Figure 2.6 Block Diagram Of The Daa Chip - Samsung OFFICESERV 7100 Service Manual

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:
Ring Detection
Hook Off/On
CID Detection
PRS detection
Loop Supervision
DC/AC termination
Primary/secondary separation and Line Balancing
The following figure shows the DAA chip block diagram.
Transmit
Tx+
Diff.
Tx-
Amplifier
MODE
OH
Receive
Rx+
Diff.
Rx-
Amplifier
Ringing Detect Outputs
Half Wave
RING
Fault Wave
RING2
© SAMSUNG Electronics Co., Ltd.
Isolation Barrier
Transmit
Tx.
Isolation
Gain
Amplifier
Trim
Rx.
Receive
Gain
Isolation
Trim
Amplifier
Rx MUX
&
Ringing
Csnoop
Det.
Snoop
Csnoop
Amplifier

Figure 2.6 Block Diagram of the DAA Chip

OfficeServ 7100 Service Manual
Transconductance
Stage
2-4 Wire Hybrid
AC/DC Termination
Hook Switch
Rsnoop
Rsnoop
TIP
RING
2-13