
BASIC BOARD MODULE (BBM)
SECTION 7 BASIC BOARD MODULE (BBM)The Basic Board Module (BBM) is the mother board of the following modules:
•Dispatch Interface Module (DIM)
•Intelligent Dispatch Module (IDM)
•Dispatch Channel Module (DCM)
•Channel Interface Module (CIM)
•Telephone Interface Module (TIM)
•System Network Module (SNM)
•Conventional Channel Module (CCM)
•Logging Encoder Module (LEM)
•Voter Diagnostic Module (VDM)
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•Conventional Patch Module (CPM)
•Wide Area Module (WAM)
These modules are made up of the BBM plus the appropriate software and personality cards as required.
The BBM uses four wire audio to connect to the external equipment. There is an additional connection for secondary data transmission.
7.1.1 MAIN AUDIO
The main external audio connection is via RXA±, P1, pins 31 and 32, and TXA±, P1, pins 63 and 64. These connections go to P33. This allows the personality cards to intercept the lines. When a
7.1.2 SECONDARY COMMUNICATION
There is a secondary communication connection to the BBM. This is used to pass data information to and from an external device, i.e. the
7.1.3 INTERNAL COMMUNICATION
There are several switch selections for the proper internal routing and use of the audio. This occurs via switch S1 and J27. There are several internal communication buses that are selected for operation of the microprocessor. These include both data and audio buses.