Read Panasonic KX-TG2560B / KX-TG2560S Service Manual online
43
KX-TG2560B/KX-TG2560S
•
Call Waiting
Calling Identity Delivery on Call Waiting (CIDCW) is a CLASS service that allows a customer, while off-hook on an existing call, to
receive information about a calling party on a waited call. The transmission of the calling information takes place almost
immediately after the customer is alerted to the new call so he/she can use this information to decide whether to take the new call.
Function:
The CAS signal flows from T/R
→
R106, R107
→
C101, C102
→
IC701 pins 41~43 and the ACK (DTMF signal) is
returned to the telephone exchange. The telephone exchange that received the ACK can send the data in the same manner as
the caller ID. If the unit deems that a telephone connected in parallel is in use, ACK is not returned even if CAS is received, and
the information for the second and subsequent callers is not displayed on the portable handset display.
Call Waiting Format
Circuit Diagram
CAS
CAS: CPE Alerting Signal
Dual Tone of 2130 Hz, 2750 Hz
-15 dBm (900 ohm load)
Dual Tone of 2130 Hz, 2750 Hz
-15 dBm (900 ohm load)
80 5 ms
MARK
DATA
0~500 ms 58~75 ms
about 300 ms
(be changed by
Information Volume)
(be changed by
Information Volume)
Continuance Signal
of 1200 Hz (Data "1")
of 1200 Hz (Data "1")
ACK: Acknowledg Signal
DTMF
"D"
DTMF
"D"
ACK
0~100 ms 60 5 ms
Telephone Exchange
Cordlessphone
Cordlessphone
Signal Flow
Signal Flow
Telephone Exchange
41
42
43
49
IC701
C101
C712
R716
R739
R107
C102
R106
R709
L101
PO101
SA101
1
2
2
T
R
L102
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