MG-DS1 (DS1 Interface Media Module)

Table 60. MG-DS1 (DS1 Interface Media Module)

MO Name (in Alarm Log)	Alarm Level	Initial Command to Run*	Full Name of MO
MG-DS1	MAJOR	test board GGGVS sh	DS1 Interface Media Module
MG-DS1	MINOR	test board GGGVS l	DS1 Interface Media Module
MG-DS1	WARNING	test board GGGVS sh	DS1 Interface Media Module
NOTE: You must consult local records for the location and designation of the equipment rack where the G700 is mounted.

MM710 MM-DS1 Media Module With Echo Cancellation

The MM710 Media Module features an integrated echo canceller. Echo cancellation supports channels carrying voice and is not intended for channels that support data. The MM710 has the capability to detect modem tone and turn off echo cancellation accordingly for the duration of a data call. Echo cancellation on the MM710 will be administrable per channel. The echo cancellation circuitry on a given MM710 is driven by administrable parameters.

The MM710 Media Modules are intended for use with ATM, IP, wideband, or other complex services which are likely to have problems with echo.

The echo cancellation circuitry on a given MM710 is a right-to-use feature activated on the System-Parameters Customer-Options form. Also on this form is a field Maximum Number of DS1 Boards with Echo Cancellation that indicates the number of DS1 boards on which echo cancellation is activated for a specific customer.

The DS1 MEDIA MODULE form for the MM710 Media Module has fields to support echo cancellation: Echo Cancellation?, EC Direction, and EC Configuration. The Echo Cancellation? field displays only if the Echo Cancellation feature has been activated on the System-Parameters Customer Options form by entering a y in the DS1 Echo Cancellation? field. The EC Direction and EC Configuration fields do not display unless the user has entered y in the DS1 Echo Cancellation? field.

• EC Direction determines the direction from which echo will be eliminated, ether inward or outward.
• EC Configuration is the set of parameters that will be used when cancelling echo. This information is stored in firmware on the DS1-MM Media Module.

Echo cancellation is turned on or off on a trunk group basis using the change trunk-group command. If the TRUNK GROUP field, DS1 Echo Cancellation? is set to y, echo cancellation will be applied to every MM710 trunk member in that trunk group. The echo cancellation parameters used for a given trunk member are determined by the Echo Cancellation Configuration Number administered on the DS1 Media Module form for that specific trunk's board.

Echo cancellation on the MM710 is selectable per channel, even though it is administrable on a trunk group basis. For example, if all but two ports on a MM710 need to have echo cancellation applied, those two ports must be put in a trunk group where the DS1 Echo Cancellation field is set to n. The remaining ports will be in a trunk group(s) where the DS1 Echo Cancellation field is set to y. A user will have the ability to cancel echo coming from the network (far-end echo) or coming from the switch (near-end echo).