Since my mum had been complaining on the instability of my house’s Streamyx connection, I had decided to spend some time to troubleshoot it. For quite some time already, my Internet had been a disaster. For a while it would connect and run super fast. After that it would suddenly slow to a crawl and websites refused to load. The cycle will continue in a gap of about 5 minutes each. I had always suspected the recent everyday-raining weather to contribute a lot to this scenario but can I do something about it? That’s what I am going to find out. I focus on downstream (download) only because upstream (upload) connection seems unaffected.
My house’s Streamyx is interconnected as follows: Main telephone socket -> Microfilter -> Internet wiring -> Lightning arrestor -> Modem.
Initial Stage (Before trials):
The initial SNR Margin and attenuation are: 18db and 52db.

When the SNR Margin dropped to 11db after a while, the Internet connection would hang due to the amount of noise in the line would be too much and almost every frames/packets downstream would contain errors. Notice the amount of frame errors below! Upstream packets/frames would seem unaffected. The SNR Margin would climb back to 18db after 5minutes and Internet resumes and then dropped again.

First trial:
So the first thing I did was to connect the modem direct to the main telephone socket to confirm the possible causes of signal drop due to the intermediate connections. The result from this shows the SNR Margin climbed to 22db and attenuation dropped to 48db. I still notice there is a signal drop every 5 minutes to around 18-19db. At 18-19db, the signal appears to be strong enough and did not cause any Internet problems. Some slight frame errors still occur though.


Second trial:
The next step would be to eliminate the lightning arrestor as the possible cause of signal drop. I connected the modem to the lightning arrestor which in turn connects to the main socket. The result was the same as the first trial. So far so good. SNR margin: 22db and attenuation 48db.
Third trial:
I then connect as follows: Main telephone socket -> internal wiring -> lightning arrestor -> modem. The result was the same as the initial stage. SNR Margin at 18db and attenuation 52db. SNR would drop to 12db and Internet would stop functioning!
Final trial:
One last thing to try: Main telephone socket -> microfilter -> external telephone cable -> lightning arrestor -> modem. The result was: SNR Margin 19db and attenuation 48db. The SNR still would drop till a level where by Internet stopped functioning at 12db.

Conclusion:
My Internet connection from the First and Second Trial was fast and very very stable. So I guess I shall connect as how I did in the Second Trial for the time being. My internal wiring and microfilter is causing signal drops for my ADSL link, which needs to be further investigated. For a good and stable ADSL connection, SNR Margin should be as high as possible and attenuation should be as low as possible. I am still not able to pin point the exact causes for the signal level drop. But from experience, it is possible to be caused by TM equipments at the RDSLAM or DSLAM side.
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