SSH EN 300 964 V6.0.1:1999

Sistemi i telekomunikacionit dixhital celular (Faza 2+) (GSM); Fjalimi me vlerë të plotë; Transmetimi i Ndërprerë (DTX) për kanalet e trafikut të të folurit me vlerë të plotë (GSM 06.31 versioni 6.0.1 Publikimi 1997)

Digital cellular telecommunications system (Phase 2+) (GSM); Full rate speech; Discontinuous Transmission (DTX) for full rate speech traffic channels (GSM 06.31 version 6.0.1 Release 1997)

Scope

The present document gives a description of the general baseband operation of full rate speech traffic channels in the
transmitter and in the receiver of GSM Mobile Stations (MS)s and Base Station Systems (BSS)s during Discontinuous
Transmission (DTX).
For clarity, the description is structured according the block diagrams in figures 1 and 4. Except in the case described
next, this structure of distributing the various functions between system entities is not mandatory for implementation, as
long as the operation on the air interface and on the speech decoder output remains the same.
In the case of BSSs where the speech transcoder is located remotely in the Base Station Controller (BSC), the
implementation of the interfaces between the DTX Handlers and the Radio Subsystem (RSS) as described in the present
document together with all their flags is mandatory, being a part of the A-bis- interface as described in GSM 08.60. In
this case the various flags also serve to avoid additional delays.
The DTX functions described in the present document are mandatory for implementation in all GSM MSs. The receiver
requirements are mandatory for implementation in all GSM BSSs, the transmitter requirements only for those where
downlink DTX will be used.
DTX shall be in operation in GSM MSs if commanded so by the network, see GSM 04.08.