Single 5-card Shelf HVI Cabinet
w/Integrated 4-slot NIU Shelf

The Teleline Isolator 5-card Shelf HVI Cabinet Assembly, Model 751960/15CU5 provides a safe, reliable, cost effective solution for isolating wireline communication circuits entering sites susceptible to high voltage influences due to Ground Potential Rise (GPR) caused by lightning and/or power faults. The NEMA 4X rated, non-metallic, lockable cabinet assembly is suitable for outdoor installation.

This HVI assembly offers the additional feature of single 4-slot DTWA mounting pre-wired into the Station-side connections. Housing NIU plug-in cards, the DTWA is connected between the Station Side of the Teleline Isolator shelf and the Station Side solid-state secondary protector block, providing protection to the NIU from differential mode electrical disturbances that can occur on the Station Side communication pairs inside the substation.

Product Number CLEI Code Description Download Documents
751960/15CU5   Single 5-card Shelf HVI Cabinet
w/Integrated 4-slot NIU Shelf
Installation Guide

HVI backboard assembly

The Teleline Isolator offers 70kV peak, 50kVrms protection on each communication circuit, while permitting continuous communications before, during, and after a GPR event.


This HVI backboard assembly provides high voltage isolation for ten (10) cable pairs entering a site and features the following:

  • IEEE 487 compliant
  • Pre-installed, electrically protected single 4-slot DTWA assemblies for NIU insertions
  • Teleline Isolator 5-card Shelf, Model 751112/15, certified to Safety Standard 60950, equipped to provide integrated Span Power for ADTRAN Total Reach®, HDSL and T1 terminating units
  • NEMA 4X rated non-metallic cabinet is equipped with:
    • Internal fan, with particle filter, for cooling and maintaining a positive interior pressure to minimize dust infiltration
    • Humidity sensor, thermostat and heat strip to maintain a controlled internal environment
    • AC utility power outlets
  • Entire assembly comes pre-wired to ensure dielectric separation of station and remote ground potential components, ensuring a safe and IEEE compliant installation
  • Equipment mounted on a ¾ inch (2 cm) thick plywood backboard securely mounted inside the cabinet
    • Plywood backboard coated with fire-proof paint
    • Remote Ground Potential region designated in bright red
    • Station Ground Potential region designated in white
  • Connections to dedicated incoming communication cable (Remote Ground Potential) made via wire-wrap to ADC® high voltage isolation modules with looping jacks providing 20kV of isolation
    • Additional isolation jacks for circuit polarity reversal and circuit looping are provided for trouble-shooting purposes
  • Dedicated incoming cable protected by pre-installed 15kV lightning arrestor
  • HVI assembly provided with:

Note: * For integrated Span Power applications, use power supply 751318MC or 751319MC


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