Processing of arbitrarily formatted client signals to...

Details Processing of arbitrarily formatted client signals to... Processing of arbitrarily formatted client signals to...

2007-08-21

2007-08-21

Duong, Frank (Department: 2666)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S466000, C370S476000, C370S907000

Reexamination Certificate

active

09616997

ABSTRACT:
A client signal received at an ingress interface is adapted to a higher-rate transport signal. Clock frequency acceleration is achieved by an M/N-multiplying PLL where the magnitude of M and N can be restricted without causing the rate of the resulting transport signal rate to deviate unacceptably from a nominal transport signal rate. Each frame of the transport signal has a payload section with a fixed number of transport payload bytes, each of which is either a dummy byte or a client byte. The number of client bytes per transport frame is within one byte of the number of client bytes actually received at the ingress interface during the duration of the frame. The designation of each frame as a low-fill frame or a high-fill frame is automatically regulated by checking the fill level of a memory element and is redundantly encoded by the ingress interface and transmitted to an egress interface as part of the frame.

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Manchester et al, IP over SONET, IEEE, pp. 136-142, May 1998.

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