ADC MM701G2, MM702G2 user manual Operating Mode

April 14, 2006 Appendix A: Command Line Interface Access

Step Action

2Configure the following parameters as directed by your service provider:

•Operating Mode

Type 1 then select 1 for Remote and 2 for Central-Office.

When the modem is connected to a service provider through a DSLAM, the operating mode is Remote (default setting). When two modems are used in a point-to-point application (LAN extension, for example), one modem at the customer or user site is set to Remote, and the second modem in the CO or wiring closet is set to Central-Office. For instruction on setting up G.shdsl parameters and other related parameters for a point-to-point modem application, go to Chapter 7: Implementing a Point-To-Point LAN Extension.

•Standard Annex

Type 2 then select one of the following Annexes:

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

2—Annex-B for operating conditions typically found in the European implementation of G.shdsl. This is the default mode for the MM701G2 modem.

3—Auto for automatically negotiating the Annex A or B standard by which this modem, and the device to which this modem is attached, can operate.

•Startup Margin

Type 3 then select a number from 1 to 21 for possible values between -10dB through 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 -10 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 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 124), 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 the new configuration for the G.shdsl settings.

MM70xG2-UM-03 A-19