Table 14. Pair Reversal Key Definitions; Table 15. Hdsl Loop Signal Quality; Table 16. Adtran Noise Margin Guidelines - ADTRAN HDSL DDM+ HTU-C Installation And Maintenance Practice

An indication of Pair Reversal (if present) appears at the bottom of the first key column. Definitions
for this key are provided in
DSX-1 signals is located in the center of the screen near the bottom.
Indicator
FRAME
CODE
LBO
NIU
BPV
ES
SES
UAS
Alarms
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
0
1-3
4
Performance predictions are based on signal quality variances with each loop. Generally, a
noise margin of 0 or higher will support a bit error rate of better the 10
the following guidelines
(margin) messages
1=XX
Margin
Margin = 0
0 ≤ Margin ≤ 3
4 ≤ Margin ≤ 20
61247003L6-5A
Table 14. Status and configuration information for the DS1 and

Table 14. Pair Reversal Key Definitions

Definition
T1 framing format selected
T1 line coded selected
Line build-out selected (for DSX-1), Customer
signal of 0 or –15 dB (for DS1)
Network interface unit enabled
Bipolar violations detected (DSX-1 and DS1)
Errored seconds (DSX-1 and DS1)
Severely errored seconds (DSX-1 and DS1)
Unavailable seconds (DSX-1 and DS1)
Lists current alarm condition status

Table 15. HDSL Loop Signal Quality

Signal Quality
Poor
Marginal
Excellent
(Table 16) that correspond to the Loop 1 and Loop 2 signal quality
and on the FCD of the DDM+ HTU-C.
2=XX

Table 16. ADTRAN Noise Margin Guidelines

LP1/LP2 LED
Red
Yellow
Green
Table
Noise Margin
≤ 0 dB (≈10
–7 BER)
above 10 –7 BER in dB
≥ 4 dB above 10
BER
–7
-7 . ADTRAN has defined
Loop Quality
Poor Loop Quality
Marginal Loop Quality
Good Loop Quality
Menu Descriptions
15.
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