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RSU-503 Redundancy Switch Unit Installation ... - Comtech EF Data

RSU-503 Redundancy Switch Unit Installation ... - Comtech EF Data


Introduction RSU-503 Redundancy Switch Unit 1.1 Overview The switch is a fully automated 1:1 protection switch designed to work with the following EFData Radio Frequency Terminals (and their amplifiers): • RFT-500 • RFT-505 • RFT-700 • RFT-705 • RFT-1200 (for RSU-503L information, refer to Appendix A) • RFT-1225 (for RSU-503L information, refer to Appendix A) • KST-2000 (for RSU-503L information, refer to Appendix A) Note: All references in this document to “RFT” apply to all the models listed above. The switch has a weather resistant enclosure which houses the indicators and controls to: • Switch RFTs and LNAs • Command the waveguide switch to toggle Specifically, the switch performs the following functions: • Controls waveguide/coaxial switch positions • Provides independent uplink and downlink paths • Routes the IF input to the online RFT • Routes the IF output from the online RFT • Initiates a switch-over in Auto mode by monitoring RFT faults • Supplies test ports for testing the standby channel • Receives RS-232/485 serial commands, routing them to the appropriate RFTs, and returns their responses • Receives its own RS-232/485 command set for Auto/Manual mode, A/B online, and address select • Provides FORM-C relay contacts for Summary Fault status Power is supplied by one or both RFTs. 1–2 Rev. 8

RSU-503 Redundancy Switch Unit Introduction Although there are no external indicators or switches (due to the nature of the weatherproof housing), there is an access panel that can be removed, allowing use of internal switches and indicators (refer to Chapter 4 for more information). Note: The internal indicators and switches are only used for factory testing and troubleshooting. The system, during setup and while running, is intended to be controlled remotely. Refer to Figure 1-2 for an interconnection block diagram of the switch. CA/3005 26 RFT-xxx #A TNC J1 TNC J2 J4 70 MHz TX/IF INPUT J14 TNC S1 3 1 2 4 6 P19 IND 70 MHz RX/IF OUTPUT J15 TNC S2 3 1 2 4 IND 6 RS-232 J16 P21 REMOTE CONTROL TNC TNC J5 TNC J12 TNC J6 P20 J13 J8 TX/IF B CA/3005 TX/IF A STANDBY TX/IF TEST INPUT TX/IF RX/IF RX/IF A RF/IF B STANDBY RF/IF TEST OUTPUT CA/3003 M&C - RS-232 A AS/3000 M&C AS/3002 RSU-503 LOW LOSS REDUNDANCY SWITCH UNIT CA/3003 M&C - RS-232 B RX/RF TX/RF CA/3005 26 RF/IF TX/IF RFT-xxx #B TX/RF RX/RF SHOWN WITH "B" ONLINE Rev. 8 1–3 6 6 CA/3004 N N J11 J3 S3 4 3 2 1 N J7 CA/3004 J10 CA/1530 TX/RF J9 6 LNA TEST INPUT CA/1530 TO ANTENNA N N LNA #A CA/3004 Figure 1-2. RSU-503 Interconnect Block Diagram IND IND WG TO N ADAPTER LNA #B REDUNDANT SWITCH PLATE 6 LNA WAVEGUIDE SWITCH FROM ANTENNA

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