Overhead byte transfer in sync. digital hierarchy network node - producing virtual container signal by mixing of path and section overheads in information resembling defined multiplex signal in structure

摘要

Bytes from the section overhead (SOH) are marked (10) for writing into a FIFO memory (11) whose output (12) delivers them in the form of an information signal, the D10 byte position being shown by a marking bit. Sets of bytes from the path overhead (POH) in a triple FIFO memory (13) are selected (14) by a phase detector (15) for mixing (16) with the information signal. Pointers to its path framing head in an output unit (17) signify the start of the VC-12 output signal. ADVANTAGE - Predeterminable bytes from STM-1 signal section overhead or multiplex signal overhead can be transferred to chosen place in system, e.g. via switch matrix.