VSC9180

The VSC9180 is a multi-rate SONET/SDH transceiver with support for working and protection hitless backplane 1+1 protection. It is designed to serialize four STS-12/STM- 4 signals, or byte interleaved SONET/SDH data from 4-bit 622MHz or 16-bit 155MHz parallel buses onto redundant 2.5Gb/s serial backplane outputs. It also receives two synchronous and serial STS-48/STM-16 signals, recovers the clock, deskews them and then allows hitless selection between the two. Selection criteria can be derived from BER monitoring, in-frame status or signal integrity monitoring. The selected signal is deserialized to a 4-bit 622MHz bus, a 16-bit 155MHz bus or quad STS-12's operating at 622Mb/s.

The VSC9180 can serialize a 4-bit or 16-bit byte interleaved STS-48/STM-16 bus to working and protection 2.5Gb/s I/O
(Non Interleave mode). Alternatively it can recover four serial STS-12 backplane signals, re-align them, and interleave them to form a serial STS-48 signal (Interleave mode). Interleave mode allows the VSC9180 to be used to add 2.5Gb/s backplane connectivity to the VSC9182 40G STS-1 TSI switch, or act as a transponder between existing serial STS-48/STM- 16 signals to serial STS-12/STM-4 backplane architectures. TOH transparency is preserved and B1 parity is intelligently recalculated for compatibility with the backplane BER monitoring of adjacent devices.