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[digitalnemesis]

VMG 8924:

MK3 + CAT6
Line Rate:      8.746 Mbps       48.638 Mbps
Actual Net Data Rate:      8.726 Mbps       48.563 Mbps


MK1 + CAT5e
Line Rate:      8.899 Mbps       51.013 Mbps
Actual Net Data Rate:      8.879 Mbps       50.937 Mbps

[skyeci]

don't forget at the time of connection some of the sync could be affected by your snrm levels changing etc. Many other factors need to be taken into consideration, if you have only done one test I don't think that would be enough evidence m'lud to prove one cable was better than the other..

I tried both cat5e and cat6 on my 8324 and neither were better than the supplied zyxel cable..

[digitalnemesis]

I have reason to believe it's the MK3 faceplate. Comparing QLN graphs the noise floor at the higher frequencies is raised.

[NewtronStar]

I found the Mk1 to have less attenuation than the Mk3 the reason being is there is an extra balum filter built into the Mk3 which works better for my noisy line than the Mk1

Try MK1 with Cat 6
Try MK1 with Cat 5e

Then Try MK3 with Cat 6
and then MK3 with Cat 5e

[gazaai]

Try the results of mk1 cat5e vs cat6 please

[digitalnemesis]

Try the results of mk1 cat5e vs cat6 please

MK1 + Cat6

Line Rate:      8.257 Mbps       50.222 Mbps
Actual Net Data Rate:      8.237 Mbps       50.145 Mbps

Upload sync has decreased over the past few months for some reason, possibly crosstalk.

Overall, Cat5 or Cat6 doesn't make much difference. MK1 gives highest sync on my line.

[Weaver]

Could I just ask where are the "higher frequencies"?  In the VDSL2 range? Would it make any difference to my low speed ADSL2 links? (Only 2.5 - 2.6 Mbps downstream sync rate, ~66 dB d/s attenuation.)

[digitalnemesis]

Could I just ask where are the "higher frequencies"?  In the VDSL2 range? Would it make any difference to my low speed ADSL2 links? (Only 2.5 - 2.6 Mbps downstream sync rate, ~66 dB d/s attenuation.)

VDSL2 17a profile up to 17MHz.

[burakkucat]

For G.992.3 (ADSL2), the maximum bandwidth is (256 × 4.3125 ÷ 1000) = 1.104 MHz

For G.993.2 (VDSL2, Profile 17a), the maximum bandwidth is (4096 × 4.3125 ÷ 1000) = 17.664 MHz

Classical telephony uses the range 300 Hz to 3.4 kHz (i.e. a bandwidth of 3.1 kHz) which is less than one xDSL subcarrier's width (4.3125 kHz).

The following image (from Wikipedia) shows a generalised view (which ignores some of the minor details), using G.993.2, Profile 12a as the VDSL2 example --

[Weaver]

Nice picture. Sorry, I didn't express myself very well at all. I meant to ask at what frequencies is digitalnemesis's QLN noise raised?

[digitalnemesis]

Nice picture. Sorry, I didn't express myself very well at all. I meant to ask at what frequencies is digitalnemesis's QLN noise raised?

Same Cat6 RJ45 cable

MK1
Max:    Upstream rate = 8344 Kbps, Downstream rate = 50271 Kbps
Bearer: 0, Upstream rate = 8237 Kbps, Downstream rate = 50145 Kbps



MK3
Max:    Upstream rate = 8136 Kbps, Downstream rate = 48342 Kbps
Bearer: 0, Upstream rate = 8039 Kbps, Downstream rate = 48342 Kbps

[Weaver]

Wow. Thank you very much, for your generous post! 

[digitalnemesis]

Wow. Thank you very much, for your generous post! 

It's fine, I'm just curious as to why the MK3 does this on my line and why I get those tone gaps. It seems the extra windings in the MK3 raises the noise floor.

[Weaver]

So if my addled brain and poor eyesight have read it properly, the difference in noise levels starts to kick in above bin ~2900. Sound about right?

[digitalnemesis]

So if my addled brain and poor eyesight have read it properly, the difference in noise levels starts to kick in above bin ~2900. Sound about right?

That seems about right. I didn't notice any less errors on the MK3 so I use the MK1 for the highest sync.