Ericsson LBI-39224 manual T1/E1 Digital Site Configuration, Networked Systems Considerations

LBI-39224

NOTE

T1/E1 selection is performed at the CEC/IMC Manager on a CEC/IMC wide basis. Changing the Line Type will cause the complete T1/E1 database to be reset (lost). The Line Type shown as the "default" when the Audio Interface Type dialog box appears is how the system is configured and Line Type should not be changed.

The T1/E1 Interface Card provides a built-in T1 or E1 port for CEC/IMC interface modules. This port allows direct interfacing to T1/E1 microwave, fiber-optic, or leased lines facilities. Consequently, co-located T1/E1 multiplexing (mux) equipment at the CEC/IMC is eliminated when the T1/E1 Interface Card is employed. CEC/IMC Audio Boards are also eliminated within the particular interface module. Within each of these interface modules, one or more T1/E1 Interface Cards replace all Audio Boards. The T1/E1 Interface Card furnishes twenty-four full-duplex T1 channels in T1 mode and thirty- one full-duplex E1 channels in E1 mode. In addition to its T1/E1 port, the T1/E1 Interface Card also contains eight subrate ports which, depending upon board configuration, can provide modem-less data links over spare T1/E1 channels to either internal or external devices. Some, all, or none of these ports can be utilized depending on board configuration. Five of the subrate ports support synchronous or asynchronous data links and the remaining three are synchronous-only ports.

T1/E1 Digital Site Configuration

Networked Systems Considerations

Any system nodes that are connected using T1/E1 Interfaces must remain frequency locked at all times. The T1/E1 Interface design allows for total network synchronization by offering the following CEC/IMC Configuration options. Each of these options are selectable by configuration of both the Clock Boards and the T1/E1 Interface Cards.

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