The MM720 BRI media module provides eight ports with RJ-45 jacks that you can administer either as BRI trunk connections or BRI endpoint (phone and data module) connections.

You cannot administer the MM720 BRI media module to support both BRI trunks and BRI endpoints at the same time. However, the MM720 BRI media module supports combining both B-channels together to form a 128-kbps channel. Avaya Aura® Communication Manager 3.1 enables combining B-channels using BONDing to form a higher bandwidth connection. If you administer the MM720 BRI media module to support BRI endpoints, it will not function as a clock synchronization source.

For BRI trunking, the MM720 BRI media module supports up to eight BRI interfaces to the central office at the ISDN TE reference point. The data is transmitted in the following ways:

• Over two 64-kbps channels, called B1 and B2, which can be circuit-switched simultaneously.

• Over a 16-kbps channel, called the D-channel, which is used for signaling. The MM720 media module occupies one time slot for all eight D channels.

The circuit-switched connections have an A- or Mu-law option for voice operation. The circuit-switched connections operate as 64-kbps clear channels in Data mode.

For BRI endpoints, the MM720 BRI media module supports up to 16 BRI stations and data modules that conform to AT&T BRI, World Class BRI, and National ISDN NI1/NI2 BRI standards. The MM720 BRI media module provides 40-volt phantom power to BRI endpoints.