ZyXEL Communications Prestige 642 - Manual (Page 154)

Prestige 642 ADSL Internet Access Router
xxii Standards
Standards
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.
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.
ANSI T1.413 The ANSI T1.413 Issue 2 is the American version of the ITU G.dmt standard, i.e.,
full rate ADSL.
Full Rate (G.dmt) 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.
G.Lite 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).