Hayes Microcomputer Products DIVA T/A ISDN - Manual (Page 99)

DIVA T/A ISDN Modem User’s Guide 99
Multilink PPP with AO/DI support
In the case of Multilink PPP with AO/DI support, both analog devices
can still be used as AO/DI uses the ISDN D-channel X-25 packet
service to maintain an "always on" connection between you and your
Service Provider. Low bandwidth requirements can be met using this
constant connection, such as sending and receiving e-mail, credit card
verification, etc.
For example, while a MLPPP data connection is in progress using
both B-channels, one of your telephones rings. As soon as the phone
rings, the MLPPP connection automatically drops one of the B-
channels, reducing the data connection from 128 kbps to 64 kbps, and
the voice call is then connected. If a fax call then comes in, the data
call is passed to the D-channel, reducing the data connection from 64
kbps to 9.6 kbps and the fax call is connected.
After hanging up the voice calls, if the bandwidth is required the data
connection re-establishes the B-channel and brings the data
connection back up to 64 kbps. If the fax call is then hung up, the
second B-channel will be re-established if the bandwidth is required.
The same holds true if you decide to pick up the phone for an
outgoing call.