Installation Instructions
Document No. 538-588
Rev. 3, December, 2001
Fiber Optic Hub
Page 1 of 3
Product Description
The Fiber Optic Hub concentrates four fiber lines
into one logical trunk for the fiber building level
network (BLN) or the floor level network (FLN). The
BLN and FLN trunk electrical signals are converted
into light energy at the remote sites by Fiber Optic
Interfaces. This device is designed to work at
speeds of 300 bps to 230K bps, with a link budget of
11.5 dB.
The Fiber Optic Hub converts light energy to
electrical signals and back to light energy for the
outgoing fibers, which connect to the remote site
Fiber Optic Interfaces’ receive ports. The hub also
converts electrical signals to an Inter-Hub RS-485
bus. This bus is used for inter-connecting multiple
hubs at one location, for a maximum of 32 hubs.
The inter-hub trunk connection uses the standard
three-terminal, removable connector found on many
Siemens products. The connection can also be used
to obtain a local BLN or FLN for the building in which
the hub is installed.
The Fiber-Optic Hub is housed in a 1.5” × 7.3” × 6”
metal enclosure. It contains one power input
receptacle, eight fiber ports (four transmit and four
receive), and a three-position trunk port (refer to
Figure 2). The hub is powered by a 6 Vdc external
power pack (included). All circuits are supervised
and power limited. There are no internal settings or
user-serviceable parts. ST style port connectors are
included with the hub.
FIBER OPTIC HUB
Power
Channel 1
Channel 2
Channel 3
Channel 4
NT0211R2
TX
RX
TX
RX
TX
RX
TX
RX
I
Figure 1. Fiber Optic Hub (Front View).
NT0222R1
TX2
RX2
TRUNK
S –
+
Operating Temp. 0-50 C (32-122 F)
Power
6Vdc
350 ma
538-745 Fiber Optic Hub
TX1
RX1
TX4
RX4
TX3
RX3
POWER INPUT
RECEPTACLE
TRUNK
PORT
RECEIVE
PORT
TRANSMIT
PORT
Figure 2. Fiber Optic Hub (Rear View).
Product Numbers
Description Product
Number
Four Channel Fiber Optic Hub with
ST port connectors
538-745 (115 Vac)
538-745E (230 Vac)
115 Vac 60 Hz (14W) input 6 Vdc
1200 mA output power pack for
use with P/N 538-745
538-746
230 Vac 50 Hz (14W) input 6 Vdc
1000 mA output power pack for
use with P/N 538-745E
538-747
CAUTION: Use only the plug-in
transformer shipped with this device.
120 Vac transient protected duplex
outlet for 538-745 (not included)
529-804
Three 250V Three Metal Oxide
Varistors (MOVs) included with P/N
538-745E
527-969
Optional wall mounting kit (7”)
538-709K
Optional rack mounting kit (7”)
538-717K
Required Tools
•
19-inch rack position available if using the
rack mounting kit
•
Small slotted screwdriver
•
Wire cutters or wire strippers
•
7/16-inch (11.1mm) nut driver
Expected Installation Time
15 minutes
