justbits
More fiber than ATT can handle
Premium
join:2003-01-08
Chicago, IL
 ·AT&T Midwest
2 edits | reply to justbits
Re: Any 5100b technician page DMT/SNR data experts?
Let me add some history. The 3.0/512 Pro profile as shown above worked for all of April 2005. Starting May 1, 2005, the line would lose sync twice a weekday. During the problem period, the line mysteriously grows 2000-4000 feet in length according to the DSLAM.
Recently, SBC has tried to solve the problem shown above by switching me to a replacement pair of wires, that exhibits the same problem I described in the earlier part of this thread.
The latest resolution was to switch me from the 1.5Mb/384 profile to 768/384. So far this weekend, the line hasn't lost sync at the lower speed, but it does exhibit what I believe to be amazingly similar graphs when compared to the same kind of graphs I was seeing at 3.0/512 profile speeds. Notice how the nice stair-step DMT graph goes into a jagged lower-quality signal during the problem?
Here's the line as it looks just before the problem.
Here's the line as it looks during the problem.
Here's the line quality after I power cycled the modem a short while later. (It stays looking basically like this from 1pm til 6am the next morning.)
Does anyone have any expert knowledge on the SNR/DMT values/graphs I'm getting from my 5100b?
By the way, I have QuickTime movies of the problem drawn graphically for the last 16 days.
Thanks,
--justbits |
