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150-388-105-05, Revision 05 Provisioning
HLU-388 List 5 March 25, 2000 41
Press to display margin values for the circuit ( Figure 23 ).
Figure 23. Troubleshooting with Margin Values
Press to display the insertion loss values for the circuit ( Figure 24 ).
Figure 24. Troubleshooting with Insertion Loss Values
M
TIME: 00:30:21 TROUBLESHOOTING with MARGIN VALUES
DATE: 02/18/00 CIRCUIT ID#:
___ ___ ___ ___ ___ ___
| |17 15| |15 16| |16 16| |16 16| |16 19| |
>>>>| |=====| |=====| |=====| |=====| |=====| |>>>>
<<<<| |=====| |=====| |=====| |=====| |=====| |<<<<
|___|17 17|___|16 17|___|17 16|___|17 17|___|17 19|___|
NETWORK HLU HDU1 HDU2 HDU3 HDU4 HRU CUSTOMER
MARGIN
Margin is the signal-to-noise ratio at the HDSL transceiver.
An M symbol on the graph indicates a margin lower than 4 dB.
Low margin is a result of high noise level and/or low HDSL signal level.
Some causes of low margin:
- Long loop
- External interference
- Excessive cross-talk
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I
TIME: 00:30:11 TROUBLESHOOTING with INSERTION LOSS VALUES
DATE: 02/18/00 CIRCUIT ID#:
___ ___ ___ ___ ___ ___
| |35 36| |36 36| |36 36| |36 36| |36 35| |
>>>>| |=====| |=====| |=====| |=====| |=====| |>>>>
<<<<| |=====| |=====| |=====| |=====| |=====| |<<<<
|___|36 36|___|36 36|___|36 36|___|36 36|___|36 35|___|
NETWORK HLU HDU1 HDU2 HDU3 HDU4 HRU CUSTOMER
INSERTION LOSS
Insertion loss is the attenuation of the HDSL signal at 196 kHz.
Pulse attenuation is directly related to insertion loss.
An I symbol on the graph indicates an insertion loss of 38 dB or higher.
High insertion loss is the result of a low received HDSL signal.
Some causes of high insertion loss:
- Long loop
- Bridged taps
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