Farallon Communications 612 - Manual (Page 91)

Advanced Features 6-7
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,
see the “CHAP Blocking” section on
page 5-12.
Using Dynamic Bandwidth Allocation
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.