Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 58 / 138

R&S M3SR Series 4100 HF Transceivers Comfort Control Unit (Option) - Function
6124.9007.82.01 1.22
The R&S GB 4000C Comfort Control Unit also includes a connector for connection of a Key Distribution
Device (KDD). The controller board contains a KDD transceiver for distribution of management data to
the radio.
Model 03 of R&S GB 4000C Comfort Control Unit contains a separate power supply module for 28 VDC
supply. The power supply module comprises all functional groups for generating the supply voltages
+3.3 VDC, +8.7 VDC, +5 VDC and -12 VDC. In addition, audio, RS485/RS422/RS232, Ethernet and
I
2
C bus signals from/to the control board pass through this module.
Fig. 1.8 Control Unit R&S GB4000C, Block Diagram
ICN-S4100-A-E11100-R-D0894-00206-A-01-1
ON
CU
G
GO
Keyboard
Rotary Knob
Panel Illumination
Display
5" TFT 320 x 234
W420
W430
X2
X3
IrDA
µC Bus
W410
X1
X1
RGB
IR
Encoder/
Decoder
SRAM
Goldcap-
buffered
FLASH
PROM
LCD
Contoller
SRAM
KDD
Trans-
ceiver
FPGA
Clock
4 MHz
PC
Microcontroller
EEPROM
System
Hardware
Monitor
40 MHz
32 768 Hz
Real-time
Clock
Goldcap-
buffered
X400
Main
LAN
Transceiver
Interface
AFU
RS232, RS422,
RS485
Power Supply
(only Mod. 03)
DC Power
LAN
X100
Main
RS485
X43
X44
X45
X46
X8
Audio
Test Connector
Controller Board
Front Panel Board
IrDA
Optics
KDD Connector X4