DEDICATED ASSIGN The Trunk Line Matching Switching Subsystem of a GSM Mobile Switching System with Echo Cancellation

摘要

The present invention relates to a trunk line selection switching subsystem of a GSM mobile communication exchange having a dictate assigning echo cancellation function, wherein an echo canceller is installed in a trunk line switching subsystem of a GSM mobile communication exchange, The present invention aims to provide a GSM mobile communication exchange capable of receiving an echo sound generated during a call between subscribers. A time location link unit 131 for time-division switching the voice call from the local mobile subscriber; A T1 digital trunk line processor 0,1 (111,112), a CEPT1 digital trunk line processor 0,1 (121,122) which is connected to a plurality of communication networks and performs a matching function for a T1 trunk line and a CFPT1 trunk line; The T1 digital trunk line processors 0, 1, 111, 112, and CEPT1 digital signals provided between the time position link unit 131 and the T1 digital trunk line processors 0, 1, 111, 112 and CEPT1 digital trunk line processors 0, 121, An echo canceller 133-136 for eliminating the echo transmitted from the trunk line processor 0,1 (121,122); A time position signal service processor 130 for controlling the echo canceller 133-136 and the time position link unit 131; And a matching switching processor (140) for controlling the timeslot signal service processor (130) so that the echo canceller (133-136) is controlled based on call information of the generated call.