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Commander's Tactical Terminal (CTT) AN/TSC-125

The Commander's Tactical Terminals (CTT) provide the war fighter with seamless, near-real-time intellegence and targeting information. They supply the critical data link to battle managers, intellegence centers, air defense, fire support and aviation nodes across all services. The CTT allows Army, Air Force, Navy and Marine Corps users to exploit multiple intelligence broadcast networks.

The AN/TSC-125 Commander's Tactical Terminal (CTT) is a single-channel, anti-jam, COMINT/ELINT tasking and reporting transmitter/receiver designed for near-real-time dissemination of tactical intelligence. The purpose of the CTT is to provide the capability of selected Army and Air Force airborne collection systems to forward perishable intelligence to deep close and rear operations centers.

The Joint Tactical Terminals (JTT) and the Commander's Tactical Terminal (CTT) provide the joint war-fighter with near-real-time tactical intelligence and targeting information. The terminals supply the critical data link to battle managers, intelligence centers, air defense, fire support and aviation nodes across all services. The terminals allow Army, Air Force, Navy and Marine Corps users to exploit Integrated Broadcast Service (IBS) networks: Tactical Reconnaissance Intelligence eXchange Service (TRIXS), Tactical Information Broadcast Service (TIBS), Tactical Related Applications (TRAP), and Tactical Data Information eXchange System-B (TADIXS-B). In addition to receiving intelligence data, JTT and CTT transmit TRIXS or TIBS data. The CTT and other IBS terminals are migrating to a single JTT family.

The CTT terminals shall be capable of service in a tactical, sheltered military environment aboard helicopters, jet and propeller driven aircraft, and wheeled and tracked vehicles. The CTT terminals shall be capable of being integrated into host systems in accordance with the System/System Segment Interface Control Document for the Commanders' Tactical Terminal Hybrid Host CTT3, A3112228-003. All operator selectable functions shall be through the host system interface. The CTT Frequency range shall be 225 MHz to 400 MHz. Channels shall be 5 kHz and 25 kHz. The CTT shall provide HAVE Quick II (HQII) frequency hopping control and be frequency and bandwidth compatible with other HQII systems. The CTT system shall operate simultaneously with any number of HAVE Quick II nets without mutual interference.

CTT hardware is incorporated into both ground and airborne systems and consists of four major sub-components: a Communications Terminal (CT), a Radio Relay System (RRS) on board the RC-12 and U2-R aircraft, a Radio Relay Test Set (RRTS) used to support pre-flight checks and a Security Data System (SDS) located in the Ground Processing Facility (GPF).

  1. The communications terminal is a stand alone system consisting of four components: an Operators Terminal (OT); Red/Black Processor (RBP); Radio Receiver Transmitter (RRT); and an adaptive array line of sight antenna. The CT provides simultaneous, secure full duplex data and half duplex voice communications between ground processing facilities and mobile, tactical field units. Messages/reports are transmitted over the Tactical Reconnaissance Intelligence Exchange System (TRIXS) net and are in USMTF format. The GPFs are the U.S. Air Force Contingency Airborne Reconnaissance System (CARS) deployable Ground Station (DGD), and the U.S. Army GUARDRAIL/Common Sensor (GR/CS) Integrated Processing Facility (IPF).
  2. The RRS, AN/ARW-85, is comprised of an UHF radio receiver and transmitter, signal data translator, and rack/harness assembly. The function of the RRS is to receive the uplink data for retransmission on UHF and receive UHF data for downlink to the Ground Processing Facilities (GPF). CTT airborne relay subsystems are located on board the Air Force U2-R and the Army RC-12 aircraft.
  3. The SDS, AN/GYQ-65, provides message accountability, user authentication, discetionary access, and an audit log and analysis capability necessary to meet national agency accreditation requirements for operation in a system-high environment. The SDS is comprised of a computer terminal, monitor, keyboard, printer, and removable disks.
  4. The RRTS, AN/URM-214, supports pre-flight checkout, operational verification, and fault isolation of the RRS. The RRTS is located on flightlines at relay platform ground sites and is comprised of a receiver/transmitter test group and a test controller and cable/case assembly.

There are three CTT configurations that are used in conjunction with the Tactical Reconnaissance Intelligence Exchange System (TRIXS), Tactical Information Broadcast Service (TIBS), Tactical Receive Equipment (TRAP) Data Distribution System (TDDS), and Tactical Data Information Exchange System-Broadcast (TADIXS-B) dissemination networks.

The CTT-1 is a stand-alone, single-channel transmitter and receiver (full duplex data and half-duplex voice) system which operates either SCI or SECRET collateral in the TRIXS network only. Currently, U.S. Army, Europe, has fielded 7 CTT-1 systems and U.S. Forces Command has 16 CTT-1s.

The CTT-2 is a two-channel receive-only system which can receive any two of the four broadcast networks simultaneously. A component part of a larger system, more than 180 CTT-2s have been fielded to Air Force and Army units. This is the system currently integrated into the JSTARS LGSMs and MGSMs.

The CTT-3 is a three-channel full duplex transmitter and receiver. It can receive three broadcast intelligence networks simultaneously and adds the capability to transmit and receive secondary imagery. Delivery of the first seven systems will be in June 1996; three of them will be installed in MGSMs in Korea. Total production of the CTT-3 will be 86 CTT-3 transmitter-receivers, with 37 going to the Army, 26 to the Marine Corps, and 16 to the Navy.

The CTT3 has two system configurations:

CTT/H-3. The CTT/H-3 , AN/USR-5 is a full duplex terminal that consists of 2 line replaceable units (LRUs), a red/black processor (RBP), and a radio receiver/transmitter (RRT). The CTT/H3 is configurable to operate as a relay terminal (aka GPF terminal) in the Army GR/CS IPF or Air Force CARS DGS, a full-duplex field terminal, or an airborne relay terminal (including radio relay system (RRS) functions) in the EP-3 Storyteller System in the Tactical Reconnaissance Intelligence Exchange System (TRIXS) network. It can also operate as a Master, Manager, Data Provider, or Query Terminal in the Tactical Information Broadcast Service (TIBS) Network, or as a full- or half-duplex general purpose link (GPL) for the Army while simultaneously receiving two channels of the TENCAP Secondary Imagery Dissemination (SID), TRIXS, TIBS, GPL-SID, TRAP Data Distribution System (TDDS), and/or Tactical Data Information Exchange System-B (TADIXS-B).

CTT/H-R3. The CTT/H-R3, AN/USR-6 consists of a single LRU that is the receive-only version of the CTT/H3. The CTT/H-R3 is configurable to simultaneously receive three channels of intelligence data from TRIXS, TIBS, GPL-SID, TDDS, and TADIXS-B in any combination.


  • Components:
    • Communications Terminal
      • ' Red/Black Processor
      • ' Radio rcvr/xmtr (RRT)
      • ' Operator's Terminal
      • ' Antenna array
    • Radio relay system
    • Radio relay Test set
    • Security data system - Embedded COMSEC
  • Flexibility:
    • . Quick erect antenna
    • . Mobile operations
    • . Mountable in:
      • ' fixed/rotary wing aircraft
      • ' track/wheeled vehicles
      • ' shelters
  • . 19 in. Rack mountable - Total weight (RBP, RRT, OT) 225 lbs.
  • Transmit/Receive:
    • . SECRET & SCI level
    • . NRT FD digital data & HD voice
    • . 300 Msg/hr from IPF
    • . ASCII Based (BIT or character messages)
    • . Text based (BIT & character messages)
    • . Selective address up to 100 field addresses
    • . Built-in EP functions (HQ II) and steerable null antenna

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Page last modified: 28-07-2011 00:48:37 ZULU