Motorola T3 Panduan Pengguna - Halaman 46
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Halaman Cetak
Line Status
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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:
Options are self-explanatory: disabled, enabled, linking, link lost, linked.
Status
Link quality is a measurement of bit errors per second. Options are: Good, Fair, Bad. T3
Quality
includes Forward Error Correction in the VDSL frames. Bit errors that are not corrected are
counted and reported as a Line Quality measurement.
Where "x" is the number of a remote Ethernet port on the WallPlate. Shows the status of the
Portx
remote Ethernet port. Options are: connected, disconnected, disabled.
Displays the line bitrate in the downstream direction in Mbits/second.
Downstream
Displays the line bitrate in the upstream direction in Mbits/second.
Upstream
Where "x" is 1 or 2. T3 uses a 4-band QAM modulation. Three of the 4 bands are used by T3
SNR DSx
to maximize downstream line bitrate. DS1 and DS2 refer to the two downstream bands;
SNR USx
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.
Each band requires SNR to be reserved as for margin. Typical values of SNR margin is
Margin DSx
between 6 and 9. If margin is lower than 6, the line may have low quality and may retrain at
Margin USx
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 value shows estimated line length in meters, based on the level of the attenuated
Distance (m)
signal. Distance is accurate within 10% over 150m. Measurements below 150m are
displayed at <150.
Motorola, Inc.
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
570510-001-00 rev A
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