Motorola APX 7500 Detailed Service Manual page 6

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1.5.3 General..............................................................................................................................1-8
Chapter 2 Theory of Operation ............................................................2-1
2.1 System Overview ...........................................................................................................................2-1
2.2 Power Distribution ..........................................................................................................................2-1
2.2.1 5 Volt Regulator.................................................................................................................2-2
2.2.2 3.3 Volt Unswitched Regulator ..........................................................................................2-2
2.2.3 Wireline Voltage Regulator................................................................................................2-2
2.2.4 TPS65010 Power Management IC....................................................................................2-2
2.2.5 2.85 Volt Regulator............................................................................................................2-2
2.2.6 1.5 Volt Regulator..............................................................................................................2-2
2.2.7 Headset Microphones 4.8 Volt Regulator..........................................................................2-3
2.2.8 Headset Volume Control (RX Audio Attenuator) Voltages ................................................2-3
2.3 System Communications Overview................................................................................................2-3
2.3.1 CAN Interface Communications ........................................................................................2-3
2.3.2 CAN Bus and Auto-Termination ........................................................................................2-4
2.3.3 Nautilus FPGA...................................................................................................................2-4
2.3.4 Microcontroller and Memory..............................................................................................2-4
2.3.5 Clocks and Oscillators.......................................................................................................2-5
2.3.6 User Interface....................................................................................................................2-5
2.3.7 CODEC SSI Bus ...............................................................................................................2-5
2.3.8 SPI Bus .............................................................................................................................2-5
2.3.9 Main SSI Bus.....................................................................................................................2-6
2.3.10 Nautilus FPGA Control signals..........................................................................................2-6
2.3.11 USB Connectivity ..............................................................................................................2-6
2.3.12 USB Device port................................................................................................................2-6
2.3.13 USB Host port ...................................................................................................................2-7
2.3.14 Ethernet Connectivity ........................................................................................................2-8
2.3.15 Receive Audio Paths .........................................................................................................2-8
2.3.15.1 Headset Receive Audio............................................................................................2-8
2.3.15.2 Recorder and External PA Receive Audio ...............................................................2-9
2.3.15.3 APCO, Crosspatch, and Audio Jack Receive Audio ..............................................2-10
2.3.15.4 Wireline Receive Audio ..........................................................................................2-10
2.3.15.5 External Speaker Receive Audio............................................................................2-11
2.3.15.6 Front Panel Speaker Receive Audio ......................................................................2-11
2.3.16 Transmit Audio Path........................................................................................................2-11
2.3.16.1 Headset Transmit Audio.........................................................................................2-12
2.3.16.2 APCO and Crosspatch Transmit Audio..................................................................2-13
2.3.16.3 Wireline Transmit Audio .........................................................................................2-13
2.3.16.4 Transmit Audio Routing to Remote ........................................................................2-14
2.3.16.5 Transmit Indication .................................................................................................2-14
Chapter 3 Installation............................................................................3-1
3.1 Planning the Installation .................................................................................................................3-1
3.2 Ventilation.......................................................................................................................................3-1
3.3 Station Mounting Procedures .........................................................................................................3-1
3.3.1 Rackmount Installation ......................................................................................................3-1
3.3.2 Desktop Installation ...........................................................................................................3-2
3.3.3 Wall Mounting....................................................................................................................3-2
3.4 Antenna Connections .....................................................................................................................3-2
September 9, 2011
Table of Contents
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