8700-A2-GB20-40 May 2002 1-11About Hotwire 8777 and 8779TDM SDSL UnitsTDM SDSL OverviewHotwire® Time Division Multiplexer Symmetric Digital Subscriber Line (TDMSDSL) products maximize customer service areas by varying the DSL line rate.This ensures symmetric DSL connectivity over a wide range of telephone linedistances and transmission line qualities. Hotwire 2-wire TDM SDSL productstransmit data over 14,000 feet (4.6 km) at rates up to 2.048 Mbps.Hotwire products support autorate. Units first synchronize to the highest line ratethat the 2-wire loop supports, then automatically configures the unit to the highestmultiple of 64 Kbps supported by that line rate. Eight line rates are available. At allrates, an 8 Kbps management channel is available, which enables functions suchas firmware downloads to remote units. Units can also be configured manually tofull or fractional T1 or E1 rates.
