OfficeServ 7100 Service Manual
© SAMSUNG Electronics Co., Ltd.
2-13
2.5.2.2 Major Features
The major features of the 4TRM module by blocks are as follows:
DAA (CPC5623)-Line interface circuit.
The DAA chip(CPC5623) is connected to the system and the line coming from C.O or
PABX extension to provide the analog loop start interface and carries out the following
functions:
y
Ring Detection
y
Hook Off/On
y
CID Detection
y
PRS detection
y
Loop Supervision
y
DC/AC termination
y
Primary/secondary separation and Line Balancing
The following figure shows the DAA chip block diagram.
Figure 2.6
Block Diagram of the DAA Chip
Transmit
Isolation
Amplifier
Receive
Isolation
Amplifier
Snoop
Amplifier
Ringing Detect Outputs
Half Wave
Fault Wave
RING
RING2
Rx+
Rx-
OH
MODE
Tx+
Tx-
Isolation Barrier
Csnoop
Csnoop
Rsnoop
Rsnoop
Transmit
Diff.
Amplifier
Transconductance
Stage
2-4 Wire Hybrid
AC/DC Termination
Hook Switch
Tx.
Gain
Trim
Rx.
Gain
Trim
Receive
Diff.
Amplifier
Rx MUX
&
Ringing
Det.
TIP
RING
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