Transwitch Corporation

Yudhishthira Kundu

Diljit Singh

Santanu Bhattacharya

Sachin Mathur

Kumar Shakti Singh

Ashis Maitra

Pushkal Yadav

Chitra Wadhwa

Vivek Gupta

Amandeep Singh Gujral

Jitender Kaul

An apparatus for implementing VCAT in both SDH and PDH signals includes an SDH VCAT mapper coupled to a first telecom bus and a plurality of PDH units coupled to the first telecom bus and a second telecom bus. The PDH units read SDH VCAT bytes from the first telecom bus and write PDH VCAT bytes to the second telecom bus according to a gapped clock. At the data sink RS-Ack is determined before deskewing and is latched to be reported after deskewing. During deskewing, less than the maximum delay between members is tracked, thereby using less storage. Addressing of the deskewing storage is computed using a remainder algorithm.

Efficient scalable implementation of VCAT/LCAS for SDH and PDH signals

Time multiplexed processing of multiple SONET signals uses the same shared circuitry for framing, descrambling, maintenance signal processing, control byte processing and extraction, pointer tracking, retiming, and alarm indication. The signals are deserialized and multiplexed onto a byte-wide bus from which they are processed in a shared pipeline. Additional pipelines allow scaling up to higher capacity SONET signals. Each pipeline is provided with means for communicating with the other pipelines so that information derived from the processing of one stream can be shared with the processing of other streams when necessary. According to the presently preferred embodiment, bytes pass through the pipeline in five clock cycles.

Time multiplexed SONET line processing

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New Delhi, India

Yudhishthira Kundu