Transfer control device using V4 byte in synchronous multiplexer

摘要

The present invention is to perform the switching function using the V4 byte in the synchronous multiplexing device, the device of the present invention is connected to the transmission station and at least one large station to the DS1 level data through the same synchronous multiplexing device In the synchronous transmission system that can be exchanged, if the local station's operator requests the station loopback to the party through the terminal, the multiplexing device of the station can loop back the corresponding DS1 level signal. The TU12 transmitter 42, which transmits the TU12 to which the V2, V3, and V4 are added, receives the inf data including the information, receives the first latch unit f_1 to latch according to the bit clock, and V4 data indicated by the transfer command. A second latch unit f_2 latching according to the V4 clock, an AND gate AND for ANDing the bit clock, and the V4 clock, and an output of the AND gate AND as a clock terminal. An exclusive logical sum that exclusively combines the output of the third latch portion f_3, the output of the first latch portion f_1, and the output of the third latch portion f_3, by receiving the output of the second latch portion f_2. And a fourth latch portion f_4 for latching the output of the exclusive OR gate ex_or in accordance with a gate ex_or and a final bit clock. This makes it easy to maintain and operate without a TMN unit.