3Com 3C882 manual Dba

Advanced Configuration Parameter Default Values 5-2

QuickSelect

The QuickSelect feature automatically detects and uses the protocol required for each digital call, either V.120 or Async-Sync PPP. Typically, V.120 is used for communication between two computers, while PPP is used for communication between a computer and an Internet service provider.

DBA

Dynamic Bandwidth Allocation. DBA is a method of automatically reallocating bandwidth, such as a B channel. DBA allows you to place or receive a voice call while a Multilink PPP call is active.

When a voice call comes in, or if you lift the handset to place a call while you have both B channels in use because of Multilink PPP, one of the B channels is temporarily removed from the Multilink PPP call and is used for the voice call.

Once the voice call ends, that B channel is automatically returned to the Multilink PPP call. Although throughput is reduced while the voice call is active, the reliability of the Multilink PPP call is not affected.

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 but once the voice call ends, the B channel cannot be returned to the Multilink PPP call. The B channel can only be returned to the Multilink PPP call if you placed the call.