PairGain HiGain-ETSI RS UTU 712, Руководство пользователя

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Viewing Status 700-712-100-01, Revision 01
48 May 10, 1999 UTU-712 and ETU-762 List 1
Monitor HDSL Span 1 Screen
The Monitor HDSL Span 1 screen permits viewing of the 24-hour error counts for the HDSL span. 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 ( Figure 32 ), type to select the Monitor HDSL Span 1 screen ( Figure 35 ). The fields
displayed in the Monitor HDSL Span 1 screen are described in Table 24 .
Figure 35. Monitor HDSL Span 1 Screen
Table 24. Fields 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 the last 24-hour history clear.
High Margin (dB) Indicates the highest margin since startup or the last 24-hour history clear.
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 41 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.
HDSL Tip/Ring Reversal 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.
Clear 24 Hour History Not available from this screen on Nx64k serial data port units. Use clear history options in console
screen History menu. (For more information, see
“History Menu” on page 49 .)
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