Multiplex communications – Wide area network – Packet switching
Patent
1989-05-11
1992-07-28
Chin, Stephen
Multiplex communications
Wide area network
Packet switching
3701101, 370 84, H04J 312, H04J 324
Patent
active
051346141
ABSTRACT:
The four signaling bits contained in the eight-bit SONET signaling bytes are read from the SONET signaling row and are converted to four parallel signaling bits for storage in a RAM in quasi-SONET format, with sets of four A, four B, four C and four D bits for four consecutive channels being stored for an even and an odd tributary in one RAM memory row. Storing sets of four of the same bit for four consecutive channels simplifies the RAM write operation. A read-modify-write system is used for updating the RAM storage, wherein a row of RAM is read, modified by eight new signaling bits from two consecutive SONET signaling bytes, and is rewritten into the RAM. New signaling bits are stored to accumulate eight new signaling bits for two tributaries prior to updating the RAM with the new bits for both tributaries. The 32 signaling bits output during a RAM read operation are selectively multiplexed to output only four bits associated with a particular channel.
REFERENCES:
patent: 4967405 (1990-10-01), Upp et al.
Proceedings IEEE Global Telecommunications Conference, Tokyo, 15-18, Nov. 1987, vol. 1, New York, US, pp. 485-489; "Synchronous Optical Network Format and Terminal Applications".
Proceedings Global Telecommunications Conference, Hollywood, Fla., 28 Nov.-1Dec. 1988, vol. 2, New York, pp. 980-986; N. B. Sandesara et al.,: "SONET Intra-Office Interconnect Signal".
Baydar Ertugrul
Williams Timothy J.
Alcatel Network Systems, Inc.
Chin Stephen
Chin Wellington
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