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T1, T3, and SONET Networks.

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T1 Functional Elements Channel Service Unit. The channel service unit is the first interface between the user and the network and the last regeneration point for the incoming signal before it is delivered to customer premises equipment. (In the past, channel service units were part of the network, but now they also are considered as customer premises equipment.) The channel service unit is responsible for general line monitoring functions, discussed later in this chapter. If a T1 multiplexer or piece of customer premises equipment fails, the channel service unit sends streams of 1s to the network to keep the connection alive until the customer premises equipment recovers. Some T1 multiplexers and PBXs have built-in channel service units. Current intelligent channel service units provide, by supporting the extended superframe format, sophisticated line monitoring and diagnostic capabilities. Basic channel service units have limited diagnostic and monitoring capabilities. If the long-distance carrier provides T1 service in the extended superframe format, the channel service unit should also support it. FCC Part 68 local tariffs require that each T1 be terminated on a channel service unit. Channel service units are also responsible for: � Protecting the network from the surge of a long stream of 0s. ...read more.


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