termination module of Figure 7a;
Figure 8 is a side view of the cable securing member of the termination module of Figure 7a according to some embodiments of the present invention;
Figure 9 is a perspective view of an optical fiber splitter/splice tray having a plurality of connectorized pigtails according to some embodiments of the present invention;
Figure 10 is a perspective view of an optical fiber splitter/splice box having a plurality of connectorized pigtails according to some embodiments of the present invention; and Figure 11 is a flowchart illustrating methods for outside plant management of subscriber optical fiber connectivity according to some embodiments of the present invention.
DETAILED DESCRIPTION
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which illustrative embodiments of the invention are shown. In the drawings, the relative sizes of regions or features may be exaggerated for clarity. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein;
rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Some embodiments of he present invention utilize a mufti-layer, fold down tray approach to support various functions, such as slack storage, pigtail to outside plant (OSP) cable splicing and angle down front patching. A termination module according to such embodiments may be designed in a modular fashion so that it can be used separately in a small pedestal or ganged together with other termination modules in a pad (i.e. ground) or pole mounted cabinet. The termination modules may also be pre-terminated to subscriber location optical fibers before mounting in an interconnect cabinet. The termination modules in some embodiments may also be removed from the cabinet and carried to a remote location, such as a splice truck, to facilitate initial installation.
The termination modules in some embodiments include splice trays therein that may be oriented such that they can be worked on remotely or in the cabinet when a repair situation arises. In some embodiments, the entire patching field pivots downward and/or sideways, allowing access to both sides of the connector for cleaning while potentially reducing or avoiding the normal disruption of disconnecting existing subscribers to gain access. Cleaning both sides of an optical connector may be beneficial, particularly when using connectors in the OSP. A
detachable cable security member is incorporated into some embodiments of the termination module of the present invention, which may allow fixation of the cable as well as the central strength member in both an open and closed position of the termination module without placing undue strain on the cable from a change in orientation of the termination module during installation or the like.
The cable security member of some embodiments of the present invention need only be separated from the termination module during closing (when the termination panel is moved from an open to a closed position). The relative position of the cable security member to the splice trays may remain substantially unchanged during the closing (or opening).
A splitter module array (one or more splitters) can be built up incrementally in a cabinet by adding one pre-connectorized splitter module at a time in some embodiments of the present invention. The splitter module may, for example, be splitter/splice trays coupled to a hanger bracket for purposes of mounting.
However, alternative embodiments may use a splitter box that is loaded into a rack or some other bracket. Labels on the forward facing edge of the splitter module may be included to indicate subscribers allocated to that splitter. Labels on the front of the splitter module could also be included to indicate test data and/or relevant manufacturing information.
In some embodiments of the present invention, random over-length storage of connectorized pigtails exiting the splitters may incorporate the use of half moon spools, which may provide bend control as well as incremental slack compensation.
The spools may be, for example, evenly spaced such that each spool is allocated to specific fields of the patch panel, which may simplify tracing, of pigtails.
In various embodiments of the present invention, only front access may be needed to work on cabinet. General fiber management and organization may be a problem with existing cabinet designs. Some embodiments of the present invention may overcome these shortcomings by regrouping the various functions (splicing, patching, splitting) in a way that may be counter-intuitive to standard practices: This regrouping of functions may significantly increase productivity, craft friendliness and/or maintainability of fiber management in interconnect cabinets according to some embodiments of the present invention.
For some embodiments of the present invention, as will be described further herein with reference to the figures, shifting the bulkhead connection point from the splitter to a patch panel may permit access to both sides of the connection point for cleaning. Also, for some embodiments of the present invention, a reduced number of loose /unterminated pigtails may need to be managed during routine maintenance and reconfiguration. Various embodiments of the present invention may provide for or more pigtails hanging in bunches and that number may be incrementally reduced as subscribers are added to the network. Some embodiments of the present invention may reduce this congestion to a maximum of 15 fibers for 1x16 splitters or 31 for lx 32 splitters. This smaller number may be reduced as subscribers are added until none are left and a new splitter is added. The unused pigtails may be stored on the side of the cabinet segregated from the active fibers. The patch panel design may allow subscribers to be identified quickly as contrasted with other known approaches that require the craft to fumble through bundles of pigtails in search of one specific customer that has subscribed to the network and needs connecting.
Embodiments of the present invention will now be described with reference to the various embodiments illustrated in Figures 1-11. Figure 1 is a schematic diagram illustrating an interconnect cabinet 100 for optical fibers according to some embodiments of the present invention. As shown in Figure 1, the interconnect cabinet 100 is used for connecting subscriber cables) 105 with the central office outside plant (OSP) cables) 110 so as to manage connectivity of subscriber locations to the central office. The interconnect cabinet 100 includes splice modules 115a, 115b, a termination module 130 having a front face that provides a patch panel, a splitter module 140 and connectorized pigtails 150a, 150b. ' As will be understood by those of skill in the art, the splice modules 115a, 115b may be used to connect optical fibers from the cables 105,110 to a backside of the optical fiber connection points (members) 120a, 120b. While two splice modules 115a, 115b are illustrated in Figure 1, more splice modules may be used depending upon the number of fibers to be routed through the interconnection cabinet 100.
Furthermore, although a separate splice module 115b is shown for use with the central office cable 110, in various embodiments of the present invention, a common splice module may be used for both the cable fibers of the subscriber 105 and the central office 110. Although splice modules for making such interconnections provide benefits in routing and control of radius of curvature and the like of optical fibers, it will understood that the present invention, in some embodiments, encompasses other methods of interconnect between the subscriber and central office cables 105,110 and the fiber connection points 120a and 120b.
As shown in Figure 1, the splitter module 140 has a connectorized pigtail 150a extending to a fiber connection point 120b to optically couple to a fiber from the central office. The fiber from the central office is connected by the splitter module 140 to the plurality of connectorized pigtails 150b. Thus, each of the connectorized pigtails 150b are associated with an optical fiber feeder cable 110 coupled to a central office, typically through an individual fiber. The splitter module 140 may be a 4 to 1, 16 to 1, 32 to 1 or the like splitter module based on the desired number of subscribers to be carried and supported by a single fiber feed to the central office.
As illustrated in the embodiments of Figure 1, ones of the fibers from the subscriber cable 105 associated with different subscriber locations axe each coupled to respective ones of the fiber connection points 120b in the patch panel front face of the termination module 130. The connectorized pigtails 150b have a cable length sufficient to allow connection of each of the pigtails 150b to the plurality of connection points 120b. As a result, service to an individual subscriber location may be readily provided or ended by coupling or decoupling one of the connectorized pigtails 150b from the one of the fiber connection points 120b associated with that subscriber. Therefore; providing a readily determined location on the front patch panel of the termination module 130 associated with each specific subscriber may simplify the task of making a connection for a field technician who might otherwise have difficulty locating a pigtail 150b associated with a specific subscriber.
For the embodiments illustrated in Figure 1, the fiber feed to the central office from the central office cables) 110, like the fiber feed of the subscriber cables) 105, is coupled through a splice module 115b to an interconnection point 120b on the patch panel front face of the termination module 130. While shown as a separate connection points 120a,120b in Figure 1, it will understood that any of the connection points 120b could likewise be used to provide an interconnection to the central office cables) 110. It will be further understood that, in some embodiments of the present invention, the input optical fiber to the splitter module 140 is spliced to a fiber in the central office cables) 110 directly without use of the termination module 130 and the connectorized pigtail 150a. For example, the input optical fiber to the splitter module 140 could be coupled to a fiber from the central office cables) in the splice module 115b.
The present invention will now be further described with reference to the embodiments of an interconnect cabinet 200 for optical fibers illustrated in Figure 2.
As shown in Figure 2, the interconnect cabinet 200 includes an enclosure 202 having an upper chamber 210 and a lower chamber 205. The enclosure 202 may be a double-walled housing configured to provide passive cooling for the cabinet 200. The subscriber and central office cables 105, 100 are received in the lower chamber 205, which is protected by a front cover panel 207. The cables 105,100 feed through a bottom panel 252 positioned between the upper chamber 210 and the lower chamber 205 through grommets 254. Thus, for example, in the embodiments of Figure 2, the upper chamber 210 may be provided a cleaner or more environmentally controlled environment than the lower chamber 205. However, it will be understood that various embodiments of the present invention may provide for direct routing of the cables 105 and 110 into the upper chamber 210 of a single chamber enclosure not having a separate lower chamber.
As shown in the embodiments of Figure 2, a termination module 230, a plurality of splitter modules 240 having connectorized pigtails 250 and a plurality of spools 270, 272 are positioned in the upper chamber 210 of the housing 202.
The termination module 230 is removably mounted to a back wall 212 of the upper chamber 210. The sputter modules 240 are removably mounted to the back wall by brackets 242.
The termination module 230 includes a termination patch panel 232 on its front face that includes a plurality of optical fiber connection points (members) 220.
The connection members 220 include sockets 221 configured to receive the connectorized plugs of the pigtails 250. As also shown in the embodiments of Figure 2, the termination patch panel 232 may be modified based on the number of optical fibers to be connected by adding additional rows of connection members 220 in the regions 222. Three brackets 234 are shown on the termination module 230 that may be used to rest on a table or other flat surface when the termination panel 232 is rotated open to allow access to a backside of the connection member 220.
The arrangement illustrated in Figure 2 may allow for front panel access to the various connectivity components for arranging connections to subscriber locations. As shown in Figure 2, front side access to the cabinet 200 is provided by opening of the rotatable door panels 260 defining the front panel of the interconnect cabinet 200. However, a single panel door, removable panel or the like could also be provided to allow front side access to the chamber 210.
The spooling system 270, 272 may be used to support routing of the pigtails 250 in a manner that may advantageously control bending of the pigtails 250 to reduce the risk of damage to the optical fiber and provide further organization to the routing of the pigtails 250, particularly where a fully loaded interconnect cabinet 200 may include a large number of such pigtails 250. The spooling system 270, 272 is mounted in the enclosure 202 and configured to receive and store excess cable length of the connectorized pigtails 250. The spools 270, in some embodiments of the present invention, are displaced from each other in the enclosure by a distance corresponding to a distance between a first and last row of the connection points 220 on the termination patch panel 232. In other words, as viewed in Figure 2, a distance from a bottom to a top one of the spools 270 may correspond to a distance from a bottom to a top row of the interconnection members 220.
As also shown in Figure 2, the spooling system 270, 272 may include an initial loop spool 272 configured to receive all the connectorized pigtails 250 and provide the connectorized pigtails a common entry point to the spools 270.
Thus, all of the pigtails 250 may first be routed underneath the initial loop spool 272 and then over a selected one of the spools 270 based on the relative distance from the bottom panel 252 of an associated row of the connection members 220 to which the pigtail 250 is to be routed. The half moon spools illustrated in Figure 2 may have a radius selected to provide the desired protection against damage due to bending of fibers in the pigtails 250. The connectorized pigtails 250 in some embodiments of the present invention are provided with substantially the same length. Use of selected ones of the spools 270 in routing may provide for occupying more or less unused length of such pigtails 250 based on which connection member row the pigtail 250 is routed to on the termination panel 232.
A plurality of splitter modules 240 and a single termination module 230 are illustrated in Figure 2. However, as seen by the space between the splitters 240 and the termination module 230, a plurality of termination modules 230 may be selectively mounted in the enclosure 202 in some embodiments of the present invention.
Figure 3 is a front perspective view further illustrating some embodiments of the present invention. In particular, Figure 3 illustrates the interconnect cabinet of Figure 2 with only one installed sputter module 240 and a second splitter module 240 in the process of being installed. For the embodiments in Figure 3, the splitter modules 240 are splitter trays having hanger brackets 344 attached thereto.
The hanger brackets 344 engage the brackets 242 to mount the splitter trays 240 in the interconnect cabinet 200. Also illustrated in the embodiments of Figure 3 is a hook 305 in a sidewall of the enclosure 202 that may be used to hang unused pigtails 250.
The hook 305 in some embodiments of the present invention may be a spool, such as a half moon spool.
Some embodiments of the present invention provide for routing of jumper cables to provide a cross-connect between two of the interconnection members 220, as contrasted with routing of pigtails 250 from the splitter modules 240. In such embodiments, the hook or mid-point spool 305 may be used and positioned at a location above the spools 270 to facilitate routing of the jumper cables. For example, the hook or mid-point spool 305 could be positioned to provide a turn-around point at the mid-point of the jumper, cable length.
Figure 4 is a perspective view of a termination module 430 according to some embodiments of the present invention with a termination panel 430a (the front face of which defines a patch panel) in an open position. The termination panel 430a may be moved to the illustrated open position by rotation about a pivot point 476 so as to allow access from the front of the interconnect cabinet 400 to a backside 420' of the interconnection members 220 mounted in the patch panel 432 of the termination panel 430a. As with the front side interconnection members 220 having sockets 221 (see Figure 2), the backside interconnection points 420' in the embodiments of Figure 4 include sockets 421 configured to receive connectorized pigtails 480 extending from a splice module 115a,115b coupled to the subscriber and/or central office cables 105, 110.
The pigtail 480 may extend from a splice chamber 430b by, for example, routing through a protective conduit 472b or a hardened cable 472b. The cables 472a, 472b may extend from splice modules 115a,115b mounted in the splice chamber 430b through an optical fiber slack receiving region 474 of the splice chamber 430b. The splice chamber 430b may also be pivotally mounted in a manner such that access to the splice region from the front side of the interconnect' cabinet 400 is provided via rotation of the splice chamber 430b about a pivot point 478.
A mounting member 430c of the termination module 430b may support the pivot points 476, 478 and provide for mounting of the termination module 430 in the interconnect cabinet 400.
Also visible in Figure 4 are the backside 470 of the patch panel 432, brackets 434 and half moon spools 470, 472. The arrangements of the spools 470, 472 differs from that described with reference to the spools 270, 272 of Figure 2 in that the lower initial loop spool 472 is aligned with the plurality of spools 470 rather than being offset toward the left side of the cabinet 200 as illustrated in Figure 2.
Figure 5 is a front perspective view of an interconnect cabinet 500 for optical fibers according to some embodiments of the present invention showing installation of a termination module 530 in the cabinet 500. As seen in Figure 5, the termination module 530 may be manually removed with the cables 105, 110 connected thereto by passing excess length of the cables 105, 110 through the grormnets 254. Such excess cable length may be stored in the lower chamber of the cabinet 500 or may be drawn from outside the cabinet 500 at a time when a technician removes the termination module 530 from the cabinet 500.
As seen in the embodiments of Figure 5, the termination module 530 includes a termination panel 530a, a splice chamber 530b and a mounting member 530c.
The respective elements 530a, 530b, 530c may operate substantially the same as described in Figure 4 with reference to like numbered elements (430a, 430b, 430c).

Further embodiments of the termination module according the present invention will now be described with reference to Figures 6a, 6b, and 6c.
Figure 6a is a perspective view of the termination module 630 in a closed position.
Figure 6b is a perspective view of the termination module 630 of Figure 6a in a first open position showing a splice chamber 630b and trays 615. Figure 6c is a perspective view of the termination module 630 of Figure 6a in a second open position showing the backside of a termination panel 630a. The termination module 630 includes the termination panel 630a, a splice chamber 630b, and a mounting member 630c. The termination panel 630a and splice chamber 630b are each rotatably mounted to the mounting member 630c. A plurality of brackets 634 are positioned on the termination panel 630a so as to provide means for resting the termination module 630 on a table or other flat surface in the open position orientation of Figure 6b or Figure 6c to facilitate work on splices and the like by a technician setting up the termination module while reducing the risk of damage to the interconnection members 620.
A movable cable securing member 682 is configured to receive, secure and/or provide strain relief for an optical fiber cable 105,110. The moveable cable securing member 682 is illustrated in a first position aligned with a closed position of the termination panel 630a and a splice chamber 630b in Figure 6a and a second position aligned with an open position of the termination panel 630a and splice chamber 630b in Figure 6b. The moveable cable securing member 682 in Figures 6a, 6b and 6b is mounted so as to align with the splice chamber 630 and splice modules 615 in each position to reduce the risk of damage due to bending of the optical fiber cables 105, 110.
Figure 6a illustrates an arrangement and orientation suitable for use when installed in an interconnect cabinet allowing access to the front side of the interconnection members 620. Figure 6c illustrates allowing access to the backside 620' of the interconnect members 620. In contrast, Figure 6b illustrates a position suitable for use during set up of the termination module 630 by a technician providing splices to fibers of the cables 105,110 using the splice modules 615.
For the embodiments of the moveable cable securing member 682 illustrated in Figure 6b, temporary brackets 686 may be provided to hold the cable securing member 682 in the second position aligned with the opened splice chamber 630b.
As shown in Figure 6b, an attachment.member 688 is provided that is configured to receive and retain a strength member of an optical fiber cable 105, 110. For the illustrated embodiment, the.attachment member 688 is a bolt, which may couple to a retaining member, such as a bracket or clamp, positioned on an opposite face of the cable securing member 682. In addition, further support may be provided by attaching the outer jacket of the cable 105,110 with a hose clamp, twist tie or the like to the tie off tabs 684.
The illustrated cable securing member 682 in Figure 6b includes two flat plate members, each of which may be configured to receive two cables 105,110. It is to be understood that other attachment members may be provided using various securing or clamping devices suitable for securely grasping a strength member of a cable and that one or more such attachment members may be provided for use with each cable secured by the cable securing member 682.
As shown by Figure 6b and Figure 6c, the termination panel 630a and splice chamber 630b are pivotably mounted to the mounting member 630c for independent pivotal movement. The mounting member 630c is configured for mounting in an interconnect cabinet 200, 300, 400, 500 using for example, the mounting holes illustrated in Figure 6b.
Before opening the termination module 630 from the position of Figure 6a to the position of Figure 6b, the cable securing member 682 may be detached from the mounting member 630c. The termination panel 630a and splice chamber 630b may then be pivoted to the open position of Figure 6b and the cable securing member 682 may be secured into the position shown in Figure 6b using the brackets 686.
When operations related to splicing and the like are completed, a technician may remove the cable securing member 688 and the brackets 686 and reattach the cable securing member 682 as shown in Figure 6c to maintain an orientation aligned with the splice chamber 630b in the closed position of the splice chamber 630b relative to the mounting member 630c. In addition, Figure 6a shows the front side of the interconnection members 620 accessible on the patch panel 632 while Figure 6c shows access to the backside 620' of the interconnection members.
Figure 6b shows additional details of the splice chamber 630b. In particular, the splice modules 615 are pivotally mounted to respective angle mounting brackets 617 to provide access to different ones of the stacked plurality of splitter modules 615. Before completing the splicing of individual fibers within the splitter modules 615, an excess length of respective optical fibers may be provided for future use and/or modification in the optical fiber slack receiving region 674. The optical fiber slack receiving region 674 illustrated in Figure 6b is positioned between the splice modules 615 and the termination panel 630a.
Figure 7a is a side view of a termination module 730 according to further embodiments of the present invention. Figure 7b is a front perspective view of the termination module 730 of Figure 7a. As shown in Figures 7a and 7b the termination module 730 includes a termination panel 730a, a splice chamber 730b and a moulting member 730c. A region for a plurality of interconnection members 720 are provided in the patch panel 732 defined by the front face of the termination panel 730. None of the interconnection points are mounted in the patch panel 732 as illustrated in Figure 7b. However, as shown in Figure 7a, the patch panel 732 includes angled strips 796 configured to receive a plurality of interconnection members. The downward angle orientation illustrated for the strips 796 may provide improved safety for the installer by reducing the risk of light being directly aimed at the installer's eyes and/or may provide reduced infiltration of dirt and the like to the interconnection members 720 due to gravity.
The arrangement for positioning of the interconnection members 720 in Figure 7b differs from that described previously with reference to Figure 6a primarily in the provision of a staggered alignment for rows of the interconnection members 720. Such an arrangement may provide for improved accessibility of the interconnection members 720, as the cascading of pigtails feeding to the interconnection members 720 may less heavily overlay lower position interconnection member rows in the patch panel 732. The embodiments of Figure 7b and 7b further illustrate angled mounting brackets 717 for use in pivotally mounting splice modules, such as optical splice trays, in a stacked relationship.
The embodiments of Figures 7a and 7b further differ from those described with reference to Figures 6a- 6c in the particulars of the moveable cable securing member 782. As illustrated in the side view illustration of Figure 8, the cable securing member 782 is pivotable between a first position A aligned with a closed position of the termination panel 730a and splice chamber 730b and a second position B aligned with an open position of the termination panel 730a and the splice chamber 730b. An attachment member 688 and tie-off tab 784 may be provided for securing a respective optical fiber cable as described previously with reference to the similarly numbered elements of Figures 6a - 6c (684, 688). The cable securing member 688 is pivotally attached to the termination module 730 at a pivot point 790 to allow movement between the first position A and the second position B. The cable securing member 788 is configured, in some embodiments of the present invention, to pivot about a neutral axis having an arc length for a cable secured therein that is substantially the same in the first position A and the second position B to limit load on the cable secured therein during movement of the cable securing member 788 between the first position A and the second position B. A movement track 792 is provided including a securing member or bolt 794 for locking the cable securing member 782 in a desired position.
Figure 9 is a perspective view of an optical fiber splitter/splice tray 940 having a plurality of connectorized pigtails 950 according to some embodiments of the present invention. As shown in Figure 9, a mounting bracket 944 is mounted at one end of the optical fiber splitterlsplice tray 940 and the pigtails 950 extend from an opposite end thereof. Connector plugs 951 are provided at the ends of the connectorized pigtails 950. Figure 10 is a perspective view illustrating an alternative optical splitter module arrangement using a splitter box 1040 having connectorized pigtails 1050 extending therefrom, rather than an optical fiber tray. The splitter box 1040, like the splitter tray 940, may be held in place in an interconnect cabinet by, for example, tabs and/or a bracket.
Methods for outside plant management of subscriber optical fiber connectivity according to some embodiments of the present invention will now be described with reference to the flowchart illustration of Figure 11. As shown in Figure 11, operations begin at Block 1100 by providing a termination panel in an interconnect cabinet for optical fibers including a plurality of optical fiber connection points (connection members) and a splitter in the cabinet having a plurality of optic fiber connectorized pigtails extending therefrom. Such a termination panel, splitter and cabinet arrangement has been described previously with reference to Figures 1-10.
The connectorized pigtails may have a cable length sufficient to allow connection to the plurality of connection points. The connectorized pigtails are optically spliced to an optical fiber feeder cable coupled to a central office (Block 1105). The plurality of optical fiber connection points (or connection members) are optically spliced to receptive subscriber locations (Block 1110). In some embodiments of methods according the present invention, ones of the connectorized pigtails are routed around selected ones of a plurality of fiber management spools based on a location of the connection points to which they are to be coupled (Block 1115). Ones of the cormectorized pigtails are selectively coupled to ones of the connection points to provide service to the designated ones of the subscriber locations (Block 1120).
Similarly, ones of the connectorized pigtails may be selectively decoupled from one of the connection points to terminate service for a designated one of the subscriber locations.
The block diagram of Figure 1 and the flowchart of Figure 11 illustrate the architecture, functionality, and operation of possible implementations of methods for outside plant management of subscriber optical fiber connectivity according to some embodiments of the present invention. It should be noted that, in some alternative implementations, the acts noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may be executed in the reverse order, depending upon the functionality involved.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims.
In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Therefore, it is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The invention is defined by the following claims, with equivalents of the claims to be included therein.
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Claims (47)

1. An interconnect cabinet for optical fibers, comprising:
an enclosure;
a splitter mounted in the enclosure and having a plurality of optical fiber connectorized pigtails extending therefrom, each of the connectorized pigtails being associated with an optical fiber feeder cable to be coupled to a central office;
a termination panel mounted in the enclosure and having a plurality of optical fiber connection members, ones of which are associated with respective subscriber locations; and wherein the connectorized pigtails have a cable length sufficient to allow connection to the plurality of connection members.

2. The cabinet of Claim 1 wherein the splitter further comprises at least one input optical fiber and wherein the splitter is configured to splice the at least one input optical fiber to the plurality of connectorized pigtails.

3. The cabinet of Claim 2 further comprising an optical fiber cable from the central office coupled to the at least one input optical fiber and optical fiber cables from the subscriber locations coupled to the plurality of connection members.

4. The cabinet of Claim 2 wherein the sputter comprises an optical fiber splitter tray and wherein the enclosure is configured to receive a plurality of optical fiber splitter trays.

5. The cabinet of Claim 4 wherein the enclosure is configured to receive a plurality of termination panels.

6. The cabinet of Claim 2 wherein the termination panel is pivotally mounted in the enclosure to allow access to a front and a back side of the connection members from a front side of the enclosure.

7. The cabinet of Claim 6 wherein the termination panel comprises a front panel of a termination module and wherein the termination module further comprises a splice chamber configured to mount a plurality of splice modules adjacent a back side of the termination panel.

8. The cabinet of Claim 7 wherein the splice chamber is pivotally mounted in the enclosure to provide access to the splice chamber from the front side of the enclosure.

9. The cabinet of Claim 8 wherein the termination module is removably mounted in the enclosure to allow removal of the termination module through the front side of the enclosure.

10. The cabinet of Claim 8 wherein the termination module further comprises a movable cable securing member configured to receive and secure an optical fiber cable, the cable securing member having a first position aligned with a closed position of the splice chamber and a second position aligned with an open position of the splice chamber.

11. The cabinet of Claim 10 wherein the cable securing member includes an attachment member configured to receive and retain a strength member of the optical fiber cable.

12. The cabinet of Claim 10 wherein the cable securing member is detachable from the termination module to allow movement between the first position and the second position.

13. The cabinet of Claim 10 wherein the cable securing member is pivotally attached to the termination module to allow movement between the first position and the second position.

14. The cabinet of Claim 13 wherein the cable securing member pivots about a neutral axis having an arc length for a cable secured therein that is substantially the same in the first and the second positions to limit loads on the cable secured therein during movement of the cable securing member between the first and second positions.

15. The cabinet of Claim 8 wherein the enclosure is configured to receive a plurality of termination modules and a plurality of splitters.

16. The cabinet of Claim 8 wherein the termination panel and the splice chamber are pivotally mounted in the enclosure for independent pivotal movement.

17. The cabinet of Claim 2 further comprising a spooling system mounted in the enclosure and configured to receive and store excess cable length of the plurality of connectorized pigtails.

18. The cabinet of Claim 17 wherein the spooling system comprises a plurality of spools displaced from each other in the enclosure by a distance corresponding to a distance between a first and last row of connection members on the termination panel.

19. The cabinet of Claim 18 wherein a distance between a first and a last of the spools is about half the distance between first and last rows of connection members on the termination panel.

20. The cabinet of Claim 19 wherein the spooling system further comprises an initial loop spool configured to receive all the connectorized pigtails and provide the connectorized pigtails a common entry point to the spooling system.

21. The cabinet of Claim 19 wherein the spools comprise half-moon spools.

22. The cabinet of Claim 2 wherein the plurality of connectorized pigtails have substantially the same length.

23. The cabinet of Claim 2 wherein the enclosure comprises a double-walled housing configured to provide passive cooling.

24. The cabinet of Claim 2 wherein the termination module is removably mounted in the enclosure to allow removal of the termination module through the front side of the enclosure.

25. An optical fiber termination module comprising:
a mounting member adapted to be mounted to an interconnect cabinet for optical fibers;
a bulkhead termination panel pivotally mounted to the mounting member to allow access to a back side of the termination panel covered by the mounting member;
and a plurality of optical fiber connection members mounted in the termination panel.

26. The termination module of Claim 25 wherein the connection members include a front socket configured to receive a mating optical fiber plug connector and a back socket configured to receive a mating optical fiber plug connector to provide an optical coupling between the mating optical fiber plug connectors received therein.

27. The termination module of Claim 25 further comprising a splice chamber mounted to the mounting member proximate the back side of the termination panel, the splice chamber being configured to receive at least one splice module.

28. The termination module of Claim 27 wherein the splice chamber is pivotally mounted to the mounting member for pivotal movement separately from the termination panel.

29. The termination module of Claim 28 wherein a front side of the splice chamber faces the termination panel and the at least one splice module is received on an opposite, back side of the splice chamber and wherein the at least one splice module is accessible in an open position of the splice chamber.

30. The termination module of Claim 29 wherein the at least one splice module comprises a splice tray.

31. The termination module of Claim 29 further comprising the at least one splice module and a plurality of connectorized pigtails extending from the at least one splice module to the connector members on a back side of the termination panel.

32. The termination module of Claim 31 wherein the splice chamber further comprises an optical fiber slack receiving region positioned between the at least one splice module and the termination panel.

33. The termination module of Claim 29 further comprising mounting means for removably mounting the termination module in an optical fiber interconnect cabinet.

34. The termination module of Claim 28 further comprising a movable cable securing member configured to receive and secure an optical fiber cable, the cable securing member having a first position aligned with a closed position of the splice chamber and a second position aligned with an open position of the splice chamber.

35. The termination module of Claim 34 wherein the cable securing member includes an attachment member configured to receive and retain a strength member of the optical fiber cable.

36. The termination module of Claim 34 wherein the cable securing member is detachable from the termination module to allow movement between the first position and the second position.

37. The termination module of Claim 34 wherein the cable securing member is pivotally attached to the termination module to allow movement between the first position and the second position.

38. The termination module of Claim 37 wherein the cable securing member pivots about a neutral axis having an arc length for a cable secured therein that is substantially the same in the first and the second positions to limit loads on the cable secured therein during movement of the cable securing member between the first and second positions.

39. A method for configuring an interconnect cabinet for optical fibers for outside plant management of subscriber optical fiber connectivity, comprising:
providing a termination panel in the cabinet having a plurality of optical fiber connection points and a splitter in the cabinet having a plurality of optical fiber connectorized pigtails extending therefrom, the connectorized pigtails have a cable length sufficient to allow connection to the plurality of connection points;
optically splicing the connectorized pigtails to an optical fiber feeder cable coupled to a central office; and optically splicing the plurality of optical fiber connection points to respective subscriber locations.

40. The method of Claim 39 further comprising selectively coupling ones of the connectorized pigtails to ones of the connection points to provide service to designated ones of the subscriber locations.

41. The method of Claim 40 further comprising selectively decoupling one of the connectorized pigtails from one of the connection points to terminate service for a designated one of the subscriber locations.

42. The method of Claim 40 wherein the cabinet further includes a plurality of fiber management spools and wherein selectively.coupling ones of the connectorized pigtails further comprises routing the ones of the connectorized pigtails around selected ones of the fiber management spools based on a location of a connection point to which they are to be coupled.

43. The method of Claim 40 wherein optically splicing the connectorized pigtails comprises optically splicing the pigtails to an optical fiber feeder cable coupled to a central office in a splice closure outside of the interconnect cabinet.

44. An interconnect cabinet for optical fibers, comprising:
an enclosure;

a termination panel mounted in the enclosure and having a plurality of optical fiber connection members, ones of which are associated with respective subscriber locations or are associated with an optical fiber feeder cable to be coupled to a central office;
at least one jumper cable for cross-connecting ones of the connection members;
a spooling system mounted in the enclosure and configured to receive and store excess cable length of the at least one jumper cable; and wherein the at least one jumper cable has a cable length sufficient to allow cross-connecting of the plurality of connection members.

45. The cabinet of Claim 44 wherein the spooling system comprises a plurality of spools displaced from each other in the enclosure by a distance corresponding to a distance between a first and last row of connection members on the termination panel.

46. The cabinet of Claim 45 wherein a distance between a first and a last of the spools is about half the distance between first and last rows of connection members on the termination panel.

47. The cabinet of Claim 46 wherein the spooling system further comprises a mid-point spool.