Loop Simulator Handy for DSL Testing

Aiding in schools' network and high-speed access installations, Telebyte Inc.'s Model 454 Local Loop Simulator is a compact laboratory and production test unit that precisely simulates the frequency response of the local loop used by telephone companies. It presents an accurate simulation of both the amplitude and propagation delay characteristics of a single, 26 AWG (0.4mm) telephone pair at frequencies extending from DC up to 1.5 MHz. This is the frequency range of ADSL technology, used to provide high speed Internet access over a local loop.

The unit emulates local loops extending up to a maximum of 18,500 feet. For enhanced flexibility, Model 454 is comprised of separate sections that can individually simulate the characteristics of cable lengths of 500 feet, 1,000 feet, 2,000 feet and 3,000 feet. These sections can be connected in any combination to allow simulation in 500-foot increments of any cable length up to 18,500 feet. Tandem connection is accomplished with front panel push-button switches. In addition, by employing multiple units, ADSL modems can be tested in configurations with bridge taps.

Model 454 is completely passive, requiring no AC power, which makes it a very portable tool. It is equipped with two bi-directional ports, supporting both 400 Volt levels and 120 mA DC current. Telebyte, Inc., Greenlawn, NY, (800) 835-3298, www.telebyteusa.com.

Featured

  • female technology director leading a meeting

    Navigating the First Year as a Female Technology Director: A Journey of Leadership and Empowerment

    For women in the landscape of technology leadership, the first year is both a proving ground and a powerful platform. It's a year of listening deeply, learning quickly, leading boldly, and paving the way for others.

  • toolbox featuring a circuit-like AI symbol and containing a screwdriver, wrench, and hammer

    Microsoft Launches AI Tools for Educators

    Microsoft has introduced a variety of AI tools aimed at helping educators develop personalized learning experiences for their students, create content more efficiently, and increase student engagement.

  • horizontal stack of U.S. dollar bills breaking in half

    ED Abruptly Cancels ESSER Funding Extensions

    The Department of Education has moved to close the door on COVID relief funding for schools, declaring that "extending deadlines for COVID-related grants, which are in fact taxpayer funds, years after the COVID pandemic ended is not consistent with the Department’s priorities and thus not a worthwhile exercise of its discretion."

  • three main icons—a cloud, a user profile, and a padlock—connected by circuit lines on a blue abstract background

    Identity Has Become a Critical Security Perimeter for Cloud Services

    A new threat landscape report from Fortinet points to new cloud vulnerabilities. According to the company's 2025 Global Threat Landscape Report, while misconfigured cloud storage buckets were once a prime vector for cybersecurity exploits, other cloud missteps are gaining focus.