Panasonic KX-TG4732B Service Manual page 17

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 → C121, C122 → R121, R122 → IC501 (25, 24).
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.
Telephone Exchange
Cordlessphone
BBIC
IC501
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CAS: CPE Alerting Signal
Dual Tone of 2130 Hz, 2750 Hz
-15 dBm (900 ohm load)
Signal Flow
Cordlessphone
Signal Flow
Telephone Exchange
25
24
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Call Waiting Format
CAS
80 5 ms
0~500 ms 58~75 ms
ACK
0~100 ms 60 5 ms
C121
R121
L101
C122 L102
R122
C120
17
KX-TG4732B/KX-TG4733B/KX-TG4734B/KX-TGA470B
Continuance Signal
of 1200 Hz (Data "1")
MARK
about 300 ms
(be changed by
Information Volume)
ACK: Acknowledged Signal
DTMF
"D"
L1T Telephone
SA101
Line
L1R
P101
"FSK"
DATA
"FSK"
data