STU meaning in Military and Defence ?

Answer: What is Secure Telephone Unit mean?

Secure Terminal Equipment (STE) is the U.S. government's current (as of 2008), encrypted telephone communications system for wired or "landline" communications. STE is designed to use ISDN telephone lines which offer higher speeds of up to 128 kbit/s 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 is intended to replace the older STU-III office system and the KY-68 tactical system. STE sets are backwards compatible with STU-III phones, but not with KY-68 sets.

STE sets look like ordinary high-end office desk telephones and can place unsecured calls to anywhere on the public switched telephone network (PSTN), as well as secured calls on it via the phone's backwards compatible STU-III mode. There is a PC Card slot in the STE that allows a Fortezza Plus (KOV-14) Crypto Card or KSV-21 Enhanced Crypto Card to be inserted. When an NSA configured Crypto Card is present, secure calls can be placed to other STE phones. STE phones are "releasable" (unlike STU-III sets). All cryptographic algorithms are in the crypto card.

Newer STE sets can communicate with systems that use the Secure Communications Interoperability Protocol (SCIP) (formerly Future Narrowband Digital Terminal (FNBDT)). There are upgrade kits available for older units.

reference

Full Form	Category
St. Thomas University	Academic & Science
Saint Thomas University	Academic & Science
SRAM Technical University	Academic & Science
Saigon Tech University	Academic & Science
The Student Loan Corporation	Business
Strategic Technology Unit	Business
Special Team Unit	Business
Singapore Teachers Union	Business
Secure Terminal Unit	Computer and Networking
SHDSL Transceiver Unit	Computer and Networking
Sonic Timeworks Utilities	Computing
Streaming Tape Unit	Computing
System Testing Unit	Computing
Stuart	General
Shepherdnick Tobeon Updates	General
Street Touring Ultra	General
Slovenská technická univerzita	General
Supervision Training Units	General
Shock Treatment Unit	General
Set Top Unit	General
So Turnt Up	General
Stamina Training Unit	General
Scoville Thermal Units	General
Stupid Talking Unit	General
Smart Telecontrol Unit	General
State Transport Undertaking	General
Separate Technical Unit	General
Steem Token Unit	General
Short Term Unemployed	General
Secure Telephone Units	General
Subaqueous Twinpedal Unit	General
Same To U	General
Shut The Up	General
Student Transport Unit	General
Studebaker	General
State Transmission Utility	Governmental
Support The Uprise	Governmental
Scent Transfer Unit	Governmental
Special Task Unit	Governmental
Sorry, Time's Up	Internet
Space Time Unit	Measurement Unit
Secure Telephone Unit	Military and Defence
Studio	Real Estate
Santa Cruz, Belize	Regional
Shuttle Test Unit	Space Science
Special Test Unit	Space Science
Star Tracker Unit	Space Science