Line 2 current picture:
The line 2 HCD depth or ‘drop’ has now increased to 2.16 dB. Still not enough to cause any major problems, but the error rate is now non-zero.
Summary of DSL links’ wellbeing and error counts
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* There are 4 modems in total. They are: #1, #2, #3 and #4
* The active, contactable modems are: #1, #2, #3 and #4
* The modems successfully queried are: #1, #2, #3 and #4
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*** There is some SERIOUS BADNESS ! ***
*** All is not well ! 😦 ***
*** ***
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* HCD:❗So-called ‘hollow curve disease’ (HCD) defect detected in the downstream SNR-vs-tones curve of link #2. Serious fault. 🔺
Link #2: Summary: curve midpoint test tone 59 is 2.15938 dB below chord 1: (tones 40-80); ❗
Link #2: Details: chord 1: [ tone 40: 35.0625 dB; chord midpoint test tone 59: 33.22188 dB; tone 80: 31.1875 dB ]; curve midpoint test tone 59: 31.0625 dB
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* ES (not so serious): The following links have a few CRC errors, at lower error rates, where the ES rate < 60 ES / hr (†):
Link #2: downstream: most recent period: ES per hr: 32.00, mean time between errors: 112.5 s, collection duration: 450 s, SNRM: 2.399 dB
Link #2: downstream: penultimate period: ES per hr: 12.00, mean time between errors: 300 s, collection duration: 900 s, SNRM: 2.399 dB
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