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Intermittent DSL Internet Connection. Need to Narrow down patterns

I have a client who has had an intermittent Telus ADSL Internet Connection since they opened up shop about 4.5 years ago. Over the years, we have changed the modem, Talked to Telus many times, Telus has changed ports etc.etc.

Three factors that have hindered a proper resolution of this are:

A. The office only had 3 computers. Now it only has 2.

B. The users are light internet users and have not given timely feedback as to outages.

C. The problems are intermittent. Sometimes 30-60 minutes can go by without any significant packet loss and then suddenly the connection is down for a minute or two.

Recently, we have made changes to the remote server that they connect to at head office and it has become apparent that the internet is still acting up.

The shop is an oilfield fabrication shop and the phone lines come into the back of the shop and are somehow routed to the front where the modem and router are.

I believe that it is not a neighborhood issue as there are much bigger companies around who would not put up with that kind of inconsistency. I have checked with another IT company that services that area and they have verified that the Telus connections for their clients are consistent.

In order to get a final resolution to this, I need to be able to find a way to accurately map out when the connection is dropping so that I can verify if it is the same time every day or the same time for the appropriate day of the week or if there is simply no pattern to it.

I can also change ISP's but the cost will go up about 3X.

Can anyone think of a way to accurately map timeouts throughout the course of a day/week without someone having to sit there and watch it?

I have ruled out the router by bypassing it and testing with a laptop directly.

We have swapped out the modem, but it was several years ago.
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You might also monitor their DSL modem too while you're at it just to make sure it's not a hardware issue at the site.
One more thought: You might ask Telus to put a debug-level monitor on your client's connection.  If the DSL line drops out due to a sync problem or something, they should easily be able to pick up on it via logging at their end.  Maybe they can do the same thing on the client's DSL modem (enable some kind of detailed logging).
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Networking
Networking

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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