| 摘要 |
What is disclosed is a relay and exchange system in which a plurality of exchanges for relaying and exchanging transmission information contained in frames each composed of m bits, are so constructed as to form a tandem connection by a plurality of transmission lines; a pair of multiplexing apparatuses is provided at both ends of each transmission line; on each transmission line, frames each composed of n (n < m) bits for the transmission information and a particular frame composed of both (n-1) bits for the transmission information and one bit containing signaling information in an in-slot form, are transferred; and the transferred signal is transformed into an out-slot form signal for the signaling information to be received at each exchange, wherein the particular frame contains information for identifying the signaling, which information indicates a frame phase in which the signaling information is inserted, and according to which information, the signal information is inserted in the particular frame fixedly by always detecting this particular frame between the pair of multiplexing apparatuses and also between the input side and the output side of each exchange, so that quantization noise due to the signaling information is not dispersed over the frames, except for the particular frames.
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