Panasonic KX-TG6440PK, Service Manual

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KX-TG6440PK/KX-TGA641S/KX-TGA641T/KX-TGA740B
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
→
CN101 (T, R)
→
P101
→
L101, L102
→
C121, C122
→
R121, R122
→
IC501 (89, 88).
If the unit deems that a telephone connected in parallel is in use, ACK is not returned even if CAS is received, and the informa-
tion for the second and subsequent callers is not displayed on the portable handset display.