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[NewtronStar]

I would like to see your experiments converted to dslstats or HG612_Modem_stats graphs as thats the only reference we have as the JDSU 3000 is kind of expensive 

[burakkucat]

Assuming Bald_Eagle1 is agreeable and willing to assist, my intention is to provide a montage of the snapshot data and the full, raw harvested data as a ZIP format image of the ASCII text file. 

[Bald_Eagle1]

Of course I'm agreeable.

Whenever you are ready, my furry fiend (not a typo) 

[burakkucat]

I have been giving some further thought as to how I could connect together the three pairs on both spools of cable. Once again, I will define the abbreviations I shall use:

NE -- near end (the outer end of the cable on the spool).
FE -- far end (the inner end of the cable on the spool).
S1 -- spool one.
S2 -- spool two.
B -- blue pair (blue/white stripe & white/blue stripe).
O -- orange pair (orange/white stripe & white/orange stripe).
G -- green pair (green/white stripe & white/green stripe).
LJU2/3A -- Line jack unit with IDCs (secondary).

The third method of connection:

LJU2/3A to NE,S1,B
FE,S1,B to NE,S2,B
FE,S2,B to NE,S1,O
FE,S1,O to NE,S2,O
FE,S2,O to NE,S1,G
FE,S1,G to NE,S2,G
FE,S2,G to LJU2/3A

Of the three methods, I prefer the third because the "direction of travel" of the signal through the spools of cable is always in the same direction.

[burakkucat]

I present the results obtained when performing an experiment with the Planet VC-230N in the Konrado configuration. This just defines the absolute maximum limit to which the equipment can be "pushed".

The local loop length was 1.5 metres. The VC-230N was configured in fastpath mode, the target SNRM was set at 0 dB and no rate capping was applied.

Attached below is an image of the VC-230N configuration screen, the portrait montage (with thanks to Bald_Eagle1 for plotting the data) and the raw data harvested from the HG612.

[burakkucat]

I present the results obtained when performing the Ronski series of experiments with the Planet VC-230N in (what I term) the basic configuration. The aim of these experiments is to see if there is any degree of "self interference" when using all three pairs of each spool, serially.

Experiment 1

The local loop length was 211 metres, which consisted of the blue pair of spool 1 (103 metres) and the blue pair of spool 2 (108 metres) in series.

The VC-230N was configured in interleaved mode, the target SNRM was set at 6 dB and no rate capping was applied.

Attached below is an image of the VC-230N configuration screen, the portrait montage and the raw data harvested from the HG612.

[burakkucat]

Experiment 2

The local loop length was 206 metres, which consisted of the blue pair of spool 1 (103 metres) and the orange pair of spool 1 (103 metres) in series.

The VC-230N was configured in interleaved mode, the target SNRM was set at 6 dB and no rate capping was applied.

Attached below is an image of the VC-230N configuration screen, the portrait montage and the raw data harvested from the HG612.

[burakkucat]

Experiment 3

The local loop length was 216 metres, which consisted of the blue pair of spool 2 (108 metres) and the orange pair of spool 2 (108 metres) in series.

The VC-230N was configured in interleaved mode, the target SNRM was set at 6 dB and no rate capping was applied.

Attached below is an image of the VC-230N configuration screen, the portrait montage and the raw data harvested from the HG612.

[burakkucat]

The Ronski series of experiments clearly show that there is a significant degree of coupling at the higher frequencies and, thus, self-interference between the pairs. 

As of yet, I have not performed any further tests.

Unless someone can convince me otherwise, I intend to use the third method of connection of the pairs (see my post of September 11, 2014, 23:39:57, above) when testing with the Planet VC-230N in (what I term) the Openreach mimic configuration. 

[burakkucat]

I performed the experiments, collected the data, passed that same data to the expert Eagle, received graphical plots in return and promptly forgot to post the results to this thread!   

To recap I have presented results, above, obtained by performing an experiment using the Konrado configuration ("pushing" the circuit as far as is possible) and three tests using the Basic Configuration, suggested by Ronski, which shows that there is significant self-interfering cross-talk (for which a new abbreviation, SIXT, has just been created) when the same signal is sent through two (or more pairs) within the same cable binder.

This last sequence of seven experiments were performed using an Openreach Mimic Configuration, as shown in the first image below.

In each of the seven experiments both the Planet VC-230N and the Huawei HG612 were connected by identical leads with RJ11 & 431A plugs at each end. When I mention the length of the local loop, it does not include the lengths of those two leads, only the the length of the circuit between the two 431A plugs.

The local loop was gradually built up from a length of 0 metres to a length of 633 metres, using connections as detailed in my my post of September 11, 2014, 23:39:57, above.


Experiment 1.

Local loop length: 0 metres.

Attached is the raw data (as a ZIP format file) and the portrait montage.

[burakkucat]

Experiment 2.

Local loop length: 103 metres.

[burakkucat]

Experiment 3.

Local loop length: 211 metres.

[burakkucat]

Experiment 4.

Local loop length: 314 metres.

[burakkucat]

Experiment 5.

Local loop length: 422 metres.

[burakkucat]

Experiment 6.

Local loop length: 525 metres.