22.3 FIBER SERVICE UNIT
The RFL FSU Fiber Service Unit (Figure 22-1b) is used with the RFL SH FIBER Short Haul Fiber Interface mod-
ule (Figure 22-1a). The FSU consists of an input section (detector) and an output section (emitter) and is housed
in a black anodized aluminum box. There are four types of Fiber Service Units, providing RS-449, G.703, V.35 or
X.21 as inputs and outputs on the non-fiber side of the connection. The FSU can be located up to 2km away
from the RFL 9300.
The RFL FSU Fiber Service Unit has a 15-pin or 37-pin male D-subminiature connector on its front panel de-
pending on the application. During installation, make sure that the screws on both ends of the mating connector
are tightened to secure the connector to the FSU panel. Fiber optic cables with type ST series bayonet fiber
optic connectors (or their equivalent) must be connected to the fiber optic heads on the rear panels of the RFL
FSU module and the RFL SHFI module. The exact mating connectors used will depend upon the heads that are
installed in these modules and the specific optic cable being used. When connecting fiber optic cables, make
sure the connectors are properly aligned before tightening, and then fully tighten them. This will help minimize
losses in the connector. Figure 22-3 shows a typical Fiber Service Unit installation.
Refer to the Fiber Service Unit Instruction Data sheet (publication number:ID C37.94FSU) for additional informa-
tion.
RFL 9300 Chassis
(Top View)
Type ST bayonet
connector ( 4 places)
Up To 2km
RS-449
G.703
V.35
or X.21
as applica-
ble
Tx fibe
Rx fiber
38 to 150 Vdc
Input Power
Fiber Service Unit
107500
Short haul fiber
interface module
Front
panel of
9300
Rear panel
of 9300
Motherboard
107460-1
107460-2
107460-3
or 107460-
4
15-pin or 37-pin
connector as ap-
plicable
Tx
Rx
Rx
Tx
Figure 22-3. Typical Fiber Service Unit Installation
RFL 9300 RFL Electronics Inc.
October 20, 2004 22 - 5 (973) 334-3100
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