Brother FAX-8650P service manual Tcf

WSW23 (Communications setting)

Selector	Function			Setting and Specifications
No.
1	Starting point of training check	0: From the head of a series of zeros
	(TCF)	1: From any arbitrary point
		No.	2	3
2			0	0	:	0%
	Allowable training error rate		0	1	:	0.5%
3			1	0	:	1%
			1	1	:	2%
		No.	4	5
4	Decoding error rate for		0	0	:	16%
			0	1	:	14%
	transmission of RTN
5			1	0	:	10%
			1	1	:	8%
6	Issue of RTN at the occurrence of		0:	Yes		1:	No
	a pagination error
7	Resolution level for reception		0:	Yes		1:	No
8	Limitation of attenuation level		0:	Yes		1:	No

NOTE: Selector 8 is not applicable to the French versions.

•Selector 1: Starting point of training check (TCF)

At the training phase of receiving operation, the called station detects for 1.0 second a training check (TCF) command, a series of zeros which is sent from the calling station for 1.5 seconds to verify training and give the first indication of the acceptability of the line.

This selector sets the starting point from which the called station should start counting those zeros. If this selector is set to "0," the called station starts counting zeros 100 ms after the head of a series of zeros is detected.

If it is set to "1," the called station starts counting zeros upon detection of 10-ms successive zeros 50 ms after the head of a series of zeros is detected. In this case, if the detection of 10-ms successive zeros is too late, the data counting period will become less than 1.0 second, making the called station judge the line condition unacceptable.

•Selectors 2 and 3: Allowable training error rate

The called station checks a series of zeros gathered in training (as described in Selector 1) according to the allowable training error rate set by these selectors. If the called station judges the line condition to be accepted, it responds with CFR; if not, it responds with FTT.

•Selectors 4 and 5: Decoding error rate for transmission of RTN

The facsimile equipment checks the actual decoding errors and then transmits an RTN according to the decoding error rate (Number of lines containing an error per page ÷ Total number of lines per page) set by these selectors.

•Selector 6: Issue of RTN at the occurrence of a pagination error

If this selector is set to "0," the facsimile equipment transmits an RTN when a pagination error occurs due to recording lag relative to receiving.

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