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v17sum.txt
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : V.17
Title : A 2-wire modem for facsimile applications with rates up to
14 400 bit/s
Study Group : XVII - Data Transmission over the Telephone Network
Version : New
Date of adoption : 1991
Notes :
Recommendation V.17 defines the modulation methods and operating
sequences for a modem intended only for use in high speed facsimile
applications.
Appropriate T-Series Recommendations should be consulted regarding
operating procedures and other features employed in facsimile
transmission applications, as these differ from those recommended for
high speed modems for general applications.
The modem has the following principal characteristics:
a) Provision for half duplex operation at data signalling
rates of:
- 14 400 bit/s synchronous,
- 12 000 bit/s synchronous,
- 9600 bit/s synchronous,
- 7200 bit/s synchronous;
b) Quadrature amplitude modulation with synchronous line
transmission at 2400 symbols per second.
c) Inclusion of data scramblers, adaptive equalizers and
eight-state trellis coding.
d) Two sequences for training and synchronization: long train
and resync.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).