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700-701-100-02
Monitor HDSL Span 1 Screen
The HDSL Span 1 screen
1 interface. A span is defined as the link between two HDSL units (that is, from an LTU to an NTU) which, in this
case, is comprised of a single loop (that is, one twisted-copper pair). The values under the LTU-1 column represent
HDSL Span 1 as measured by the LTU. The values under the NTU-1 column represent HDSL Span 1 as measured
by the NTU.
At the Monitor menu
displayed in the Monitor HDSL Span 1 screen are described in
Field
Current Margin (dB) (MAR)
Low Margin (dB)
High Margin (dB)
Pulse Attenuation (dB)
Errored Seconds (ES)
Unavailable Seconds (UAS)
HDSL Tip/Ring Reversal
Clear 24-Hour History
UTU-701 and ETU-751 List 1
(Figure
33) displays the circuit performance and 24-hour error counts at the HDSL span
(Figure
30), type
1
to select the Monitor HDSL Span 1 screen
Figure 33. Monitor HDSL Span 1 Screen
Table 26. Fields in Monitor HDSL Span 1 Screen
Description
Indicates the excess signal-to-noise ratio relative to a 10
a typical margin is from 6 to 22 dB, with a value of 6 dB corresponding to a predicted BER of 10
Indicates the lowest margin since startup or the last 24-hour history clear.
Indicates the highest margin since startup or the last 24-hour history clear.
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 41 dB.
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.
The number of seconds that the HDSL span was down during the last 24 hours.
Indicates whether the two conductors of the HDSL span are correctly connected or have been
interchanged. The system automatically compensates for an interchange of wire leads.
The date and time that the 24-hour histories were last cleared are displayed here. Enable this
function by pressing
L
action must be confirmed by pressing
Table
26.
or
ENTER
to clear all 24-hour history counters (including HDSL). This
Y
.
August 9, 2002
Viewing Status
(Figure
33). The fields
-7
bit error rate. The normal range of
-10
.
51
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