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Chapter 4: Configuring the Modems
Megabit Modem 310F and 320F User Manual 21
Configuring the Startup Settings
You configure the Startup Option and Startup SNR Margin to establish how the modem comes
up to achieve a transmission rate after a reset (see page 26 for resetting the modem).
Select the Startup Option
1 From the ADSL Configuration Menu (page 20), type to select Startup Option.
2 Press the to sequence to the
Startup Option you want, then press .
The startup option determines how an ADSL transmission rate is established when
the modem is reset. The default is Adaptive Rate. The following table describes the
available options.
Select the Startup SNR Margin
1 From the ADSL Configuration Menu (page 20), type to select Startup SNR Margin.
2 Press the to sequence to the
Startup SNR Margin value you want, then
press .
The Startup SNR Margin is the margin that the modem must achieve to come up. The
available values range from 0 to 15 dB. The default is 4 dB.
You can configure these settings only from the Megabit Modem 310F for both
the Megabit Modem 310F and 320F. The fields are
Read Only Parameters
when you access them through the management interface for the Megabit
Modem 320F.
Startup Option Description
Adaptive Rate The modem comes up at the highest possible data rate based on the
configured startup margin and line conditions. Adaptive Rate is the default.
Fixed Rate At startup, the system attempts only the rates you configure in “Configuring
Data Rates” on page 22, which include maximum upstream and downstream
data rates with a margin greater than or equal to the configured margin. If the
data rates cannot be obtained, the system continues to attempt the data rate.
If it does not achieve the data rate, the modems will not sync.
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