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Predicting performance based upon signal quality varies with each loop. Generally, a noise margin of 0 or higher will support a bit error rate (BER) of better than
Table 3. LP1 and LP2 Guidellines
Margin | Color | Quality |
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Margin < 0 | Red | Poor Loop Quality |
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0 < Margin < 2 | Yellow | Marginal Loop Quality |
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Margin > 2 | Green | Good Loop Quality |
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Figure 15 and Figure 16 depict the HDSL Alarms and Test Screens. Current alarm conditions are displayed on the Alarms Screen, while a self test or loopbacks may be initiated or terminated using the Test Screen.
Shelf: 1 Slot: 5 |
| Total Access System |
| 04/07/01 09:16 | |||
Unacknowledged Alarms: |
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| MAJOR MINOR |
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Circuit ID: |
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| Alarms |
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| NO ALARM CONDITIONS |
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_____ |
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| _____ |
| _____ |
| _____ |
LTU | REG 1 | REG 2 | NTU | ||||
<===> | <===> | <===> | |||||
NET | CUST | ||||||
<===> | <===> | <===> | |||||
_____ | _____ | _____ | _____ |
‘?’ - System Help Screen
Figure 15. Alarms Screen
12 | Section |