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[Weaver]

[burakkucat]

Ah, no, please don't bother with that. I just wanted to compare the style of plotting. As you will recall, when I was last using an ADSL2 based service my bit loading v sub-carrier plots did not show any pilot tone(s). (I'm not saying that they were not present . . .)

Puzzled. 

[Weaver]

[burakkucat]

[Weaver]

Another question: is the pilot tone always a single tone only? ie x-width == 1. Never x-width >= 2 ? I step sideways to get away from a suspected pilot tone.

[burakkucat]

Let x be the sub-carrier index (or tone) and y be the bit-loading at x . . .

for (x > 32; x < 120; x++) {
        if (y < 3)
                continue;

        process data;
}


Remember that a pilot tone is a defined frequency, not a 4.3125 kHz block of frequencies. The latter is what we are looking at on the X-axis.

[Weaver]

[burakkucat]

I really don't know . . . I regard ADSL2(+) and VDSL2 as identical except for the band plans, which define the number of sub-carriers and the split between US & DS.

I know that Fritz!Box devices will very clearly put an indicator for the pilot tone in the plots they show. I have never seen any evidence for a pilot tone when plotting data for my ADSL2 (deceased) and VDSL2 (current) circuits.

[Weaver]

[burakkucat]

[burakkucat]

[Weaver]

[Weaver]

[Weaver]

[Weaver]