EFJohnson 3000 SERIES - Manual (Page 165)

20-1
MULTI-NET CONSOLE MODULE (MCM)
SECTION 20 MULTI-NET CONSOLE MODULE (MCM)
20.1 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 8-1
for the Basic Board block diagram. The Multi-Net
Console Module (MCM) interfaces to a VRCM-50
series dispatch console.
The MCM 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 MCM and
the console(s) controls what the MCM receives and
transmits for voice communication.
The MCM 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 MCM
also monitors the Channel Status Bus (CSB) to send
update changes to the console via the IDIB.
Figure 20-1 DATA BUS BLOCK DIAGRAM
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