Ericsson LBI-39224 - Manual (Page 163)

LBI-39224
3-133
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.