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