220
DX-600/800
APR 2002
Edition 1.0
6.2.7
Line Control Circuit
The Line Control Circuit consists of CML relay, DP circuit, DAA (Direct Access Arrangement), Ring Detect
Circuit for power-save and DC hold circuit. A Jack for an external telephone, which can be used for either
an external telephone or an optional Handset Kit. The block diagram of the Line Control Circuit is shown
below.
DP Control
Ringer Signal Detection,
TAM I/F,
DTMF Remote Detection
Off-Hook
Detection
Speech
IC
DAA
Line
I/F
Si3015
(IC23)
DP
Circuit
DC Hold
Circuit
Ringer Signal
Detector
for Wake-up
(PC2)
Ringer
IC
+
-
~
~
Hook SW
External
Telephone
Jack
Connect only to
one module
Line
CML Relay
Optional Handset Kit
+
-
~
~
DAA
Control
I/F
Si3021
MODEM
MN195006
CPU
PNL
10MW
Line Control Circuit
MJR PCB
SC PCB
(IC24)
Summary of Contents for DX-600
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