ADC MM701G User Manual
Page 128
Manage DSL
120
MM701G and MM702G User Manual
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 MM701G 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. This is the
default mode for the MM702G modem.
•
4
—
Annex-B_ANFP
for operating conditions that include the Annex B standard with
Access Network Frequency Plan Pulse Spectral Density (PSD) mask.
•
5
—
Auto_ANFP
for 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
-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
-7
or 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.
3
Type
5
to
Apply new configuration
for the G.shdsl settings.