Panasonic KX-FB423CN Manual page 377

KX-FB423CN
8.6.1.4. TAM INTERFACE SECTION
1. Function
If EXT. TAM is selected in the Receive mode, the unit receives documents for FAX calls or the external TAM records a voice
message automatically.
To switch between the answering machine and facsimile in the EXT. TAM Mode.
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1 When the bell signal rings as many times as the number
memorized into the connected answering machine (TAM),
the answering machine is connected to the line and the
answering message is sent out to the line. (OGM out for 8
~ 16 sec.)
2 After sending the OGM, the answering machine starts to
record the message of the other party (ICM recording).
Attention 1:
No sound detection lasts 20 seconds after the telephone call is received at the answering machine. It switches to the facsimile.
Attention 2:
When the answering machine cannot answer the telephone call because of disconnection or the recording tape is full, the unit
picks up the call after 5 rings (#006 in the feature). Then it switches to the facsimile.
8.6.1.4.1. CIRCUIT OPERATION
The TAM INTERFACE circuit consists of CNG signal from the other party's detection circuit, VOX detection circuit (to judge
sound/no-sound) and RL101 (to separate EXT. TAM).
1. CNG/VOX signal detection circuit
The CNG signal from the other party's FAX is detected in MODEM IC505 (digital board).
(Signal path)
Refer to CHECK SHEET.
2. Remote receiving
This is the parallel-connected DTMF signal for the TEL or EXT.TEL mode between T and R. When the other party is a FAX,
the unit switches to FAX receiving.
(Signal Path)
Detects the DTMF signal in the MODEM.
EXTERNAL TAM OPERATION UNIT OPERATION
The length of the answering message should be 8~16
seconds.
While the message is being played, the unit starts to
detect the CNG signal.(A)
If the unit detects the CNG signal, it will switch to FAX
receiving and disconnect the external TAM automatically.
After the OGM of the external TAM is finished.
If the unit cannot detect the CNG signal for about 30
seconds, the unit will disconnect the line. (C)
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