Transmitter and tributary interface board
A technology of a transmission device and a branch circuit is applied in the field of branch circuit interface substrates, which can solve the problems of needing funds and being unable to respond flexibly to communication needs.
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[0035] Hereinafter, we describe in detail embodiments of the present invention with reference to the drawings.
[0036] (first embodiment)
[0037] figure 1 It is a system configuration diagram showing the transmission system according to the embodiment of the present invention. This system includes n transmission devices N1 to Nn connected in a chain by line cables OF. The transmission capacity of the line cable OF is the so-called STM-64 (Synchronous Transport Module-Class 64) in SDH.
[0038] The line cable OF has an active system transmission line SL and a backup system transmission line PL, and each transmission line SL, PL has a clockwise (CW) line and a counterclockwise (CCW) line.
[0039] The transmission devices N1 to Nn drop predetermined time slots from the time slots for time-division multiplexing the STM-64 signal transmitted through the line cable OF. This tagged time slot is sent as a lower-order group signal to a lower-order group de...
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