Ericsson LBI-39224 - Manual (Page 49)

LBI-39224
3-19
Close
Choose the Close button to exit the
System Mgr/Network Mgr Entity Database dialog box, if no other
database transfers are desired, and return to the CEC/IMC Manager
main window.
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.
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.
NOTE