Chapter 6 DSL Testing
Specifying test settings
SmartClass TPS User’s Guide
54 22035456, Rev 001 June 2014
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.
– If using vectoring, the Data network must be enabled and configured because the data layer
is used to communicate parameters between the DSLAM and modem during showtime.
7 Select SOS Mode and then specify whether to use SOS mode.
This setting is only applicable to VDSL.
When enabled, SOS mode ensures that a connection is maintained on the DSL link regardless
of suddenly degraded conditions (such as large increases in noise or a large degradation in
SNR) and allows the application to maintain at least a minimal connection during a period of
degradation. SOS mode can prevent retraining, allowing a more graceful return to normal
operation when the period of degradation has ended.
8 Press Cancel to return to the DSL Summary results menu.
Specifying DSL settings for Bonded mode (For BCM96368 modem only)
To specify Bonded DSL test settings
1 From the ADSL Bonded or VDSL Bonded menu, select ADSL or VDSL.
The Group Summary results menu appears.
Press the asterisk (*) to view the Setup menu.
2 Do one of the following:
– If you are testing ADSL Bonded, select ADSL Modulation and then choose ADSL2,
ADSL2+, Annex M, or Auto. Auto will query the DSLAM for the modulation.
– If you are testing VDSL Bonded, select VDSL Profile and then choose a profile. Auto will
query the DSLAM for the modulation.
3 Select Transport Mode and then choose ATM, PTM, or Auto. Auto will query the DSLAM for
the transport mode.
4 Select SOS Mode and then specify whether to use SOS mode.
This setting is only applicable to VDSL.
When enabled, SOS mode ensures that a connection is maintained on the DSL link regardless
of suddenly degraded conditions (such as large increases in noise or a large degradation in
SNR) and allows the application to maintain at least a minimal connection during a period of
degradation. SOS mode can prevent retraining, allowing a more graceful return to normal
operation when the period of degradation has ended.
5 Press Cancel to return to the Group Summary results menu.
Specifying network settings
If the modem operation mode is Bridge (which is the default mode), the Network Setup is available.
If using Router mode, specify the WAN Setup.
NOTE:
When testing on a line that is configured for vectoring, the time to achieve showtime may be lon-
ger than a VDSL2 line without vectoring because it takes additional time to negotiate with the
DSLAM while assessing all of the pairs for cross-talk.
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