MMM-6
RFC 804
CCITT Draft Recommendation T.4
As Defined In: CCITT STUDY GROUP XIV, CONTRIBUTION No.25-E
SOURCE: DRAFTING GROUP ON DRAFT RECOMMENDATION T.4
TITLE: DRAFT RECOMMENDATION T.4 - STANDARDIZATION OF GROUP 3
FACSIMILE APPARATUS FOR DOCUMENT TRANSMISSION (as
amended and agreed by Working Party XIV/2)
Draft Recommendation T.4
STANDARDIZATION OF GROUP 3 FACSIMILE APPARATUS FOR DOCUMENT
TRANSMISSION
The CCITT, considering
a. that Recommendation T.2 refers to Group 1 type apparatus
for ISO A4 document transmission over a telephone-type
circuit in approximately six minutes;
b. that Recommendation T.3 refers to Group 2 type apparatus
for ISO A4 document transmission over a telephone-type
circuit in approximately three minutes:
c. that there is a demand for Group 3 apparatus which
enables an ISO A4 document to be transmitted over a
telephone-type circuit in approximately one minute;
d. that for a large number of applications black and white
reproduction is sufficient;
e. that such a service may be requested either
alternatively with telephone conversation, or when
either or both stations are not attended; in both cases,
the facsimile operation will follow Recommendation T.30,
(unanimously) declares the view that Group 3 facsimile
apparatus for use on the general switched telephone network
and international leased circuits should be designed and
operated according to the following standards:
1. Scanning track
The message area should be scanned in the same
direction in the transmitter and receiver. Viewing the
message area in a vertical plane, the scanning direction
should be from left to right and subsequent scans should be
adjacent and below the previous scan.
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