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Fax Glossary

Recommendation

This is the term used by ITU-T to describe international standards approved by its members (e.g. the ITU-T T.30 recommendation).

Resolution 1

This is a method for rapidly approving an ITU-T recommendation which is supported by a consensus of ITU-T members. Using this approach, a standard can be approved and published in about a year. The steps are: (1) Determination (see Determination) (2) Approval via letter ballot among member countries (70 % constitutes approval) and (3) Decision by unanimous consent at the next Study Group meeting.

Resolution

In facsimile, the resolution is expressed in the number of lines per inch scanned and recorded.

RFC

This is short for Request For Comment. It is the term used by the Internet Engineering Task Force (IETF) for Internet standards documents and other published information.

RFC 2301

This is the IETF standards track document which defines six profiles of TIFF image files available for use within Internet Fax . 

RFC 2305

This is the IETF standards track document which defines the simple mode of Internet Fax via email.

RFC 2532

This is the IETF standards track document which defines the extended mode of Internet Fax via email.

RS-232C interface

Usually available as an option, this feature allows the fax to communicate with a computer.

Standards Track

This is the term used by the Internet Engineering Task Force (IETF) for draft documents which are being targeted for Internet standardization.

T.30

This is the portion of the ITU-T Group 3 facsimile standard which specifies the protocol through which fax devices can exchange information about their supported characteristics and manage the fax session.

T.37

This is the ITU-T recommendation which defines a store and forward method for Internet Fax.

T.38

This is the ITU-T recommendation which defines a real time method for fax over IP networks.

T.4

This is the portion of the ITU-T Group 3 facsimile standard which specifies how image data is to be formatted for facsimile transmission and reception.

T.434

(see Binary File Transfer)

T.6

This is an ITU-T recommendation which describes a two dimensional compression method which is more efficient than T.4, using a coding technique known as Modified Modified Read (MMR).

T.611

This is the ITU-T recommendation describing a generalized software interface which permits application programs to request ITU-T telecommunications services which include Group 3 fax, Group 4 fax, electronic mail, file transfer, telex and teletex. (see PCI).

TIA

This is the Telecommunications Industry Association which is a trade association that sponsors the accredited engineering standards committees for data communications technology in the United States. These engineering committees also formulate the positions taken by the United States in the ITU-T international standards body.

TR-29

This is the identifier for the Facsimile Systems and Equipment Engineering Committee sponsored by the Telecommunications Industry Association (TIA). This committee is responsible for devising U.S. industry standards for technologies related to facsimile and computer based facsimile.

TR-29.1

This is the subcommittee of TR-29 which develops Facsimile and File Transfer Protocols for the US (now merged into the TR-29 parent committee as of 1999).

TR-29.2

This is a subcommittee of TR-29 which specializes in the development of standards in the area of programmable facsimile interfaces, notably for controlling the interaction between computers and fax devices (now merged into the TR-29 parent committee as of 1999).

TR-45

This is the TIA committee which is responsible for developing standards for the use of digital cellular equipment in North America.

Transmission speed

The speed provided is the amount of time it takes to transmit one page of the ITU-T Test Chart #1 to a remote machine made by the same manufacturer and model.

V.34

This is the ITU-T recommendation describing an advanced modulation method which can be used to transmit data at rates of up to 33.6 kilobits per seconds over analog telephone lines (the PSTN).

V.8

This is the ITU-T recommendation describing a pre-session negotiations method which is used between two modems to select the type of session which is desired and negotiate various related session attributes.

V.90

This is the ITU-T recommendation describing an advanced modulation method which can be used to transmit data downstream at rates of up to 56 kilobits per second and upstream at rates of 33.6 kilobits per seconds over analog telephone lines (the PSTN). It features use of an analog and digital modem pair.  

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