Hi same thing I post on the AT&T Direct.
I was tell one person in the AT&T direct post about my problem with my internet connection that been disconnecting and connecting a lot just about every night after 9 pm CDT. There has been lot of these emergency network maintenance going on with my line and message ID NAD-3302. I told him that maybe it is due to an very old surge protection or i think it was a power strip that is near 20 or 25 years old. I said to him that my Motorola NVG510 rename too Arris NVG510 after a firm ware update that happen in June. Not sure if that is the cause of it.
Also told him I had a tech out here before in the spring this year. He gave me a new modem and also switch a cable out and replace it with a green cat5 e twisted pair cable.
He told me that network maintenance activities typically start at about midnight local time and usually only last till about 4am local time. That is assuming they are working on it at night. Not every night is a maintenance night for your area. It kind of depends on scheduling and such.
A bad or older power strip/surge suppressor could be a good and silent culprit. I would look for power loss events. Another thought to keep in mind, if the power strip is not supplying enough for the modem's power supply the modem can act erratically and drop connections even when it looks fully powered and accessible.
On June 30 I went to Best Buy and I bought myself a surge Protector that is 600 jolt and has built in EMI amd RFI noise filtering (which act like a choke coil or Ferrite Ring that you see on DVI cable for computers and USB and some power plug too like for printers and scanners) to filter out noise that is on the AC (Alternating current) which is great for me since I live in a apartment.
I wouldn't mind snapping Ferrite Ring on a dsl data cable I have and see what it will do and maybe make the SN Margin (dB) levels much more higher and filter out the noise where ever it coming from.
After I plug the new surge protector in That Saturday June 30 the same thing happen. Last week Friday It was pretty bad it was unstable SN Margin (dB) on the downstream very low numbers and even as low as -4.3 and -5 and the CRC Errors were jumping up right away at high rate. It disconnect and connect like 24 or more time between 9 pm and 11 pm. I even had numbers showing up in the Loss of Frame to and Loss of Signal on the downstream. I called att help desk they said it might be problem with the box somewhere outside on there end like on the building or by road
Even after 12 am it was doing the same for a little bit but internet was usable beside the phone that was blank and I try to restart the phone or reactive it but not luck until before 5:40 am this morning I click on Reset Device and that brought everything back to online and normal use with Downstream Sync Rate (kbps) ot 3600 and CRC Errors slowing going up every 3 to 10 mins like normal and SN noise levels are normal at 6.9 to 11.
On July 7 that evening/ night same time like 9 pm CDT and same thing with SN Margin (dB) starts at between 6.0 and 11 and goes went down to the low numbers to - 4.5 has the CRC error numbers went up at a higher rate than normal. Downstream Sync Rate (kbps) was between 3600 and 3400. Than it disconnection and than connection. That even on July 7 at 11:20 pm CDT The connection came back to normal stats and working good and stable connection for about 40 to 50 mins. The Downstream Sync Rate (kbps) is just under 2500. SNR margin downstream is between 16.9 and 17.9 and CRC Errors is still at 1. and the connection still was holding and stable for the rest of the night. I was just about too put a DSL Filter on the my att u-verse see if that will help.
Is there a way to do a deep line test scan on the connection. Too see what the cause it is..
I was thinking if 600 jolt protection is enough or go too 720 or 1000 jolts or higher and also is the built in EMI and RFI is causing problems. I was going to go to stables or office depot/ office max to check out what they have and buy a 1000 jolts or higher one.
Matt
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