Method, system and signal for carrying overhead information in a transport network employing photonic switching nodes

摘要: A communications signal which carries a purely digital wrapper and method system for generating it extracting overhead information therefrom. The can be received by high-performance format-specific receiver at the end of network as part overall payload, but also detected low-bandwidth payload-bit-rate-insensitive an intermediate node. This is achieved using alternating payload segments providing special coding on segments. Specifically, each segment consists contiguity level sequences, multi-bit symbol that encodes bit in stream. Each symbols thus sequence having one two possible transition patterns, with appropriate being chosen depending whether logic “zero” or “one”. patterns represent “one” contain enough transitions to meet synchronization automatic gain control requirements associated various equipment, while containing sufficiently distinct average (or pulse density) allow associate resultant short-term D.C. offset correct symbol.