19
KX-TG7741S/KX-TG7742S/KX-TG7743S/KX-TGA470S
Call Waiting Caller ID
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 telephone exchange transmits or receives CAS and ACK signals through each voice RX/TX route. Then FSK data and
MARK data pass the following route.
Telephone Line
→
P101
→
L101, L102
→
C105, C106
→
R105, R106
→
R108, R107
→
IC501(23, 21).
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.
CAS
CAS: CPE Alerting Signal
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)
Continuance Signal
of 1200 Hz (Data "1")
"FSK"
ACK: Acknowledged Signal
DTMF
"D"
ACK
0~100 ms 60 5 ms
Telephone Exchange
Cordlessphone
Cordlessphone
Signal Flow
Signal Flow
Telephone Exchange
Call Waiting Format
CIDOUT
Pin 24
R108
C110
R110
R109
R107
CIDINn
Pin 23
CIDINp
Pin 21
LSRn
Pin 28
C109
C107
C103
C108
R103
R105
C105
C106
C104
R106
R101
R102
R104
L101
L102
P101
L1T
L1R
1
2
SA101
V
V
IC501