Ericsson LBI-39224 manual Dvim Selection, 133

LBI-39224

allow the CEC/IMC and associated consoles to process clear voice as well as Aegis™ digital and Aegis encrypted calls. DVIM channels are either pooled (dynamically assigned) or dedicated to a particular group. Each DVIM channel should be programmed for either pooled or dedicated operation. Each utilized digital voice audio channel is connected to a Digital Voice Interface Unit (DVIU). The DVIU operates either in an encryption mode or a decryption mode depending upon the relay control signal received from the DVIM Audio Board.

The lowest assigned DVIM (i.e. DVIM 1) will process all calls until all its DVIUs are busy, whereupon the next assigned DVIM will start processing calls. In order for DVIM 4 to start processing calls, all lower assigned DVIMs (DVIM 1, DVIM 2 and DVIM 3 (96 DVIUs)) must be busy. Each DVIM will balance load it's assigned DVIUs (i.e. DVIU 1 will not be reassigned until all other DVIUs assigned to this DVIM have been assigned).

There is no requirement that DVIMs be assigned in sequential order. In other words, DVIM combinations of: DVIM 1, DVIM 3 and DVIM 4 will work the same as DVIM 1, DVIM 2 and DVIM 3 or DVIM 2, DVIM 3 and DVIM 4. This allows for easier system software upgrades in the future. It is also not required that all 32 DVIUs be configured to DVIM 1 before DVIM 2 can be used. You may configure 16 DVIUs to DVIM 1 and 16 DVIUs to DVIM 2. This will allow for better fault tolerance/hot backup for DVIM controller board failure.

As with other interface modules, each DVIM is assigned a unique site assignment number (1 thru 32) within the CEC/IMC. This number corresponds to and matches the site assignment number set via the 5-bit DIP switch setting on the interface module Controller Board

3.12.1 DVIM Selection

Prior to actual channel configuration, the interface module to be configured must be selected. From the CEC/IMC Manager menu bar select Configure System / CEC/IMC Configuration / DVIM (see

Figure 12 on page 3-23) to display the DVIM Channel Configuration List dialog box, Figure 32.

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