SNR and Att Decay over time

[Chrisn3108]

Hello All

I am new here and hoping to get some resolution on this sticky subject of reduced SNR and slow speeds.

I have looked up on google, ways to improve SNR and seems I cant do much without getting the ISP involved.

However last night while surfing and monitoring the line att and noise margin, I recieved an incoming call and noticed immediately that the att reduced from about 59-60 down to 54-55 and margin increased from 6-9 to above 15 db.

This morning when I logged on I noticed the same bad numbers above (att 59-60 db and SNR 6-9
db). I then called my home number via cell and noticed the very same improvement. Seems like decay over some time.

Using Netgear DGN2200 on ADSL 1Mb uncapped. Incoming line splits to phone and modem. No filter on line to modem.

Can anyone explain this and how to resolve permanently.

Thanks
Chrisn

 

[DrJohnZoidberg]

Are you having issues with speed, disconnects or packet loss? If not then does it really matter what your line stats are?

 

[Zewp]

I experience the exact same thing. My SNR is usually between 6-7, my attenuation is usually over 45. Whenever I use the telephone, the SNR and attenuation go back to acceptable levels. I called Telkom this morning and suddenly SNR was at 23 and attenuation at 35.

This is frustrating, as we've been struggling with speed and stability for more than a month now. I literally just came back from buying a new router, and that didn't fix the problem. 2mb line is only syncing at 1600 even with the new router.

 

[Chrisn3108]

Are you having issues with speed, disconnects or packet loss? If not then does it really matter what your line stats are?

Yes, I am having all of the above when SNR drifts down to 6 db and below. My thinking is that the line some how gets purged when I use the phone.

 

[grim]

When a phone rings there's an increase of voltage on the line.

Do you have POTS filters connected to all you devices on the line?

 

[Chrisn3108]

No filters or conncetors used, should I be using one???

 

[grim]

No filters or conncetors used, should I be using one???

If you have a telephone on the line you should be using a filter on it.

You should've received one with your ADSL router.

 

[Zewp]

That depends on the router. Not all of them give filters. The Trendnet router I bought today didn't come with one.

Most proper routers should, though.

 

[Chrisn3108]

If you have a telephone on the line you should be using a filter on it.

You should've received one with your ADSL router.

The main incoming line splits 3 way, one upstairs and two downstairs. I initally had the phone and router upstairs with pots filter for both. I then moved the router down (shorter cable) and using a filter. Still getting low SNR. When the phone rings the SNR shoots up by about 20 numbers (with or without filter) and the router temporarily de-syncs. Could the filter on the router be faulty. I am not using a filter on the phone upstairs.

 

[Sl8er]

How many phones have you got connected to your line AND are there any cordless phones?

Here's why:

I had a similar thing occur to me.

*Line stats "ok-ish".
*Phone rings, someone answers
*Line stats improve

I was stumped. I applied some Google-Fu and came across an Australian forum. I started reading this guy's post about him bitching about his "slow" speeds (5mbps ).
One forum member suggested he disconnect EVERYTHING -phones, fax machines, everything.

I decided to give it a go. I have 2 phones in the house, one cordless and one "permanent". I disconnected everything and suddenly I was cruising along in pure epicness. I plugged the phones in one by one. The minute the cordless phone was plugged in, everything died! As it turns out, the cordless phone was messing with the line. I have not plugged it in since and have not experienced anything but epicness since.
That's my story. If you have a cordless phone it may be the cause of the problems. Give it a go and let us know what happened. Aside from that, I really have nothing else to offer, sorry.
Good luck!

 

[Chrisn3108]

I have installed a filter on the line to the router and seem to be getting acceptable steady SNR's, between 12 and 20. However still get the boost when the phone rings.