> 4.3.5 | Close-down Procedure

> To close down the multiplexer follow these two steps:

> • | First, disconnect all DLCIs by sending the DLCI Release command within the multiplexer control channel frame (as described in Section 4.3.6).

> • | Finally, close down the multiplexer control channel (DLCI = 0) by sending the multiplexer close down command CLD (see Section 4.3.7). After this, both the “initiating station” and the “responding station” revert to AT command mode.

> Before closing the multiplexer make sure that there is no ongoing activity on one of the channels. For example, check that voice, CSD or GPRS connections have ended and wait until all pending AT command responses are received.