Fiber-Span LLC FS31X-85-C ユーザーズマニュアル

Page 5 of 12                

                                  FS31LX-XX and FS31X-85-C 

Fiber Optic RF Repeater System 

Figure 2.   Fiber Transceiver Unit  User Alarms and Control Interface (FS31LM-01-

LMC) 

The user alarms and controls are organized by link type.  The Optical in / RF out section is 
for the uplink optical receivers and the RF in / Optical out section if for the downlink optical 
transmitters.  For uplink optical receivers, each receiver has a gain control that is accessed 
using a small standard screwdriver.   

 
The Opt in Alarm interface uses a wire contact header (supplied) that will plug into 
the Opt in Alarm sockets.  Connection of alarm wires to the wire contact header 
requires a small standard flathead screwdriver.  The Optical In alarm LED on the 
right side of the alarm header indicates an alarm condition for each individual uplink 
optical receiver. 
 
For Downlink optical transmitters, each Opt in Alarm interface uses a wire contact 
header (supplied) that will plug into the Opt in Alarm sockets.  Connection of alarm 
wires to the wire contact header requires a small standard screwdriver.  The alarm 
LED on the right side of the alarm header indicates an alarm condition for each 
individual downlink optical transmitter. 
 
Connect fiber optic cables last.  Use fiber optic connector cleaning precautions to 
get the highest performance from the system.  Do not make optical connector tip 
contact with any hard surface.    Be  sure  the  FC/APC  KEY is aligned before 
tightening.  Do not over tighten. 
 

 
Also known as BDA. 
Below is a diagram of the inside of the ORU.