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Fax Glossary

Paper capacity

Indicates the maximum number of sheets held by the unit's standard cassettes, trays or drawers.

Paper source

Indicates the number of cassettes, trays or drawers the machine is equipped with in its standard configuration and the size of the cassettes, trays or drawers (ltr=letter, lgl=legal, ldg=ledger and adj=adjustable); if the machine does not use cut-sheet paper, the type of paper used (thermal roll) is indicated.

PC interface

Indicates type of interface offered, either serial or parallel, and whether it's available as an option. When connected, a PC interface enables the fax unit to allow scanning, printing and PC-based faxing.

Polling

A feature that permits a facsimile machine to call another machine and request it to transmit documents.

Print speed

The speed, expressed in pages per minute or seconds per page, at which a facsimile machine prints pages.

Programmable Communication Interfaces (PCIs)

This is the term used by the ITU-T for a family of programmable interfaces (see the definition for API above) between different layers of application and communications programs. For example, T.611 Appli/Com is an example of a PCI at the application program level and there are other versions of PCIs for lower level communications functions which establish telephone network connections.

PSTN

This is the Public Switched Telephone Network (PSTN) which supports analog voice and fax calls. It is also sometimes called the General Switched Telephone Network (GSTN).

Question

This is the term used by ITU-T for active projects within a Study Group.  

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