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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<strong>RSU</strong>-<strong>503</strong> <strong>Redundancy</strong> <strong>Switch</strong> <strong>Unit</strong> Theory of Operation<br />
Although the switch M&C is considered to be the slave unit on the MTI RS-232 bus, it<br />
becomes the master when communicating to each of the two RFTs.<br />
When not servicing MTI requests, the M&C monitors indicators, faults, and voltages.<br />
When applicable, it generates switch-over pulses.<br />
3.4.2 <strong>Switch</strong> Indicators<br />
When polled from the MTI, the switch M&C will perform the following functions:<br />
1. Return a response acknowledging receipt of the command.<br />
2. Decode the address in the message, compare it to the stored addresses, and route<br />
it to its intended destination.<br />
3. Return a block of status information when requested.<br />
Address 9000 reads in the eight indicator bits representing the four uplink and four<br />
downlink indicator positions. The following tables show how the four bits are decoded to<br />
indicate whether the unit A or B is currently online.<br />
B0 B1 B2 B3<br />
Uplink<br />
WR8000, B0 WR8000, B4<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 />
Rev. 8 3–3