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LBI-39224
3-145
3.14 CONVENTIONAL CHANNEL
CONFIGURATION
The VMIM interface module and CIA secondary interface rack couple
conventional tone or DC controlled base stations and conventional
voting systems to the CEC/IMC switch. Each VMIM/CIA set can
provide thirty-two CEC/IMC conventional channel interfaces, and a
CEC/IMC may be equipped with two VMIM/CIA sets, providing up to
sixty-four conventional channel interfaces per CEC/IMC.
The CIA rack is considered a secondary CEC/IMC interface module
since is not a part of the primary CEC/IMC backplane structure. Each
CIA rack is connected to a VMIM by 4-wire audio links (one per
channel) between the VMIM Audio Boards and the CIA rack CI
Boards, and a single full-duplex serial control data link between the
VMIM Controller Board and the CCI Controller Board. The CIA
appears to a VMIM as an EDACS trunked site with one or more units
logged on. Each unit represents a conventional channel with System
Manager LID database programming and/or CEC/IMC Manager
conventional channel programming.
Required conventional channel configurations at the CEC/IMC
Manager include both VMIM-related channel configurations and
Conventional Interface Adapter (CIA) rack-related channel
configurations. This section primarily describes configurations which
effect the main components of a CIA rack—the Conventional Control
Interface (CCI) Board and the Conventional Interface (CI) Boards.
As described in the following section (StarGate Network Conventional
Channels) a StarGate network supports 255 conventional channels by
spreading VMIM/CIA conventional interface sets across multiple CECs
and/or IMCs in the StarGate network. For those CEC/IMCs which are
not part of a StarGate network the following section may be skipped
over for now, and Conventional Channel Configuration continued with
Section 3.8.4, VMIM Channel Configuration, on page 3-82 followed by
Conventional Channel Configuration, Section 3.14.3 on page 3-155.
3.14.1 StarGate Network Conventional Channels
A StarGate network will support up to 255 conventional channels
spread out over several CEC/IMCs. For example, in a StarGate
network four (4) CEC/IMCs may each contain 64 conventional
channels (max per CEC/IMC, 256 ÷ 64 = 4, with one less conventional