Table 12. Hdsl Loop Signal Quality; Table 13. Adtran Noise Margin Guidelines - ADTRAN T200 HTU-R Installation And Maintenance Manual

A measure of signal quality for each HDSL loop appears on the bottom right and left of the
screen. Guidelines for interpreting the measure indicators are given in
Measure
Predicting performance based upon signal quality varies with each loop. Generally, a noise
margin of 0 or higher supports a bit error rate of 10
correspond to the operation of the T200 HTU-R, SP/60 mA front panel LEDs labeled
are illustrated in
DSL2
Margin = 0
0 < Margin < 4
Margin > 4
61247026L1-5A

Table 12. HDSL Loop Signal Quality

Signal Quality
0
1-3 Marginal
≥4
Excellent
Table 13.

Table 13. ADTRAN Noise Margin Guidelines

Margin LP1/LP2 LED
Red
Yellow
Green
Noise Margin
Poor
≤ 0 dB (≈10
above 10
≥4 dB above 10
-7 or better. ADTRAN defined guidelines that
Loop Quality
Poor Loop Quality
Marginal Loop Quality
Good Loop Quality
Menu Descriptions
Table 12.
–7 BER)
–7 BER in dB
–7 BER
DSL1
and
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