product overview

The Single-Line Performance Test in ID-337 requires a test instrument that replicates the Home Network Bridged Tap Test Loop Topology found in the standard. This topology consists of an isolated drop wire from the street to the house, known as the Network Termination Point (NTP). It also depicts in-home wiring of twisted pair cabling to 5 rooms, with the CPE connected in the room 20m away from the NTP. The other rooms are 2m, 2.5m, 5m, and 10m away from the NTP creating 4 bridged taps that are not electrically terminated and result in signal reflections of the Gfast signal traveling on each path. This produces attenuation distortion or “nulls” in the attenuation curve, based on the length of wire in each of the bridged taps. This “star” configuration affects the frequency bands used by Gfast (see diagram on next page). The HNBT-Starbox is a cable-based solution that uses CAD55 cable and provides the required test loop topology in one compact unit.

The HNBT-STARBOX connections for ID-337 testing.

Specifications