Figure 4-2 ControlCenter port setting configuration screen
2
To change the basic data settings, click the Outgoing Calls drop-
down menu in the “Data Port” section. Options in this menu
include:
Internet Access (PPP) Dynamic Bandwidth (DBA) – This
is the default setting. It allows your ISDN TA to use both B-
channels to achieve speeds of up to 128 Kbps.
It also saves you money by automatically dropping the
second B-channel whenever it is not need based on data flow.
See the
“Advanced Configuration”
chapter for more
information on configuring Dynamic Bandwidth Allocation.
Internet Access (PPP) 64 Kbps – Using this setting, your
ISDN TA transmits data on only one B-channel.
Internet Access (PPP) 128 Kbps – Using this setting, your
ISDN TA transmits data on both B-channels. It does not use
Dynamic Bandwidth Allocation, but you can use analog
devices connected to your ISDN TA.
Note: The second B-channel stays connected at all times.
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 will be communicating with another computer
rather than with an Internet Service Provider.
Asynchronous 128K – This is a 3Com U. S. Robotics
proprietary channel aggregation method for achieving speeds
of up to 128 Kbps.