ZyXEL Communications Prestige 642 User Manual page 154

Prestige 642 ADSL Internet Access Router
The Prestige supports "Multi-Mode", G.dmt, G.Lite, ANSI T1.413, and "Normal Open" ADSL operational
protocols.
Please note that not all P642 firmware versions support all standards!
Multi-Mode
Normal Open.
ANSI T1.413
Full Rate (G.dmt)
G.Lite
xxii
These both refer to the way the Prestige detects which operational protocol the
DSLAM (Digital Subscriber Line Access Multiplexer) is using and adjust
automatically. The DSLAM is a network device, usually at a telephone company
central office, that receives signals from multiple customer Digital Subscriber
Line connections such as the Prestige and puts the signals on a high-speed
backbone line using multiplexing techniques.
The ANSI T1.413 Issue 2 is the American version of the ITU G.dmt standard, i.e.,
full rate ADSL.
Full rate ADSL, with transmission speeds of up to 8 Mbps downstream and 646
Kbps upstream, was originally intended for video applications but is now also
targeted at bringing high-speed Internet access to residential and small business
users.
The Universal ADSL Working Group (UAWG) developed the G.Lite/DSL Lite
standard (also referred to as "splitterless" DSL or as Universal DSL) to create a
universal, splitterless, and therefore easy to install lower-speed version of ADSL.
The G.Lite version of ADSL is capable of providing transmission speeds of 1.536
Mbps downstream and 512 Kbps upstream (still 8 to 10 times faster than ISDN).
Standards
Standards