Rear Board; Block Diagram; Working Principle; Figure 3-11 Diagram Of Rear Board - RCA RDR9000 Service Manual

Service Manual

3.5 Rear Board

3.5.1 Block Diagram

From
Control Head
MCU
IDC10
5VD LDO
IDC10
5VD
EXT
Ext_Mic
PWR

3.5.2 Working Principle

The rear board, being the extension board of the repeater unit, comprises the external
connectors as follows:
 DB26: This is a 26-pin connector for further development and this connector provides
USB signal, programmable GPIOs, and audio input/output, etc.
 DB15: The repeater communicates with other equipment via UART pins on the DB15
connector.
 DB9: This connector provides UART, SPI, GPIO, and power signals, and is used to
configure and control the GPS board.
 RJ45: PHY signal output from the repeater unit is processed by the transformer and
lightning protection module and then feeds to the RJ45 Ethernet connector on the rear
board for remote diagnosis&upgrade, and data communication.
SPI
Expand
DB15
For BS Application
3GPIO
Ext_Mic2
Ext_Mic1
3.3V
For Rear
Accessory
Board
IGN_IN
Fan
FAN ALARM_OUT
Driver
RS232
Ext_Mic
UART2

Figure 3-11 Diagram of Rear Board

Rear Board
Slot1_Audio
EXT
Slot2/RX_Audio
USB0
PWR
PA_Audio
IDC26
Handset_Audio
RX_Audio USB0
PA_Audio
Repeater Unit
18
3. Baseband Section
DB9
CLK_SEL
For GPS
RJ45
DB26
PTT1
IO Expand
PTT2
(Programmable IN/OUT)
Protection
Transformer
RS232
PTT
Control IO
UART1
Lightning
Ethernet
PHY