Canon fax basic 2000 Servicehandbuch

A–7

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(3) Factors in international communications

• Echo

• Time taken for establishing line connection

(4) Other factors

• Lightning

Though these factors do not cause major trouble in voice transmission,

they sometimes are a problem in data transmissions such as facsimile

transmission.

Fig. A-5   Deteriorating Factors

The following Table A-1 shows phenomenon that occur due to these dete-

riorating factors and countermeasures that can be taken to remedy these

phenomenon.

Noise

Distortion

Telephone

Exchange

Telephone

Table A-1   Phenomenon Caused by Deteriorating Factors and Countermeasures

Deteriorating 

Factor

Phenomenon

Countermeasure

Transmission

loss

An increase in transmission loss

drops the signal level on the receiv-

ing facsimile. Transmission quality

drops by deterioration of S/N.

Improve the S/N ratio.

• Increase the transmission level on 

the ATT switch of the SSSW.

• Slow down the transmission 

speed.

Attenuation 

distortion

Waveform distortion increases and

image signals become more difficult

to receive.

Adjust the NL equalizer of the

SSSW.

When black drops out in the image:

→

 Turn NL ON.

When the image is blurred:

→

 Turn NL OFF.