Installation Instructions
Document No. 538-586
Rev. 3, December, 2001
Fiber Optic Trunk Interface
Page 1 of 3
Product Description
The Fiber Optic Trunk Interface (refer to Figure 1)
converts the building level network (BLN) and floor
level network (FLN) trunk electrical signals (RS-485)
into light energy for transmission over a fiber optic
cable and converts the light energy from a fiber
cable back to RS-485 signals. The device is
designed to work with either the BLN or FLN trunk at
speeds of 300 bps to 230K bps, with a link budget of
11.5 dB.
There are no internal settings or user-serviceable
parts in the Fiber Optic Trunk Interface. The
interface requires a duplex fiber cable between
interfaces (one fiber for transmit and one for
receive). ST style port connectors are included.
The Fiber Optic Trunk Interface is housed in a 1.5” ×
4” × 4” metal enclosure. It contains one power input
receptacle, one three-position trunk port, one fiber
transmit port, and one fiber receive port (refer to
Figure 2). The interface is powered by a 6 Vdc
external power pack (included). All circuits are
supervised and power limited.
Power
TX1
RX1
NT0281R1
FIBER OPTIC
TRUNK INTERFACE
s
Figure 1. Fiber Optic Trunk Interface (Front View).
538-735 Fiber to Trunk
TRUNK
S - +
Operating Temp. 0-50 C (32-122 F)
PWR
6Vdc
150ma
NT0220R1
POWER INPUT
RECEPTACLE
TRUNK PORT
RECEIVE
PORT
TRANSMIT
PORT
TX1 RX1
Figure 2. Fiber Optic Trunk Interface (Rear View).
Product Numbers
Description Product
Number
Fiber Optic Trunk Interface with ST
port connectors
538-735(115 Vac)
538-735E (230 Vac)
115 Vac 60Hz (14W) input 6 Vdc
600mA output power pack for use
with P/N 538-735 (included)
538-757
230 Vac 50 Hz (14W) input 6 Vdc
1000 mA output power pack for
use with P/N 538-745E (included)
538-747
CAUTION:
Use only the plug-in transformer shipped
with this device.
120 Vac transient protected duplex
outlet for 538-735 (not included)
529-804
Three 250V Metal Oxide Varistors
(MOVs) included with P/N 538-
735E
527-969
Optional wall mounting kit (4”)
538-708K
Optional rack mounting kit (4”)
538-716K
Required Tools
•
Slotted screwdriver
•
19-inch rack position available if using the
rack mounting kit
•
Wire cutters or wire strippers
•
7/16-inch (11.1mm) nutdriver
Expected Installation Time
15 minutes
Prerequisites
CAUTION:
Avoid mounting the interface in a position
that forces the fiber to make turns tighter
than a three-inch radius. The mounting
surface must also be vibration free.
•
Fiber cable installed and terminated with
proper connector.
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