EFJohnson 3000 SERIES - Manual (Page 101)

12-1
INTELLIGENT DISPATCH MODULE (IDM)
SECTION 12 INTELLIGENT DISPATCH MODULE (IDM)
12.1 DESCRIPTION
Refer to 3000 Series Switch Service Information
Manual, Part No. 001-3139-102, for the component
layout, parts list and schematic. Refer to Figure 7-1 for
the Basic Board block diagram. The Intelligent
Dispatch Module (IDM) interfaces to a Multi-Net II
dispatch console.
The IDM has a digital data connection that
requires a separate full duplex 9600 baud RS-232
interface called the Intelligent Dispatch Interface Bus
(IDIB). The separate data path is required to allow the
computer controlled dispatch console(s) to monitor
and display the status of other groups. This status and
display update can take place while the console is
busy with voice communication on another group. The
information exchanged between the IDM and the
console(s) controls what the IDM receives and trans-
mits for voice communication.
The IDM connects the 4-wire, 600-ohm balanced
audio with the Pulse Code Modulation (PCM) data
paths and communicates to other modules via the
Intra-Terminal Data Bus (IDB). The IDM also moni-
tors the Channel Status Bus (CSB) to send update
changes to the IDM via the IDIB.
Figure 12-1 IDM DATA BUS
CIMs CCMs
(NetIDB)
DATA BUS
INTRA-TERMINAL
NETWORK
(NetCSB)
STATUS BUS
CHANNEL
NETWORK
NETWORK
INTERFACE
MODULE
NetNIM
(CIB)
CHANNEL INTERFACE BUS
CONVENTIONAL
CHANNEL
MODULE
INTERFACE
CHANNEL
MODULE
INTRA-TERMINAL DATA BUS (IDB)
(CIB)
CHANNEL INTERFACE BUS
CHANNEL STATUS BUS (CSB)
DISPATCH
MODULE
CHANNEL
DCMs
PSTN OR PABX
TELEPHONE
MODULE
INTERFACE
TIMs
NETWORK
SYSTEM
MODULE
SNMs
SYSTEM NETWORK BUS (SNB)
CALL
PROCESSOR
WIDE
MODULE
AREA
WAMs
LOGGING
MODULE
ENCODER
LEMs
LOGGING RECORDER
ETHERNET
BUS
INTELLIGENT DISPATCH INTERFACE BUS (IDIB)
IDMs