AUTOMATIC SWITCHING PROTECTION CHANNEL PROCESSOR OF SYNCHRONIZING MULTI APPARATUS

摘要

The apparatus switches transmission line according to K1 and K2 byte of synchronous transport module(STM)-1 signal of synchronous digital multiplexer unit. The apparatus comprises a latch (1) for latching K1 and K2 byte of STM-1 frame data by a first and a second signals (K1ENR,K2ENR) and clock signal (R19M), a comparator (2) for comparing K1 and K2 byte of current frame with those of former frame, a discriminator (3) for finding that the same K1 and K2 bytes are received for 3 frames successively, and a CPU interface unit (4) for sending interrupt signal to a CPU according to output signal of the discriminating unit (3).