3-4. Subscriber Terminal Equipment

The supporting signal battalion provides the users access to the ACUS. The users provide their own terminal equipment and ensure it is functioning properly. The maneuver signal officer ensures equipment maintenance is scheduled and performed.

A sampling of this equipment includes--

• DNVT, TA-1035/U or TA-1042A/U.
  
• DSVT, TSEC/KY-68.
  
• MSRT, AN/VRC-97.
  
• Lightweight digital facsimile (LDF), AN/UXC-7/7A.
  
• CT, AN/UGC-144.

DNVT, TA-1035/U or TA-1042A/U. This is a 4-wire nonsecure telephone terminal that transmits and receives full duplex, conditioned diphase, digitized voice and loop signaling information. The DNVT (TA-1035/U) is the primary nonsecure voice/data terminal device used by static subscribers to access the MSE/TRI-TAC system via a SEN, usually collocated with a CP. The TA-1042A/G operates at 16 or 32 kbps. Most Army communications networks require terminal devices to be set at 16 kbps. The 32 kbps setting may be used to interface with joint/TRI-TAC switches (always verify the settings used with the local switch). The local switch provides power for the DNVT therefore no batteries are needed. The local switch also provides a nonsecure warning tone for the DSVT user if the user initiates the call to a DNVT; however, the tone stops as soon as the DNVT user answers the call. The user connects the DNVT by installing WF-16 field wire from the DNVT to a J-1077. The signal battalion's SEN team provides the J-1077. The user installs the field wire up to 4 kilometers. See Figure 3-29.

Figure 3-29. DNVT, TA-1035/U and field wire connections.

Technical Features.

• Input power voltage: +24 to +56 VDC.
  
• Input power: 300 milliwatts on-hook (power drain) 1.5 watts off-hook.
  
• Weight: 5 pounds 12 ounces.
  
• Compatible with: AN/UXC-7A, AN/UGC- 144, and DSVT.

  DSVT, TSEC/KY-68. This is a tactical telephone terminal with a built-in encryption/decryption module for secure traffic. It is a full-duplex voice and data interface terminal. It digitizes voice signals and transmits at 16 or 32 kbps. Most Army communications networks require terminal devices to be set at 16 kbps. The 32 kbps setting may be used to interface with joint/TRI-TAC switches (always verify the settings used with the local switch). Although used primarily for secure communications, the DSVT is interoperable with the DNVT. The traffic in this mode, in a protective environment, is secure at least at the SECRET level. The local switch provides the DSVT user with a warning tone when communicating with a nonsecure terminal; however, the tone stops as soon as the DNVT user picks up the handset. For data communications, the DSVT is equipped with a data port for encryption with various data devices such as MCS, tactical facsimile, and special circuits. See Figure 3-30.

  Figure 3-30. DSVT, TSEC/KY-90.
  

  The DSVT (TSEC/KY-68) is normally found in three configurations: static (wire), MSRT (mobile), and as stand- alone (static with the RT-1539). See Figures 3-31 and 3-32. Generally, DSVTs (in an MSRT configuration) are found with the commander, the S3 section, and the XO. It is a commander's prerogative on the actual locations of the DSVTs.

  Technical Features.
  

  • Input power voltage: +21 to +56 VDC.
    
  • Circuit Protection: DC - 4 fuses 1/2 ampere.
    
  • Weight: 14 pounds.
    
  • Compatible with: AN/UXC-7, AN/UXC-7A, AN/UGC-144, and DNVT.

    Continue with Chapter 3
    Table of Contents
    Index

    
    
    

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