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Chapter 6: Configuring Advanced Features
Step
4
Configure the following parameters:
• Mode
The four mode options are: CPE-2Wire, CPE-GS4Wire, CO-2Wire, and CO-GS4Wire. The default for
MM702G2-W is CPE-2Wire.
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
Extension" on page
• Annex Type
Select one of the following Annexes:
– Annex-A for operating conditions typically found in the North American implementation of G.shdsl
– Annex-B for operating conditions typically found in the European implementation of G.shdsl.
– 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. Default is Auto.
• Bit Rate Mode
Indicates how the modem synchronizes with the device to which it is attached in either a Fixed or
Adaptive mode. The default for the modem is Adaptive 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, 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. Default is Adaptive.
• Min Bit Rate – In 2-wire mode, the default minimum bit rate is 64 Kbps. In 4-wire mode, the default
minimum bit rate is 384 Kbps.
• Max Bit Rate – In 2-wire mode, the default maximum bit rate is 2304 Kbps. In 4-wire mode, the
default maximum bit rate is 4608 Kbps. NOTE: The minimum and maximum bit rates have to be the
same in 4-wire mode for fixed rate operation.
• Startup Margin
The target signal-to-noise margin, in decibels, that the modem must achieve with a BER of 10
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. Possible values are -10dB
through 10dB, or to completely Disable the margin. Default is -10dB.
6-60
Action
8-1.
"Implementing a Point-To-Point LAN
MM702G2-W-UM-03
-7
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