Line
Status
Motorola, Inc.
549453-001-00-a
Page 45 of 51
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Operators can view extensive details about DSL line characteristics from the CLI, Port Monitor web page, or SNMP.
To view line characteristics using the webUI, click on DSL Monitor, then click the + sign to expand the port you wish to
view.
Using the Port Monitor web page, the operator can quickly scan the status of all ports in the system. A color coded
grid indicates the important status of each port e.g. GREEN indicates the Ethernet port is connected, whereas GREY
indicates the port is enabled, but disconnected.
Per line details visible:
Status
Options are self-explanatory: disabled, enabled, linking, link lost, linked.
Quality
Link quality is a measurement of bit errors per second. Options are: Good, Fair, Bad. mT2
includes Forward Error Correction in the VDSL frames. Bit errors that are not corrected are
counted and reported as a Line Quality measurement.
Bit errors of 0 – 0.51 per second = Good
Bit errors of 0.51 - 1 per second = Fair
Bit errors of greater than 1 per second = Bad
Portx
Where “x” is the number of a remote Ethernet port on the WallPlate. Shows the status of the
remote Ethernet port. Options are: connected, disconnected, disabled.
Downstream
Displays the line bitrate in the downstream direction in Mbits/second.
Upstream
Displays the line bitrate in the upstream direction in Mbits/second.
SNR DSx
SNR USx
Where “x” is 1 or 2. mT2 uses a 4-band QAM modulation. Three of the 4 bands are used by
mT2 to maximize downstream line bitrate. DS1 and DS2 refer to the two downstream bands;
whereas US1 refers to the single upstream band. If a band shows 0 SNR, the band is not
being used by that line. During normal operation, it will be common to see 0 SNR on DS2.
US2 will always show 0, this is normal. SNR can be used to diagnose line issues, but must be
considered in concert with other parameters. Values are in dB.
Margin DSx
Margin USx
Each band requires SNR to be reserved as for margin. Typical values of SNR margin is
between 6 and 9. If margin is lower than 6, the line may have low quality and may retrain at
any time. If margin is greater than 9, the line is capable of a higher bitrate. Any band that is
not being used will show a margin of 0. Values are in dB.
Distance (m)
Distance value shows estimated line length in meters, based on the level of the attenuated
signal. Distance is accurate within 10% over 150m. Measurements below 150m are
displayed at <150.
