Supported media modules in the G350

Figure 13: The MM717 media moduleMM710 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 moduleMM720 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:

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.

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