User Manual

P B L Tunnels Loc 2 Units 1 & 2 + 800MHz BDA
Maintenance Handbook
H/book Number:-60-056100HBKM
Issue No:-1
Date:-13/02/2003
Page:-65 of 65
5.1.11 Fibre Optic Receiver & Transmitter (98-200003 & 98-300003)
5.1.11.1 Description
The F/O units consist of a receiver & transmitter, which modulates the RF signal onto a laser
carrier and transmits it via fibre/optic cable to a receiver unit some distance away where it is
demodulated back to the original RF signal with very small values of accrued attenuation.
Both transmitter and receiver modules have their own dedicated alarm outputs (volt-free relay
contacts) which are integrated into the main alarm system. Being O.E.M devices, no drawings
or circuit diagrams are available.
Caution: The FO units are
NOT
weather proof.