User`s guide

A. Configuration Options
7990-A2-GB20-00 May 2002
A-3
Estimated Line Length
This value is usually specified by the carrier.
Possible Settings: Short, Medium, Long
Default Setting: Short
The estimated line length is the estimated distance from the local exchange to determine
the speeds that can be supported.
Estimated Line Length only appears when DSL Mode is set to STU-C and Spectrum
Management is enabled (see Table A-6, System Options).
Short – Can support speeds up to 2056 Kbps (in 64 Kbps increments).
Medium – Can support speeds up to 1480 Kbps (in 64 Kbps increments).
Long – Can support speeds up to 840 Kbps (in 64 Kbps increments).
Start Up Margin
Possible Settings: 0dB – 15dB
Default Setting: 4dB
Specifies the Signal to Noise Ratio (SNR) margin a port must exceed to successfully train
up with the remote unit.
0dB – 15dB – The Start Up Margin, in 1 dB increments.
Max DSL Rate
Possible settings depend on whether Spectrum Management is enabled, and which PSD
mask is being used.
Determines the maximum speed for the DSL line when in Adaptive Rate mode (Max DSL
Rate does not equal Min DSL Rate). See Table A-2, EIA-530 Payload Rates, for
information about maximum payload rates for different DSL line rates.
Max DSL Rate only appears when DSL Mode is set to STU-C and Spectrum
Management is enabled (see Table A-6, System Options).
Min DSL Rate
Possible settings depend on whether Spectrum Management is enabled, and which PSD
mask is being used.
Determines the minimum speed of the DSL line when in Adaptive Rate mode (Max DSL
Rate does not equal Min DSL Rate). See Table A-2, EIA-530 Payload Rates, for
information about maximum payload rates for different DSL line rates.
Min DSL Rate only appears when DSL Mode is set to STU-C and Spectrum
Management is enabled (see Table A-6, System Options).
Table A-1. DSL Interface Options (2 of 3)