(12) United States Patent ao) Patent No.: us 6,438,144 Bi
Guzikevits et al. (45) Date of Patent: Aug. 20,2002
(54) COMMUNICATION SYSTEM WITH TWO STAGE MULTIPLEXING
(75) Inventors: Zuri Guzikevits, Tel-Aviv; Shalom Bukimer, Holon; Ofer Melman,
Yahud, all of (IL)
(73) Assignee: ECI Telecom Ltd., Petach-Tikva (IL)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/266,476
(22) Filed: Mar. 11, 1999
(51) Int. C I. IKI4J 3/04
(52) U.S. CI 370/535; 370/498
(58) Field of Search 370/535, 498,
370/537, 538, 540, 431, 438, 244, 420, 422, 423; 379/219, 220, 229, 240, 269
(56) References Cited
U.S. PATENT DOCUMENTS
A communication system comprising:
a first multiplexing/demutliplexing stage positioned at a
first locality and connected to a telephone interchange; a plurality of second multiplexing/demultiplexing stage
positioned in a plurality of second localities apart from
said first locality; a communication link, such as a transmission line or radio
link which connects said first multiplexing/
demultiplexing stage to each of said second
multiplexing/demultipleg stages; and a plurality of subscribers lines connected to each of a
plurality said second multiplexing/demultiplexing
stages.
11 Claims, 4 Drawing Sheets
