topic Re: Excellent Line Attenuation, poor SNR in Archived Posts

Excellent Line Attenuation, poor SNR

Johnny74 — Tue, 10 Aug 2021 18:03:11 GMT

Hi Forum,

After a few weeks of fairly regular, short, drop outs and many tests by the Broadband team at EE, but finding nothing, I changed the modem/router out as it was fairly old and getting red hot.

New modem/router installed and all working fine, but I notice that whilst

the line Attenuation is good (Under 18dB) the SNR is fairly bad

Upstream Downstream

Current Rate (kbps)	19000	50713
Max Rate (kbps)	23356	51103
SNR Margin (dB)	8.6	6.2
Line Attenuation (dB)	18.1	9.1
Errors (pkts)	0	0

We had Openreach out to replace the incoming cable and wallbox a few months back, so that shouldn't' be the issue.

Any ideas?

Re: Excellent Line Attenuation, poor SNR

XRaySpeX — Tue, 10 Aug 2021 18:12:29 GMT

There's nowt wrong with a NM of 6dB. It is the usual target. Your Current Rate is almost hitting your Max Rate.

Re: Excellent Line Attenuation, poor SNR

Johnny74 — Tue, 10 Aug 2021 18:15:15 GMT

Thanks for the reply. Seems I might be overthinking it then.

Hopefully changing the modem/router will stop these interrupts then.

Cheers.

Re: Excellent Line Attenuation, poor SNR

XRaySpeX — Tue, 10 Aug 2021 18:25:31 GMT

You must be! Attenuation & NM are not related. Attenuation is a measure of distance. NM is a measure of insurance or a leeway against noise.