60
Network Controllers Manual
TB1
FONC 1
FONC 4
FONC 3
FONC 2
JP1
RXD
IN
TXD
OUT
TXD
OUT
RXD
IN
JP2
P1
LD1
LD2
DATA IN
EARTH
DATA OUT
P2
24V IN
12V BAT
PWR
TBL
+
+
+
+
MA
X
IM
[NWC-031.CDR]
SO-FIB w/FIB-20 Module
Application
SO-FIB
When used as the head-end fiber optic interface with a CM1(N) or
RMDP-1N, fiber optics ports FONC 1 (receiver) and FONC 4
(transmitter) must receive and transmit the signal. Fiber optic ports
FONC 2 and FONC 3 are not used for head-end applications. SO-FIB
cards located at network points other than the head-end of the fiber
optic link are "wired" in series, as illustrated in the applications
drawing.
The SO-FIB module connects to the CM1(N) and CM2(N) with a 10
conductor ribbon cable (P/N 250099) which terminates on the COMM-
3S Serial Communications Card (P/N 130144). The COMM-3S card
plugs into control module mother board communications slot P3. When
an COMM-3S card is used, the RS-232C signal is available on control
module mother board terminals 1-4, TB-1.
The ACP audio control panel (via the ACP CPU Card), the SAN and
RASP annunciators (via the SAN CPU and REM cards respectively),
may be connected to the IRC-3 network with optical cable. When fiber
optic cable is used to network these components, the RS-485
communications driver chip is removed from its socket. In its place, an
8 pin header and ribbon cable (P/N 250098) is inserted, and connected
to the SO-FIB at P4.
FIB-20
Using a single FIB-20 Serial Option Card (P/N 130160) for class B
operation or two FIB-20's mounted on two SO-FIB modules for class
A operation, a 20 mA communications sub-loop can be added to the
main fiber optic network. The FIB-20 mounts directly on the SO-FIB
board. A red LED provides visual confirmation that the 20 mA. loop is
active.
A maximum of 10 electrical drops may be made on any 20 mA loop.
The maximum distance between any three 20 mA loop interfaces is
9,600 feet of 22 or 26 gauge telephone wire. It is possible to bypass
any 1 20 mA loop card.
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