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Chapter 6: Configuring the Ports
Megabit Modem 410F and 420F User Manual 53
2 Configure the ADSL startup parameters.
3 Configure the SNR margin threshold.
The Startup Option determines how an ADSL transmission rate is established when
the modem is reset. The following table describes the available options.
Startup Option Description
Adaptive at Startup
(default)
The modems attempt to come up at the downstream and upstream
Max Data Rate (kbps) with a margin greater than or equal to the
Startup SNR Margin. If the data rates cannot be obtained, the
modems attempt lower data rates that are greater than or equal to
the downstream and upstream Min Data Rate (kbps) until sync
occurs. If the modems do not achieve the rates, they will not sync.
Fixed The modems attempt to come up only at the downstream and
upstream Max Data Rate (kbps) values with a margin greater than
or equal to the Startup SNR Margin. If the data rates cannot be
obtained, the modems continue to attempt the data rates. If the
modems do not achieve the rates, they will not sync.
Enter the Startup SNR Margin. The value can be any number between 0 and 15 dB.
The default is 4.
Startup SNR (Signal to Noise Ratio) margin is the margin the modem must achieve
to come up.
Enter the Margin Threshold. The value can be any number between 0 and 15 dB. The
default is
3.
The margin threshold determines the SNR margin value below which the ADSL
MAR LED on the modem front panel turns off.