Multiplex communications – Wide area network – Packet switching
Patent
1994-02-16
1995-02-14
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
3701051, 3701053, 359158, 375118, H04J 1408, H04L 708
Patent
active
053901800
ABSTRACT:
A SONET/DS-N desynchronizer and method for receiving an incoming stream of SONET (Synchronous Optical NETwork) data, having a controller for controlling numerically controlled oscillator and clock circuit which provide a desynchronized clock for smoothly adapting the rate at which data is retrieved from a data buffer to the rate at which the incoming SONET data is stored in the data buffer. Pointer adjustments are processed separately from the SONET SPE payload frequency tracking. That is, the processing of pointers, which indicates a change in the phase of the SONET SPE payload, includes detecting negative or positive pointer hits by monitoring, for example, the H1, H2 bytes in the transport overhead, and advancing or retarding the phase over a predetermined period of time. On the other hand, the SONET SPE payload frequency tracking includes detecting positive or negative buffer offsets by monitoring the buffer offset signal OFFSET, and increasing or decreasing, respectively, the tuning word to compensate for the detected positive or negative buffer offset.
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Marcelo Melvin
NEC America Inc.
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