JDS Uniphase OneExpert DSL, Руководство пользователя

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Chapter 4 DSL Testing
Specifying test settings
OneExpert DSL User’s Guide
April 2014 22052280, Revision 001
37
Specifying test settings
Before you begin testing, make sure the test settings on the OneExpert DSL OneExpert DSL match
the settings of the line that you are testing.
• To access the setup screen, select the Setup & Tests system key.
Loading a test profile
If you have previously specified the settings and saved the test profile, you can load that profile so
you don’t have to specify all of the settings again.
To load a saved profile
1 Touch the Load button.
A list of Modem Settings profiles appears. (If no profiles have been saved, the list will be
empty.)
2 Select the profile to load.
The settings are loaded.
Specifying DSL settings
1 Touch the Modem Settings button.
2 Select DSL Interface and then specify whether to use the RJ45 connector or T/R/G (Tip/
Ring/Ground) as the DSL interface.
3 Select xDSL Technology , and then select VDSL , ADSL , or xDSL (Auto) . The Auto setting
queries the DSLAM for the technology.
4 The Analog Technology is automatically set to xDSL over POTS.
5 Do one of the following:
–
If you selected ADSL as the Technology, select Standard & Annex and then specify the
ADSL standard and annex (such as GLite AnnexA or ADSL2+ Annex M).
– If you selected VDSL as the Technology, specify the VDSL Profile (such as 8A or 12B).
6 If you selected either VDSL or Auto as the Technology, select VDSL Vectoring and specify
Full , Friendly , or Off .
Vectoring technology is used on VDSL2 connections to reduce FEXT from other pairs in a
binder group resulting in higher downstream and upstream rates for all the pairs in the group.
Vector mode is available for single-line VDSL circuits only (not available for bonded, not avail-
able for ADSL2). Vector Friendly mode is suggested when there is a need to emulate CPE
incapable of full vectoring, but which have been designed to synchronize to a vectoring
DSLAM without losing sync. It is a special software that is downloaded to the VTU-R modem
enabling it to respond to a vectored request from a VTU-O to allocate net data rates across all
bearer channels and to minimize excess SNR per channel.
7 Select Transport Mode , and then specify ATM, PTM, or Auto. This specifies whether data is
transported over Asynchronous Transfer Mode (ATM) or Packet Transfer Mode (PTM). The
Auto setting queries the DSLAM for the transport.