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 82 of 114
RF Failover Switch Unit 60-228905
RF Circuit Diagram
Date: 01/12/2009
Page 1 of 1
A3
Issue: 4
Drawn by: EW/AJS
Not to Scale
© AWL 2009
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www.axellwireless.com
30 dB
30 dB
RF
Detector
12-030301
12-030301
90-852320
20 dB
17-019805
17-019805
93-930007
0 V
0 V
Relays Shown when level
from Fiber Optic Receiver
Path 1 is above Threshold
Rx2
is Active
Auto / Manual
Schmidt with
Hysteresis
12 V
520 mA
12 V
520 mA
D/L Path 1, Primary D/L I/P
from Dual Fibre Optic Unit
60-228703
2 X 96-900045
+12V
Manual
on
Path 1a
Path 1 Mon
0 V
RX1 / RX2
0 V
Auto
on
+12V
Relay
0V
0 V
0 V
0 V
Rx1
is Active
Schmidt with
Hysteresis
Schmidt with
Hysteresis
Path 2 Mon
Path 1b
Path 2a Path 2b
Mon DL
U/L I/P from
5 U/L Combiner
Unit 60-228907
Mon UL
90-852330
30 dB
93-930007
90-852320
20 dB
90-852330
30 dB
8 dB
93-000065
8 dB
93-000065
1
2
3
4
1
2
3
4
RF
Detector
D/L Path 2, Redundant D/L I/P
from Dual Fibre Optic Unit
60-228703
U/L Path 1, Primary U/L O/P
to Dual Fibre Optic Unit
60-228703
U/L Path 2, Redundant U/L O/P
to Dual Fibre Optic Unit
60-228703
D/L O/P to
CRCS Donor Unit
5.12.3. RF Failover Switch Unit 60-228905 System Diagram