Posted 09 June 2012 - 09:28 AM
Posted 10 June 2012 - 05:12 AM
Your switch guys might have a log of sync reconnects that may/not show a pattern.. this might help if you are dealing with a impulse noise issue (ie, always at dusk .. then go shoot it at dusk).
Possible house power issues ? Could try a small UPS at the modem.
Posted 10 June 2012 - 06:51 PM
What does this mean? And how can it help in finding the problem. I believe my meter has a function where I can count the errors in a sync test. I guess I could do a sync tests and various points and isolate the section that gives the errors.
Posted 10 June 2012 - 07:17 PM
CRC errors, while ideally should be 0, can be seen w/o causing customer issues. The error correction system takes care of it. Once you over run the CRC system, you can start getting FEC errors. Once you have enough FEC going on, you will begin to drop packets (freezing, blocking) and even loose sync. I generally just look at the FEC.. it should be 0 over some period of time.. (longer w/o fec errors is better, but impulse /etc can cause a few.. there's no strict rule with FEC b/c then you get into Interleave also..Interleave adds delay, but protects great against FEC loss due to impulse noise.. but again, only to a point.)
If you show 0 fec at the term, do look into customer wiring and local grounding.
Posted 11 June 2012 - 07:40 PM
Posted 21 July 2012 - 08:09 PM
Also tagged with one or more of these keywords: sync, dsl, repair, Exfo, impulse, tdr
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