Panasonic KX FLB758RU User Manual

8.5. MODEM SECTION
8.5.1. FUNCTION
The unit uses CODEC (IC609) and ASIC (IC604) that serves as an interface between the control section for FAX transmission
and reception and the telepho ne line. During a transmitting operation, the digital image signals are modulated and sent to the
telepho ne line.
During a receiving operation, the analog image signals which are received via the telepho ne line are demodulated and
converted into digital image signals. The communication format and procedures for FAX...

synchro nization status, etc. and prepares for transmission of facsimile messages.
Phase C: Message transmission
Phase C is the procedure for the transmitting facsimile messages.
Phase D : Post message procedure
Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B
or phase C is repeated for transmission.
Phase E : Call retrieval
Phase E is the procedure for call retrieval, that is for circuit disconn ection.
 4.  Concerning Transmission...

Explanation of Signals
Control signals are comprised mainly of 8-bit identific ation signals and the data signals added to them. Data signals are
added to DIS and DCS signals.
Signal.....DIS (Digital Identific ation Signal)
Identific ation Signal Format.....00000001
Function:
Notifies the capacity of the receiving unit. The added data signals are as follows.
Signal.....DCS (Digital Command Signal)
Identific ation Signal Format.....X1000001
Example
(Some models do not support the followin g items.):
Bit...

Bit No.DIS/DTCDCS
11, 12, 13, 140, 0, 0, 0
0, 1, 0, 0
1, 0, 0, 0
1, 1, 0, 0
0, 0, 1, 0
0, 1, 1, 0
1, 0, 1, 0
1, 1, 1, 0
0, 0, 0, 1
0, 1, 0, 1
1, 0, 0, 1
1, 1, 0, 1
0, 0, 1, 1
0, 1, 1, 1
1, 0, 1, 1
1, 1, 1, 1Data signaling rate
V.27 ter fall back mode
V.27 ter
V.29
V.27 ter and V.29
Not used
Reserved
Not used
V.27 ter and V.29 and V.33
Not used
Reserved
Not used
V.27 ter and V.29 and V.33 and V.17
Not used
Reserved
Not used
ReservedData signaling rate
2400 bit/s, V.27 ter
4800 bit/s, V.27 ter
9600 bit/s,...

Bit No.DIS/DTCDCS
44Inch based resolution preferredResolution type selection
“0”: neuritic based resolution
“1 ”: inch based resolution
45Metric based resolution preferredDon ’tcare
46Minimum scan line time capability for higher resolutions
“0 ”:T
15.4=T7.7“1”:T15.4=1/2T7.7
Don ’tcare
47Selective Polling capabilitySet to “0”.
48Extend fieldExtend field
Note 1 - Standa rd facsimile units conforming to T.2 must have the followin g capabil ity: Index of cooperation (IOC)=264.
Note 2 - Standa rd facsimile...

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8.6. NCU SECTION
8.6.1. GENERAL
This section is the interface between the telepho ne line and external telepho ne. It is composed of an EXT. TEL line relay (RY202),
bell detection circuit, TAM interface circuit, line amplifie r and side tone circuits and a multiplexer.
8.6.2. EXT. TEL. LINE RELAY (RY202)
 1. Circuit Operation
Normally, this relay switches to the external telepho ne side (break) and switches to the open side (make) while OFF-HOOK.
{ IC610 (149) High Level →CN616 (18) High Level} →CN202...

8.6.5. REMOTE FAX ACTIVATION CIRCUIT
 1. Function
Anothe r telepho ne connected to same line activates the unit to the FAX mode by using a DTMF signal.
 2.  Signal Path
Refer to CHECK SHEET (P.137).
8.6.6. TAM INTERFACE CIRCUIT
This circuit is to switch between FAX receiving and the external TAM ’s message recording automatically. This circuit consists of a
transformer, multiplexer, amplifie r.
For details, please refer TAM INTERFACE SECTION (P.230).
8.7. ITS (Integrated telephone System) and MONITOR...

8.7.1.4. LOW PASS FILTER
 1. Function
This low pass filter attenuates the 16-kHz account signal from the commutator to eliminate influenc e on the conversation and
communication .
 2.  Circuit Operation
This low pass filter is an eight-order active filter, and the cutoff frequency is approximately 4 kHz.
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8.7.1.5. 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.
#EXTERNAL TAM OPERATIONUNIT OPERATION
1W hen 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...