User's Manual

Maintenance Handbook
Baltimore Radio Repeater System
Handbook No. 60-166701HBKM Page 15 of 24
4. INSTALLATION & COMMISIONING
4.1 Initial Installation Record
When this equipment is initially commissioned, please use the equipment set-up record sheet in the
Appendices. This will help both the installation personnel and AFL should these figures be needed for
future reference or diagnosis.
4.2 Optical Connections
The optical input and output ports will be located on the appropriate E/O shelf as shown in the rack
layout drawing and the system layout drawing. The ports are supplied with a green plastic cover,
which must be removed prior to the connection of the fibre cable. Ensure that transmitter and receiver
fibre cable are identified to prevent misconnection. At the master site, the fibre transmitters are in the
downlink path with the receivers in the uplink. At remote sites the fibre transmitters are in the uplink
with the receivers in the downlink. Observe optical safety precautions in section 1. when handling
fibre optic components.
The individual fibre optic units are fitted with a pair of status indicators on their front panels. One is a
green LED, which indicates that the unit is connected to a 12 Volt DC power supply. This indicator is
common to both transmit and receive units. The second LED on the RX module indicates that the
laser is operating (transmitting). On the RX unit the second LED indicates that a laser-light signal is
being received.
When all the fibre connections are completed and power to each site is connected each fibre unit
must show two illuminated indicators.
Ensure that connections are kept clean and are fully tightened.