Manage DSL

Standard Annex

Type 2 then select one of the following Annexes:

•1—Annex-Afor operating conditions typically found in the North American implementation of G.shdsl

•2—Annex-Bfor operating conditions typically found in the European implementation of G.shdsl. This is the default mode for the MM701G modem.

•3—Autofor automatically negotiating the Annex A or B standard by which this modem, and the device to which this modem is attached, can operate. This is the default mode for the MM702G modem.

•4—Annex-B_ANFPfor operating conditions that include the Annex B standard with Access Network Frequency Plan Pulse Spectral Density (PSD) mask.

•5—Auto_ANFPfor automatically negotiating the Annex A or B standard with Access Network Frequency Plan Pulse Spectral Density (PSD) mask.

Startup Margin

Type 3 then select a number from 1 to 21 for possible values between -10dBthrough 10dB, or select 22 to completely Disable the margin.The target signal-to-noise margin, in decibels, that the modem must achieve with a BER of 10-7or better to successfully complete synchronization. The default margin value is 6 dB. A lower margin may result in a higher data rate, but it can increase noise on the line.

Bit Rate Mode

Type 4 then select either 1 for Adaptive or 2 for Fixed mode. Bit rate mode indicates how the modem synchronizes with the device to which it is attached. The default for the MM702G modem is Fixed mode. The default for the MM701G modem is Adaptive mode. The following provides more description for each mode.

•Fixed mode indicates that the modem will synchronize with the other end (a DSLAM or another modem) at a fixed bit rate through negotiation. The modem will synchronize at the best rate, up to the data rate specified (page 122), that can be achieved by both ends.

•Adaptive mode indicates that prior to modem negotiating a rate, the modem performs an adaptation phase during which it determines a best possible rate based on conditions of the line. After adaptive mode, the modem will then negotiate the best rate that can be achieved with the other end, based on the adaptation results.

3Type 5 to Apply new configuration for the G.shdsl settings.

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MM701G and MM702G User Manual