1-17920-A2-GB20-10 August 1997About HotWire Models 7924 and7925 Nest Card Termination Units1HotWire Model 7924 and 7925 FeaturesProducts in the HotWire 7900 family provide “last mile/last kilometer” transport ofT1- and E1-compatible circuits between customer facilities and central-siteequipment over 2- or 4-wire copper lines. These termination units can be usedover distances substantially exceeding traditional T1 and E1 spans and EuropeanTelecommunications Standards Institute (ETSI) loop standards.This chapter provides a general overview of the HotWire Models 7924 and 7925nest card termination units, including standalone units (A1) and nest-mountedtermination units (B1).HotWire Model 7924 Standard Features DSX-1 interface Full support for T1 using two twisted-copper pairs Full support for fractional T1 using one or two twisted-copper pairs Meets the requirements of repeaterless T1 transmission on loops exceedingstandard specifications Automatic detection of and compensation for inverted pairs andswapped loops, significantly simplifying installation Local and remote alarm surveillance Local and remote T1 and HDSL performance monitoring