Avaya 03-300430 User Manual

The MM720 BRI Media Module contains eight ports that can be administered either as BRI 
trunk connections or BRI endpoint (telephone and data module) connections. 

Note:

The MM720 BRI Media Module cannot be administered to support both BRI 
trunks and BRI endpoints at the same time. Also, the MM720 BRI Media Module 
does not support combining both B-channels together to form a 128-kbps 
channel. Finally, if the MM720 BRI Media Module is administered to support BRI 
endpoints, it cannot be used as a clock synchronization source.

For BRI trunking, the MM720 BRI Media Module supports up to eight BRI interfaces, or up to 16 
trunk ports, to the central office at the ISDN S/T reference point. 

For BRI endpoints, each of the 8 ports on the MM720 BRI Media Module can support one 
integrated voice/data endpoint or up to 2 BRI stations and/or data modules. Supported 
endpoints must conform to AT&T BRI, World Class BRI, or National ISDN NI1/NI2 BRI 
standards. The MM720 BRI Media Module provides -40 volt phantom power to the BRI 
endpoints.

Information is communicated in two ways:

●

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

●

Over a 16-kbps channel, called the D-channel, that is used for signaling

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

The three LEDs on the Media Module faceplate indicate board status. When illuminated, the red 
LED indicates a board failure or a major or minor on-board alarm, the green LED indicates that 
testing is in progress, and the amber LED indicates that the board is in use.

MG-BRI

MIN

test board location

MO_MG_BRI