Eicon Networks DIVA T/A ISDN manual Diva Terminal Adapters Program for Windows 95/98/NT

The DIVA Terminal Adapters Program for Windows 95/98/NT

Setting Description

MultiLink PPP When you activate Multilink PPP, the DIVA T/A combines both ISDN B-channels into a single 128 kbps communications link. Both channels remain in use as long as long as the connection is active, which may result in excessive ISDN connection charges if the link is frequently idle.

Multilink PPP reserves both ISDN B-channels for its exclusive use. If you use Multilink PPP, you will not be able to make or receive other data calls.

Analog calls are governed by a different set of rules. By default, the DIVA T/A is configured to support call bumping, which causes the DIVA T/A to drop one ISDN channel when you make or receive an analog call.

This reduces the throughput of the data call to 64 kbps. When the analog call is done, Multilink PPP re-establishes the second channel, returning the data connection to 128 kbps.

Only one of the two PHONE ports can be used when a Multilink PPP connection is active.

MultiLink PPP To save on communications charges, use Bandwidth Allocation Control Protocol

with BACP (BACP) in combination with Multilink PPP. The DIVA T/A uses BACP to monitor incoming and outgoing traffic.

As traffic volume warrants, a second ISDN channel is opened or closed. This reduces your communications charges by ensuring that two ISDN channels are never active when one is sufficient.

As with MultiLink PPP, this setting reserves both ISDN B-channels for its exclusive use. This means that if your Internet connection uses ‘MultiLink PPP with BACP’, you will not be able to make or receive other data calls.

As with MultiLink PPP, if both B-channels are active, call bumping forces the DIVA T/A to drop one ISDN channel when you make or receive an analog call.

Only one phone port can be used when a ‘MultiLink PPP with BACP’ connection is active. However, since ‘MultiLink PPP with BACP’ may only be using one ISDN channel, either Phone 1 or Phone 2 may not be available.

For example, if Phone 2 was in use when the data connection was established, the data connection uses telephone number 1. Even though telephone number 2 becomes available when Phone 2 hangs up, the data connection does not switch over. If you try to use Phone 1, you will get a busy signal.

MultiLink PPP Always On/Dynamic ISDN (AO/DI) uses the ISDN D-channel to maintain a permanent

with AO/DI connection to your ISP or corporate network. The D-channel connection operates at 16 kbps using the X.25 protocol. However, only 8-9 kbps is available for data transfer, but it can be used to send and receive low-bandwidth data such as email.

AO/DI incorporates BACP, and uses it to monitor incoming and outgoing traffic. When traffic volume warrants, it enables one or two ISDN B-channels to meet demand. As with MultiLink PPP, this setting reserves both ISDN B-channels for its exclusive use. If your Internet connection uses ‘MultiLink PPP with AO/DI’, you will not be able to make or receive other data calls.

When using ‘MultiLink PPP with AO/DI’, both B-channels can be dropped, allowing you to make or receive two analog calls. Since the data connection is still active on the D-channel, you can use both phone ports at any time. However the speed of the D-channel (16 kbps) is much slower than a B-channel (64 kbps).

DIVA T/A ISDN Modem User’s Guide ◆ Page 39