3 auto/manual modes – Comtech EF Data RSU-503 User Manual
Page 45
Theory of Operation
RSU-503 Redundancy Switch Unit
3–4
Rev. 8
Downlink
B4
B5
B6
B7
WR8000, B2
WR8000, B5
IF_A
RF_A
IF_B
RF_B
1= A ON LINE
0 = B ON LINE
1 = OKAY
0 = AMBIGUITY FAULT
0
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
1
1
1 - Valid state, A online
0
1
0
0
0
0
0
1
0
1
0
0
0
1
1
0
0
0
0
1
1
1
0
0
1
0
0
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
0
0
0
1 - Valid state, B online
1
1
0
1
0
0
1
1
1
0
0
0
1
1
1
1
0
0
3.4.3 Auto/Manual Modes
In Auto mode, switch-over can only occur as a result of a fault, as listed in the following
table:
RD9001
B0
B1
UL FLT A
UL FLT B
Fault Description
0
0
No faults.
0
1
Fault on B uplink, switch to uplink A, WR8001 B0.
1
0
Fault on A uplink, switch to uplink B, WR8001 B1.
1
1
Fault on both, do nothing. Monitor, and switch to the first
unit to remote the fault.
B2
B3
DL FLT A
DL FLT B
Fault Description
0
0
No faults.
0
1
Fault on B downlink, switch to downlink A, WR8001 B2.
1
0
Fault on A downlink, switch to downlink B, WR8001 B3.
1
1
Fault on both, do nothing. Monitor, and switch to the first
unit to remote the fault.
In Manual mode, the switch initiates the online pulses from only two sources:
•
Request from the MTI
•
Onboard push-button switches
In normal service with the cover secured, switch-over can occur only from an MTI
request.