User:KD5TVI/test

Joint Tactical Communication (TRI-TAC) Program
Between 1967 and 1969, the United States, along with the United Kingdom, Canada, and Australia, sought to develop an interoperable communication system. The effort was known as Project MALLARD. The system design was agreed upon by all parties in 1969. Shortly thereafter, the United States pulled out of the project.

The Senate Armed Service Committee had recommended that a system be developed "without the complications of active international participation". In February 1971, the Joint Tactical Communications (TRI-TAC) Program was approved with the goal of:


 * 1) Interoperability
 * 2) Communications commonality
 * 3) Centralized management of telecommunications
 * 4) Cost

Switching and Control (Rewrite)
The AN/TTC-39 circuit switch was the prime piece of equipment used for TRI-TAC switching and control. The AN/TTC-39 was built by GTE-Sylvania in a 300-line and a 600-line configuration. A companion switch, the AN/TYC-13 (GTE-Sylvania), was also utilized and was built with a 25 or 50-line configuration.

The United States Marine Corps utilized the AN/TTC-42 switch, built by ITT, which came in a 75 or 150-line configuration.

The smallest switching device was the SB-3865 Unit Level Automatic Switchboard, capable of handling 30 lines but stackable to 60 or 90 lines and interoperable with the TTC-42.

Transmission
Connectivity to other switching nodes was accomplished utilizing multichannel UHF and SHF radios.


 * AN/TRC-170 - Tropospheric scatter terminal with a maximum range of 200 miles. Developed by Raytheon.
 * AN/TRC-175 - UHF line-of-sight Multichannel Terminal