Handbook
Axell Wireless Limited
Technical Literature
WMATA CRCS Redundant Antenna System
General Overview
Document Number 60-228701HBK Issue No. 3 Date 28/05/2010 Page 11 of 114
3.3.1. Dual Fiber Optic Unit 60-228703 List of Major Sub-Components
Component
Part
Part Description Qty Per
Assembly
20-001601 12V Dual Relay Board 1
20-005401 Fiber Optic Transmitter Module 2
20-005501 Fiber Optic Receiver Module 2
96-110013 3.15 A Fuse 2
96-200024 DC/DC Converter 2
90-852420 20dB Directional Coupler 4
94-100003 Power Diode 3
3.3.2. Dual Fiber Optic Unit 60-228703 Specification
PARAMETER SPECIFICATION
RF Downlink
Frequency range
489.5MHz to 491.0MHz
496.3MHz to 496.7MHz
Coupling TX1 to Mon TX1
20 dB±1
Coupling TX2 to Mon TX2
20 dB±1
Optical Downlink
Wavelength
1310nm
TX(A) Optical TX Power
1-3 dBm
TX(B) Optical TX Power
1-3 dBm
Optical Uplink
Wavelength
1550nm
RX(A) Gain
>+15 dB
RX(A) Gain Set To
0 dB±0.5
RX(A) Alarm Threshold
< -10dBm
RX(B) Gain
>+15 dB
RX(A) Gain Set To
0 dB±0.5
RX(B) Alarm Threshold
< -10dBm
RF Uplink
Frequency range
499.3MHz to 499.7MHz
492.5MHz to 494.0MHz
Coupling RX1 to Mon RX1
20 dB±1
Coupling RX2 to Mon RX2
20 dB±1
General
Supply Voltage
12V DC or 24V DC
Current consumption
< 1.0A @ 24V DC input
< 1.5A @ 12V DC input
Alarm output
Summary volts free dry contact output
(Closed = Normal / Open = Alarm)
F/O TX1 contact output Pin 1 & 2
F/O TX2 contact output Pin 3 & 4
F/O RX1 contact output Pin 5 & 6
F/O RX1 contact output Pin 7 & 8
24V DC-DC contact output Pin 9 & 10**
**This alarm is not operational when the unit is powered from 12V DC