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 85 of 114
5.12.5. RF Failover Switch Unit 60-228905 Front View
A N type port “PATH 1 D/L”, Primary D/L I/P from Jackson Graham Building CRAS System
B SMA port “PATH 1a” Primary D/L O/P
Allows signal path monitoring between
ports “A” and “B” and ports “D” and “E”
C UT141 link between ports annotated “B” and “D”
D SMA port “PATH 1b” Primary D/L I/P
E N type port “REMOTE D/L”, Primary D/L O/P to CRCS donor unit
F N type port “D/L MON -30dB”, test/monitor port coupled from Primary D/L O/P to CRCS donor unit
G N type port “PATH 2 D/L”, Redundant D/L I/P from Carmen Turner Facility CRAS System
H SMA port “PATH 2a” Redundant D/L O/P
Allows signal path monitoring between
ports “G” and “H” and ports “J” and “E”
when secondary RF path is switched in
I UT141 link between ports annotated “H” and “J”
J SMA port “PATH 2b” Redundant D/L I/P
K N type port “REMOTE U/L”, combined U/L I/P from 5 U/L Combiner Unit 60-228907
L N type port “U/L MON -30dB”, test/monitor port coupled from combined U/L I/P from 60-228907
M N type port “PATH 1 U/L”, Primary U/L O/P to Jackson Graham Building CRAS System
N N type port “PATH 2 U/L”, Redundant U/L O/P to Carmen Turner Facility CRAS System
O 24V DC input from PSU module 96-300091 in PSU shelf 96-300090
P 3.15A fuse for DC input
Q Green LED “POWER”, illuminated during normal operation
R Red LED “ALARM”, Illuminated during alarm condition
S Toggle switch “AUTO MANUAL”, switches out signal sensing to allow manual choice of D/L path
T Toggle switch “RX 1 RX 2”, for manual switching between Main and Standby Downlink paths
U Signal threshold adjust for Primary Downlink path
V Signal threshold adjust for Redundant Downlink path
W 4mm banana socket “PATH 1 MON”
Allows DC monitoring of RF path signal strength X 4mm banana socket “PATH 2 MON”
Y 4mm banana socket “0V”
Z 9 way “D” panel plug “ALARM”, local alarm summary output to Krone terminal block on rack
AA
Red LED “RELAY”, illuminated when relay is switched from Primary to Redundant D/L path
BB
Green LED “RX 1 ACTIVE”, illuminated when Primary Downlink path is active
CC
Green LED “RX 2 ACTIVE”, illuminated when Redundant Downlink path is active
DD
Green LED “AUTO”, illuminated when signal sensing is switched in to monitor D/L path signal strength
EE
Yell
ow LED “MANUAL”, illuminated when signal sensing is switched out to allow manual choice of D/L path