HP Media Gateways G250 - Manual (Page 29)

Supported media modules in the G350
Issue 5 June 2008 29
Figure 13: The MM717 media module
MM710 E1/T1 media module
The MM710 E1/T1 media module terminates an E1 or T1 trunk. The MM710 has a built-in
Channel Service Unit (CSU) so an external CSU is not necessary. The CSU is only used for the
T1 circuit.
The MM710 features:
● ISDN PRI capability (23B+D or 30B+D)
● Trunk signaling to support US and International CO or tie trunks
● Echo cancellation in either direction
Figure 14: The MM710 media module
MM720 BRI media module
The MM720 BRI media module provides eight ports with RJ-45 jacks that can be administered
either as BRI trunk connections or BRI endpoint (telephone and data module) connections.
Note:
Note:
The MM720 BRI media module cannot be administered 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. CM 3.1 enables combining B-channels, using BONDing, to form a
higher bandwidth connection.
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 to the
central office at the ISDN TE reference point. 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 MM720
occupies one time slot for all eight D channels.