3-Card Shelf Configurations

Single 3-card HVI Cabinet and Backboard with Power Supply Housing

The Teleline Isolator 3-card Shelf HVI Cabinet Assembly, Model 751980/15 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.

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

3-card Shelf HVI Backboard Assembly


This HVI assembly provides high voltage isolation for six (6) cable pairs entering a site and features the following:

  • IEEE 487 compliant
  • Teleline Isolator 3-card Shelf, Model 751127, 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 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 with fire-proof paint:
    • Plywood backboard coated with fire-proof paint
    • Remote Ground Potential region designated in bright red
    • Station Ground Potential region designated in white
  • Station-side terminal block equipped with balanced, solid-state secondary protector modules
  • 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 shorting are provided for trouble-shooting purposes
  • Dedicated incoming cable protected by pre-installed 15kV lightning arrestor
  • HVI assembly provided with:

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

751980/15Single 8-card Shelf HVI CabinetUser guide
751980/05Single 3-card HVI Backboard with Power Supply HousingUser guide