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Fax-testkaarten
Voor het testen van faxapparatuur is een aantal testkaarten ontwikkeld.
De standaard-testkaart 1 (Slerexebrief) van de ITU-T (internationaal
orgaan voor standaardisaties) wordt internationaal door alle leveranciers
gebruikt om zendtijden, afdruktijden, scantijden, documentgeheugen en
afdrukcapaciteit van verbruiksmaterialen te bepalen. Hieronder is een
verkleinde afdruk van deze testkaart opgenomen. Het werkelijke formaat
is A4.
iv
THE SLEREXE COMPANY LIMITED
SAPORS LANE
.
BOOLE
.
DORSET
.
BH 25 8 ER
TELEPHONE BOOLE (94513) 51617 - TELEX 123456
Our Ref. 350/ PJC/EAC 4th April, 1984
Dr. P.N. Cundall,
Mining Surveys Ltd.,
Holroyd Road,
Reading,
Berks.
Dear Pete,
Permit me to introduce you to the facility of facsimile transmission.
In facsimile a photocell is caused to perform a raster scan over the subject copy.
The variations of print density on the document cause the photocell to generate an anal-
ogous electrical video signal. This signal is used to modulate a carrier, which is trans-
mitted to a remote destination over a radio or cable communications link.
At the remote terminal, demodulation reconstructs the video signal, which is used to
modulate the density of print produced by a printing device. This device is scanning in a
raster scan synchronised with that at the transmitting terminal. As a result, a facsimile copy
of the subject document is produced.
Probably you have uses for this facility in your organisation.
Yours sincerely,
P. J. CROSS
Group Leader - Facsimile Researche
4


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KPN fax 380 Quick start guide - Dutch - 4 pages


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