Apparatus for supplying channel-control signals and maintenance

Details Apparatus for supplying channel-control signals and maintenance Apparatus for supplying channel-control signals and maintenance

1989-03-03

1990-11-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370112, 3701001, 371 51, H04J 300, H04B 1700

Patent

active

049707183

ABSTRACT:
A data link (1000) multiplexes a large number of concurrently operating channel onto a single pair of fiber-optic cables (10 and 1010). A receiver (1004A) at one end of the links determines whether it is in sychronism with the signals that it receives over one of the cables (1010), and a transmitter (1002A) includes the result of that determination with the data that it sends to the other end if the link so that devices at the other end of the link can be caused to log off in response to extended lapses in synchronism at the first end. Each transmitter also sends an error count to the other end, and is responsive to a mode signal from the other end to reduce its signal power, so that maintenance personnel can perform many testing and diagnostic procedures from a single end of the link. A single integrated-circuit chip (1005A) receives data serially from a modularly expandable shift register (208) that has recieved the data in parallel, and the chip sends the data serially in a "reverse" order so that expansion of the shift-register length requires no change in the chip.

REFERENCES:
patent: 4230913 (1980-10-01), Brothers et al.
patent: 4713810 (1987-12-01), Chum
patent: 4742518 (1988-05-01), Shedd
patent: 4766590 (1988-08-01), Hamada et al.
Lombaerde, "Fiber-Optic Multiplexer Clusters Signals from 16 RS-232-C Channels", Electronics, Mar. 24, 1982.

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