RFL Electronics RFL 9300 - Introduction; Figure 22-1. Front Panel View of RFL 93 SH FIBER Short Haul Interface Module and RFL FSU Fiber Service Unit

RFL 9300 RFL Electronics Inc.
SH FIBER
107500
DATA
YELLOW
ALARM
RX
RFL Electronics Inc. Boonton, New Jersey USA
RFL FSU 107460-1
RS-449
RX TX
TX
a. Short Haul Fiber Interface Module b. Typical Fiber Service Unit
Figure 22-1. Front panel view of RFL 93 SH FIBER short haul interface module and RFL FSU fiber service unit
22.1 INTRODUCTION
The RFL SH FIBER, Short Haul Fiber Interface module (Figure 22-1a) and the RFL FSU Fiber Service Unit (Fig-
ure 22-1b), are used in applications where the communications equipment is remotely located from the RFL
9300 relay. Data cables routed through cable troughs in a substation environment can be subjected to induced
voltages from adjacent cables, producing intermittent loss of communications. To eliminate this problem the
RFL SHF module provides immunity by using a fiber optic communication path between the RFL 9300 and the
digital channel equipment. Refer to paragraph 22.2 for more information on the RFL 93 SHF short haul fiber
module. Refer to paragraph 22.3 for more information on the FSU module.
October 20, 2004 22 - 2 (973) 334-3100