Samsung OFFICESERV 7100, Service Manual

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CHAPTER 12 .
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2-12
© SAMSUNG Electronics Co., Ltd.
2.5.2 4TRM Module
The 4TRM module is mounted on the UNI board and provides the circuit to connect four
C.O. lines(Loop Start C.O Line). Each port can connect general C.O. line, a private phone
or a general phone line of another keyphone system. The 4TRM module uses the up-to-date
DAA chip by Clare Inc. to minimize the use of passive elements including a transformer.
Therefore, it reduces the system weight, provides a highly integrated degree and supports
high voice quality. Up to three 4TRM modules can be mounted on an UNI board and the
OfficeServ 7100 system can mount the maximum 6 6TRM modules.
2.5.2.1 Block Diagram
The following figure shows the 4TRM block diagram. The circuit in the blue box is the
4TRM module and the block diagram describes the connection to the UNI board.
Figure 2.5 Block Diagram of the 4TRM Board
DAA
Hook SW
RING DET
PRS
CID
CO1
DAA
Hook SW
RING DET
PRS
CID
CO2
DAA
Hook SW
RING DET
PRS
CID
CO3
DAA
Hook SW
RING DET
PRS
CID
CO4
4TRM
PROTECTION CCT
DAA Peripheral Circuit
CPLD
SPI/PSI
Clock
Divide
CARD
ID
RING
DETECTION
Taken separately
MOTHER
B’D
UNI
100pln
Connector
-48 V MOTHER B’D
+3.3 V MOTHER B’D
+5 V MOTHER B’D
Hook/DP
Ring
DET
PRS
CID
SLAC
CODEC
GAIN
SERIAL I/F
Various controls
are performed
via Reegistors
CLOCK CCT
4.096 MHZ
2.048 MHZ
FOI
FS