Section 6 network interface module (netnim), 1 description, 2 operation – EFJohnson 3000 SERIES User Manual
Page 59: Network interface module, Netnim), Description, Operation, Data bus block diagram -1, 1 network interface module (netnim)
6-1
NETWORK INTERFACE MODULE (NetNIM)
SECTION 6 NETWORK INTERFACE MODULE (NetNIM)
6.1 DESCRIPTION
The NetNIM interfaces the Call Processor to the
internal communication of the Switch. The NetNIM
passes data communication via a 19200 baud full
duplex channel on the Intra-Terminal Data Bus (IDB)
to the Network Intra-terminal Data Bus (NetIDB) at
19200 baud. The NetNIM also passes data between
the Channel Status Bus (CSB) to the Network
Channel Status Bus (NetCSB).
The Master Clock and Master Sync for the PCM
busses are redundant in the NetNIM. A detection
circuit monitors the two different sets and if Master
Clock-A is off frequency, Master Clock-B is acti-
vated. If both -A and -B are off frequency, an alarm is
sent to the Call Processor and the NetNIM removes
both sets from distribution in the Switch.
The Switch is allowed a Master and Slave
NetNIM, enabled or disabled from operation on the
data communication path. The master tells the slave
when both of its clocks are off frequency and the
slave clock is distributed, if the slave clocks are on
frequency.
6.2 OPERATION
The NetNIM may be redundant using a master
and slave module. The master is placed in a card slot
with the least significant bit equal to zero. The slave
is placed in a card slot with the least significant bit
equal to one. The NetNIM Master/Slave LED is ON
for master and OFF for slave.
The card slot(s) used for the NetNIM has the
backplane wired for this operation. Refer to Section
23 for further details.
Figure 6-1 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