Methods and apparatus for retiming and realignment of STS-1 sign

Details Methods and apparatus for retiming and realignment of STS-1 sign Methods and apparatus for retiming and realignment of STS-1 sign

1992-03-09

1994-07-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701051, 375118, 359158, H04J 1408

Patent

active

053316410

ABSTRACT:
Apparatus and methods for retiming an STS-3 type signal are provided. The SPE of an incoming STS-3 type signal is demultiplexed into three STS-1 payloads and fed to three FIFOs, and a byte which is synchronous with the TOH is tracked through the three FIFOs to provide an indication of the FIFO depth. A frame count is also kept to track the number of frames since a last pointer movement. Stuffs or destuffs are generated based on the FIFO depth as well as based on the frame count, with a stuff or destuff generated as quickly as four frames from a previous pointer movement if the FIFO is close to full or close to empty, and less quickly (e.g., at thirty-two frames from a previous pointer movement) if the FIFO is only starting to empty or to fill. Where the STS-3 type signal is a STS-3C signal, the decision on whether to stuff or destuff is made with reference to all three depth measurement circuits as all the STS-1 payloads must be stuffed or destuffed together. Also, to realign the STS-1 components of the STS-3C signal, the J1 bytes of the signal are tracked through the FIFOs, and a logic circuit is provided having phase 3 of the outgoing STS-3 clock, and the three J1 byte control signals as inputs. The logic circuit inhibits a read of a J1 byte from any particular FIFO unless all FIFO's have a high J1 signal at phase 3 of the clock.

REFERENCES:
patent: 5030951 (1991-07-01), Eda et al.
patent: 5040170 (1991-08-01), Upp et al.
patent: 5065396, Castellano et al.
patent: 5142529 (1992-08-01), Parruck et al.
patent: 5157655 (1992-10-01), Hamlin, Jr. et al.

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