Ericsson LBI-39224 manual TDM BUS Configuration

LBI-39224

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3.7 TDM BUS CONFIGURATION

The CEC/IMC Digital Audio Switch is equipped with a Time Division Multiplexed (TDM) network which transfers audio signals, modem data signals, and user data signals throughout the switch. TDM network bus and time slot configurations are performed from the CEC/IMC Manager. These configurations set the CEC/IMC for 4- or 8-TDM bus operation and allocate a TDM time slot for each input channel. TDM time slot allocation procedures are described in the next section.

TDM bus configuration must match the specific hardware installed within the CEC/IMC, early CEC/IMC Audio Boards utilized only four

(4)buses and all later Audio Boards utilize eight (8) buses. A CEC/IMC with 4-bus Audio Boards will not route signals correctly if the CEC/IMC is configured for eight buses. A CEC/IMC with 8-bus Audio Boards but configured for 4-bus operation will operate correctly; however, approximately one-half of the total TDM time slots will not be available. The 8-bus Audio Boards include 19D903302P1 Rev. F (and later) boards with 344A3561G3 (and later) firmware, and all 19D903302P3 boards. All T1/E1 Interface Cards are 8-bus capable.

NOTE

The MOM Controller Board default TDM bus setting is eight. This default number is established within the MOM firmware. If the MOM Controller's non-volatile RAM (NOVRAM) is cleared, the CEC/IMC will return to 8-bus operation without intervention from the CEC/IMC Manager. If 4-bus operation is required, the TDM bus configuration must be reset to the required number– 4 –after a MOM Controller Board NOVRAM clear. Refer to the diagnostic procedures within LBI-38938 for instructions on clearing Controller Board

NOVRAM.

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