V.120 Rate Adaption – V.120 is a standard for passing
asynchronous data on the ISDN B-channels, which are
inherently synchronous. It is typically used when your
computer communicates with another computer rather than
with an Internet Service Provider.
Internet Access (PPP) –Using this setting, your ISDN TA
will accept calls that use PPP.
Asynchronous 128K – This is a 3Com U. S. Robotics
proprietary channel aggregation method for achieving speeds
of up to 128 Kbps.
Asynchronous 128K does not require PPP software or a
network protocol on your computer.
Advanced Asynchronous 128K – This is a 3Com U. S.
Robotics proprietary channel aggregation method for
achieving speeds of up to 128 Kbps.
Using Dynamic Bandwidth Allocation, Advanced
Asynchronous 128K can manage the use of your ISDN line’s
B-channels, dropping a channel whenever it is not needed
based on data flow.
2
Click the Telephone Number Assignment drop-down menu to
select which of your ISDN line’s telephone numbers will be
answered as data calls.
To prevent your ISDN TA from accepting any incoming calls,
click the Telephone Number Assignment drop-down menu, then
click No Incoming Calls.
Outgoing Data Calls
The “Outgoing Calls” section allows you to set what protocol your
ISDN TA uses to make data calls, at what rate these calls are made, and
whether or not you want to use the Data Over Voice (DOV) option.
To set these options:
1
To turn on DOV, click Enable DOV. A check mark appears in
the box next to the item when it is selected.
DOV allows you to place data calls using a voice call type. A
DOV connection will achieve a maximum rate of 56 Kbps per B-
channel, but it saves you any extra charges associated with a
digital connection.
Note: DOV must be supported on the device you are connecting
to.
It also requires that the ISDN TA’s bearer capability be set to 3.1
KHz Audio. For more information on bearer capability and 3.1
KHz Audio, see the
“Voice Features”
chapter.
