Farallon Communications 412 Manuel D’Utilisation

Note: You cannot use CHAP when you make Multilink PPP calls. 
CHAP is disabled by default, so this should not be a problem. 
However, if CHAP is enabled, before you make a Multilink PPP call, 
you must disable CHAP by sending the command, ATS84=1, to the 
ISDN modem using your communications application. If you are 
using a Macintosh computer, use the ISDN Setup application to turn 
off CHAP. For information, 

The ISDN modem suppor ts Dynamic Bandwidth Allocation (DBA). 
When Dynamic Bandwidth Allocation is enabled (by default), you can 
place an analog (voice) call from a device that is attached to one of 
the analog device por ts while a Multilink PPP call is active. The ISDN 
modem will automatically use one of the B channels for the analog 
call. Once the analog call ends, the ISDN modem automatically 
reestablishes that channel for Multilink PPP operation. Your voice 
call will be billed at ISDN rates because the signal is carried over 
your ISDN line.

Note: If you are on the receiving end of a Multilink PPP call and you 
place a voice call, one of the B channels will be used for the voice 
call. However, when the voice call is finished, the B channel used for 
the voice call cannot be returned to the Multilink PPP call. The B 
channel can only be returned to the call if you initiated the Multilink 
PPP call.