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90si
Secure Fax Gateway - this page is a stub

90si is a fax gateway add-on for secure voice and data terminals, developed around 1992 by GateWay Fax Systems, Inc. in Chesterfield (Virginia, USA). It is supplied as a commercial-of-the-shelf (COTS) product and is used by the US Government and others for connecting commercial fax equipment to secure voice/data terminals like STE, OMNI, Sectéra, STU-IIB, STU-IIIA and vIPer.

The device must be connectedto the red serial port (RS-232) of the secure voice/data terminal. By default, it is configured in such a way that fax messages are always sent in secure mode only.

By adding a GFS-910 Fax Switcher, the same fax machine can also be used for receiving non-secure fax messages, without swapping cables. Both items were approved for use with the STE.
  
Secure Fax Gateway 90si

Products used with 90si
Motorola STU-II/B SECTEL (NATO-version)
Secure Telephone Unit
Secure Terminal Equipment
STE
vIPer Universal Secure Phone
Documentation
  1. Mode 90si User's Guide
    GateWay Fax Systems, Inc., Rev. 4.7, 27 March 2013.

  2. 90si Quick Reference Guide
    GateWay Fax Systems, Inc., Undated.

  3. GFS-910 instructions
    Auto Fax/STU Switch.
    GateWay Fax Systems, Inc., Undated.

  4. GFS-910 auto FAX/STU switch, User's Guide
    Gateway Fax Systems, Inc. Date unknown.
Further information
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Crypto Museum. Created: Monday 14 November 2022. Last changed: Monday, 14 November 2022 - 11:00 CET.
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