Users Manual Part 1

9.2.2 XHUB Controller – Rear Panel.............................................................................. 343
9.2.2.1 XHUB Controller – Rear Panel Connectors............................................. 343
9.3 Replacing the XHUB Controller........................................................................................... 343
9.3.1 XHUB Controller – FRU
......................................................................................... 344
Chapter 10: Base Radio..........................................................................................345
10.1 Base Radio – Overview..................................................................................................... 345
10.2 Base Radio – Theory of Operation.................................................................................... 346
10.2.1 Transceiver (XCVR).............................................................................................350
10.2.2 Power Amplifier....................................................................................................350
10.3 Base Radio – Indicators and Connectors.......................................................................... 352
10.4 Replacing the Base Radio................................................................................................. 354
10.4.1 Electrostatic Discharge Precaution...................................................................... 355
10.4.2 Restoring the Base Radio.................................................................................... 355
10.4.2.1 Removing the Base Radio..................................................................... 355
10.4.2.2 Reinstalling the Base Radio................................................................... 356
Chapter 11: Power Supply Unit..............................................................................357
11.1 Power Supply Unit (PSU) – Theory of Operation.............................................................. 357
11.1.1 PSU CAN Bus Monitoring, Alarms, and Controls................................................ 358
11.1.2 Backup Battery.....................................................................................................359
11.1.2.1 Backup Battery Charging Procedure......................................................360
11.1.3 Fans..................................................................................................................... 360
11.2 Power Supply Unit (PSU) Indicators, Switches, and Connectors...................................... 360
11.2.1 PSU LED Indicators............................................................................................. 361
11.2.2 PSU Switch.......................................................................................................... 363
11.2.3 PSU Connectors.................................................................................................. 363
11.3 Replacing the Power Supply Unit (PSU)........................................................................... 364
11.3.1 Removing the Power Supply Unit (PSU)............................................................. 365
11.3.2 Installing the Power Supply Unit (PSU)............................................................... 365
11.3.3 Updating the Mapping List with the New PSU TrackID........................................365
Chapter 12: Cooling Fans.......................................................................................367
12.1 Cooling Fans Overview......................................................................................................367
12.2 Cooling Fans Theory of Operation.....................................................................................367
12.2.1 PSU Fan Control..................................................................................................368
12.2.2 Alarms and Controls Available Through PSU CAN Bus Interface....................... 368
12.2.3 Airflow.................................................................................................................. 369
12.2.4 Cooling.................................................................................................................371
12.3 Replacing the Cooling Fans...............................................................................................372
Chapter 13: MTS Troubleshooting.........................................................................373
13.1 Site Controller Troubleshooting......................................................................................... 373
6802800U74-AP
Contents
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