Viewing Status
700-814-112-01, Revision 01
22
November 24, 1999
UTU-814 List 1B
Monitor HDSL Span Screens
lists the information displayed in the Monitor HDSL Span 1 screen
for Loop 1 (LTU-1/NTU-1) and Loop 2 (LTU-1/NTU-1).
Table 8.
Information Displayed in Monitor HDSL Span 1 Screen
Field
Description
Current Margin
(dB) (MAR)
Indicates the excess signal-to-noise ratio relative to a 10
-7
bit error
rate. The normal range of a typical margin is from 6 to 22 dB, with a
value of 6 dB corresponding to a predicted BER of 10
-10
.
Low Margin (dB)
Indicates the lowest margin since startup or since the last time the
24-hour history was cleared.
High Margin (dB)
Indicates the highest margin since startup or since the last time the
24-hour history was cleared.
Pulse Attenuation
(dB)
Indicates the attenuation of the 2B1Q pulse from the distant end. This
value is related to the cable pair’s loss at 292 KHz. The normal range
of pulse attenuation is from 1 to 32 dB.
Errored Seconds
(ES)
The number of one-second intervals in which at least one HDSL
CRC-6 error or loss of Sync Word (LOSW) was detected on the HDSL
span during the last 24 hours.
Unavailable
Seconds (UAS)
The number of seconds that the HDSL span was down during the last
24 hours.
Pair Exchange
Indicates whether the HDSL pairs carrying the traffic are correctly
connected or have been interchanged. The system automatically
compensates for an interchange of pairs.
Loop 1 Tip/Ring
Reversal
Indicates whether the two conductors of HDSL Loop 1 are correctly
connected or have been interchanged. The system automatically
compensates for an interchange of wire leads.
Loop 2 Tip/Ring
Reversal
Indicates whether the two conductors of HDSL Loop 2 are correctly
connected or have been interchanged by error. The system
automatically compensates for an interchange of wire leads.
Clear 24 Hour
History
Clears all 24-hour history counters (including DSX-1 values) and
displays the date and time the error counters were last cleared.
