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Glossary of Secure Facsimile Terms

Listed below are definitions of words and terms used in the 90si User's and Reference Guides.

Broadcast: A signaling option in the Mil-Std-161 mode in which the transmitting device does not look for any acknowledgements during a fax transmission.

Commercial Fax Device: A Commercial-Off-The-Shelf (COTS) "standard" Group III fax machine or computer-based fax device.

Dual Mode: A 90si configuration which allows the local fax machine to communicate with both secure and commercial fax machines.

FEC: (Forward Error Correction) An option available in the Mil-Std-161 mode that can decrease errors in fax transmission over noisy communication lines. Note that STU's provide "clean" communication lines therefore eliminating the need for FEC.

Handshake: A signaling option in the Mil-Std-161 mode in which the transmitting fax device looks for acknowledgements during a fax transmission.

Mil-Std-161: The SECDEF-mandated military standard protocol for digital data transmission between fax devices. Mil-Std-161 is compatible with NATO's STANAG 5000 protocols.

Off-Hook: The state created on a telephone line when a telephone handset is picked up.

One-Touch Key: A feature on a fax machine that allows designated buttons to be programmed to go "Off-Hook" and automatically dial a telephone number. In the case of the 90si, we recommend that you program one of your fax's one-touch keys to dial a "1" and designate it the "Secure Start" key.

Public Fax: A document that does not contain sensitive or secret information and, therefore, need not be transmitted in a secure manner.

Ricoh / Compatibility: A set of digital protocols for communication between secure fax devices. These protocols allow the 90si to be backwards compatible with older secure fax machines.

SDD: Secure Data Device. An SDD is a data only version of secure telephone.

Secure Data Mode: A STU-III or STE's secure data mode encrypts confidential or classified information to be transmitted and received over standard telephone lines. It is this mode that secure faxes are transmitted using.

Secure Fax: A secure fax is a document that contains confidential or classified information that must be transmitted in a secure manner. This term is alternately used to describe the equipment used to transmit and receive classified documents. See Secure Fax Device below.

Secure Fax Device: A specially manufactured fax device that includes the interface and protocols necessary to communicate over secure telephones such as the STU-III.

STE: Secure Terminal Equipment. New secure telephone for use by the US Government.

STU-IIB: Secure Telephone Unit Generation Two Version B. NATO version of STU-III.

STU-III: Secure Telephone Unit Generation Three.

STU-IIIA: Secure Telephone Unit Generation Three Version A. US Secure telephone that can connect with a STU-IIB.

On-line 90si Reference Guide


GateWay Fax Systems, Inc.
Secure Facsimile Products --- Virginia, USA
Toll Free: 1-877-951-9800
Tel: 804-796-1900, Fax: 804-796-1116

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