Audio band signal transmission system and method

摘要

An identification number inserting portion 26 in a multiplexing portion 33 in an audio transmission system 10 inserts a connection identification number for own connection into an audio band signal cell which is to be transmitted via an up line 60. An identification number detecting portion 30B detects that the connection identification number is transmitted again from a switching system 1 to the audio transmission system 10 via a down line 70. When an identification number detecting portion 30 confirms based on this detection that a communication path is extended in sequence over "the audio transmission system 10, the switching system 1, and the audio transmission system 10", it controls a slot/channel number converting portion 22 and a change-over switch to correct a routine such that a cell which is to be transmitted the up line 60 in the multiplexing portion 33 can be transmitted to a cell multiplexing portion 34 via a change-over switch 23 on the up line 60, a slot/channel number converting portion 22, and a change-over switch on the down line 70. <IMAGE>