In this mode, your ISDN TA may compress data sent by the host,
which is then decompressed before it reaches its destination. This
compression allows more data to be sent over your ISDN line’s B-
channels (at rates higher than 128 Kbps).
When Dynamic Bandwidth Allocation is in use. Advanced
Asynchronous 128K only uses one B-channel at the beginning of a
connection. When there is enough data being transmitted, the second B-
channel will be brought up without user intervention. DBA decides
when more channels are needed. In this way, DBA can help you save
money.
During a data transmission, you can use one of the Analog Device Ports
on your ISDN TA. When an analog device is used, one of the B-
channels carries the call for the Analog Device Port. After Analog
Device Port’s call is dropped, the B-channel is added back to the
Advanced Asynchronous 128K connection.
Advanced Asynchronous 128K can also support an always on
connection over D-channel if you are using AO/DI. A call is set up on
the D-channel first. When there is more data to transfer than can be sent
on this channel, one or both of your ISDN line’s B-channels are
brought up to provide data speeds up to 128 Kps (or higher with
compression).
Once the data transfer is complete, the connection over the B-channel is
dropped, and you remain connected over the D-channel. All of this
happens automatically without user intervention. Because B-channels
are brought up only when needed to boost data throughput, B-channel
connection costs can be reduced significantly.
During an AO/DI connection, you can use both B-channels for analog
connections and keep the data transmission active on the D-channel.
Advanced Asynchronous 128K is ideally suited for using your ISDN
TA to connect to maintain a constant connection to a backbone
network.
Setting Up Asynchronous 128K
To use Asynchronous 128K:
1
Open ControlCenter and click the Configuration Manager icon.
2
Click the Advanced Configuration button.
3
To set the protocol for incoming calls, click the Incoming Call
Protocol drop-down menu. Then click Asynchronous 128K.
To set the protocol for outgoing calls, click the Outgoing Call
Protocol drop-down menu. Then click Asynchronous 128K.
Setting Up Advanced Asynchronous 128K
Advanced Asynchronous 128K uses PPP and Dynamic Bandwidth
Allocation to control the number of channels to used, when those
channels are brought up, and which compression method is used.