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Configuring the ADSL Line Interfaces
Configuring ATM ADSL-DMT interfaces
Overview of the AL-DMT profile
Various discrete multitone (DMT) standards define the fast and interleaved data
latencies for each direction (upstream and downstream) of ADSL transmission. In the
Stinger AL-DMT profiles, you set parameters to specify the data rate, signal quality
and power, and data delay of the interface. The Stinger MRT unit uses these
parameters in the training process.
The following sets of parameters are active in the current software version:
Line activation and DMT parameters
Rate adaptive mode parameters
Power spectral density (PSD) and power-level parameters
Fast and interleaved bit-rate parameters
Interleaving delay parameters
Noise margin parameters
Dynamic rate adaptive parameters
Trellis encoding
Automatic gain control
The following ADSL-DMT features are not currently supported:
Dual latency
Dynamic rate adaptation
These features are not present in the current software version. However, the
parameters related to these features are present in the AL-DMT profile.
ADSL protocol support
The Stinger MRT supports the following protocol standards:
ANSI T1.413 Issue 2—full rate
ITU G.992.1—G.dmt
ITU G.992.2—G.lite
ITU G.994.1—G.hs
ITU G.997.1—physical layer management
By setting the line-code parameter in the Line-Config subprofile to auto-select,
the Stinger MRT automatically detects and configures itself with the correct ADSL
protocol. This is the optimum setting for the Stinger MRT.
No matter which protocol is used, in general, the AL-DMT profile parameters remain
the same and are configured in the same way. Exceptions are the line-latency-down
and line-latency-up parameters. When the G.lite protocol is specified or detected,
these parameters are automatically set to the value interleave.
Line activation and DMT parameters
Each direction of traffic (upstream and downstream) on an ADSL-DMT line can have
a different minimum and maximum bit rate. The unit does not support dual latency,
which can use both the fast and interleaved channels in both directions.
7-2
Stinger® MRT Getting Started Guide
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