Panasonic KX-FT25LA, Service Manual

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Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B
or phase C are repeated for transmission.
Phase E : Call retrieval
Phase E is the procedure for call retrieval, that is for circuit disconnection.
4. Concerning Transmission Time
Transmission Time = Control Time + Image Transmission Time + Hold Time
Transmission time consists of the following.
Control time:
This is time at the start of transmission when the functions at the sending and receiving sides are confirmed, the
transmission mode is established, and transmission and reception are synchronized.
Image transmission time:
This is the time required for the transmission of document contents (image data). In general, this time is recorded in the
catalog, etc.
Hold time:
This is the time required after the document contents have been sent to confirm that the document was in fact sent, and to
check for telephone reservations and/or the existence of continuous transmission.
5. Facsimile Standards
Item
Telephone Network Facsimile
G3 Machine
Connection Control Mode Telephone Network Signal Mode
Terminal Control Mode T. 30 Binary
Facsimile Signal Format Digital
Modulation Mode PSK (V. 27 ter) or QAM (V. 29)
Transmission Speed 300 bps (Control Signal)
2400, 4800, 7200, 9600 bps (FAX Signal)
Redundancy Compression
Process
(Coding Mode) 1 dimension: MH Mode
2 dimension: MR Mode (K=2.4)
Resolution Main Scan: 8 pel/mm
Sub Scan: 3.85, 7.7l/mm
Line Synchronization Signal EOL Signal
1 Line Transmission Time
[ms/line] Depends on the degree of data reduction.
Minimum Value: 10, 20
Can be recognized in 40ms.
6. Explanation of Technology
a. G3 Communication Signals (T. 30 Binary Process)
For G3 facsimile communication, this is the procedure for exchanging control signals between the sending and receiving
machines both before and after transmission of image signals.
Control signals at 300 bps FSK are: 1850 Hz...0, 1650Hz...1.
An example of the binary process in G3 communication is shown below.
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KX-FT25LA