ADTRAN 1245001L6, Руководство по установке и обслуживанию

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61245001L6-5G Section 61245001L6-5, Issue 7 9
A measure of signal quality for each HDSL loop is
displayed in graphic form on the bottom of the
screen. The measure is from 0 (poor signal quality)
to 9 (excellent signal quality). Guidelines for
interpreting the indicators are given below.
0 ......... Noise margin is
≤
0 dB (
≈
10
-7
BER)
1-8 ...... Margin measurement above 10
-7
BER in dB
9 ......... Margin is
≥
9 dB (excellent quality) above
10
-7
BER
The Provisioning Screen, illustrated in
Figure 12
, is
displays the existing provisioning parameters.
These parameters cannot be changed via software
but are represented on this screen to inform the
craftsperson of the provisioned parameters. Options
that can be changed via hardware settings are listed
with an asterisk (*).
Predicting performance based upon signal quality
varies with each loop. Generally, a noise margin of
0 or higher will support a bit error rate (BER) of
better than 10
-7
. ADTRAN has defined the
following as guidelines that correspond to the
operation of the HTU-C faceplate LEDs labeled
“LP1” and “LP2.”
Margin < 0 ( Red) ................... Poor Loop Quality
0
≤
Margin
≤
2 (Yellow) ......... Marginal Loop
Quality
Margin > 2 (Green) ................. Good Loop Quality
Figure 13 and Figure 14 illustrate the HDSL
Loopback and Self-Test Option screens. Loopbacks
and Self-Test may be evoked or terminated using
these screens. A status of current loopback
conditions is also provided.
The Troubleshooting Display, illustrated in
Figure 15
, graphically represents an HDSL circuit.
The unit reviews red, yellow, and blue alarm
conditions in the circuit to automatically predict
where a fault is located. Once a fault location is
suspected, the corresponding portion of the circuit
on the screen is highlighted and a message
describing the failure will appear.
The Set Time/Date/Circuit ID menu screen,
illustrated in
Figure 16 , provides additional
provisioning options. The time parameters are to be
entered as military time (for example, 3:15 p.m.
should be entered as “15:15:00”). The Circuit ID
can be entered as a 25-character string of
alphanumeric characters.