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STE redirects here, for other meanings see STE (disambiguation).

STE desk set. Note slot in front for Fortezza PC Card.

Secure Terminal Equipment (STE) is the U.S. Government's current (as of 2004), encrypted telephone communications system for wired or "landline" communications. It is intended to replace the older STU-III system. STE is designed to use ISDN telephone lines which offer higher speeds of up to 128k bits per second and are all digital. The greater bandwidth allows higher quality voice and can also be utilized for data and fax transmission through a built-in RS-232 port. STE sets are backwards compatible with STU-III phones.

STE sets look like ordinary high-end office desk telephones and can place unsecured calls to anywhere on the public switched telephone network (PSTN). There is a PC Card slot in the STE that allows a Fortezza Plus (KOV-14) Crypto Card to be inserted. When an NSA configured Crypto Card is present, secure calls can be placed to other STE phones. The STE system is designed so that when the STE set and the Crypto Card are separated, neither is considered classified. STE phones are "releasable" (unlike STU-III sets). All cryptographic algorithms are in the Fortezza Plus card.

There are upgrade kits available that allow STE sets to communicate with systems that use the Secure Communications Interoperability Protocol (SCIP) (formerly Future Narrowband Digital Terminal (FNBDT)).

• Office - The Office STE is the most widely STE in use and provides voice and data access to ISDN (Integrated Services Digital Network) and PSTN (Public Switched Telephone Network) telecommunications systems.
• Tactical - The Tactical STE is similar to the Office STE but can also access the TRI-TAC (TRI Service TACtical) network and has a serial EIA-530A/EIA-232 BDI (Black Digital Interface) port.
• Data - The Data STE provides remote access for voice, fax, data and video-conferencing. This model has two serial EIA-530A/EIA-232 BDI ports and allows for data transfers to multiple destinations.
• C2 - The C2 STE is similar to the Tactical STE but C2 has modified software for use with its Tactical Terminal Locking Handset mechanism.
• STE-R - Similar to the Data STE, the STE-Remote provides dial-in access to the Defense Red Switch Network (DRSN).
• VoIP - The STE now has VoIP capability, available as an upgrade to the current models, or built-in to new models.

• U.S. Government Secure Wired Products website
• L-3 Communications STE Site
• L-3 Communications VoIP STE site