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Author Topic: HG612 Firmware [August 2014] -- A "Test Run"  (Read 16813 times)

burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #30 on: October 18, 2014, 11:51:13 PM »

Experiment 7.

Local loop length: 633 metres.
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Chrysalis

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #31 on: October 19, 2014, 06:03:01 AM »

interesting that my attenuation and pre crosstalk stats were similar to your 300m tests.

can you test adding QLN to emulate crosstalk?
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #32 on: October 19, 2014, 03:52:03 PM »

Sorry Chrys but I'm not sure I understand exactly what it is that you are asking.  :-\

My test with a (103 + 108 + 103) metres (314 metres) local loop was the first to show SIXT as the circuit pathway consisted of --
  • LJU2/3A to near end of blue pair, spool 1
  • far end of blue pair, spool 1 to near end of blue pair, spool 2
  • far end of blue pair, spool 2 to near end of orange pair, spool 1
  • far end of orange pair, spool 1 to LJU2/3A
The SIXT was occurring between the blue and orange pair within spool 1.

If I had three spools (of nominally 100 metres) I could then mimic the attenuation of your circuit. I would then require a second pair of devices (CO & CPE) connected via a second pair through that (nominally) 300 metres local loop cable which would then provide the required cross-talk. (NEXT and/or FEXT.) Such testing would really require usage of a DSLAM/MSAN -- something that Asbokid could do with his Huawei SmartAX MA5616
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #33 on: October 19, 2014, 04:16:55 PM »

There is one further experiment that I could perform with the equipment that I have available.  :)

That is to set up a (103 + 108) metres (211 metres) local loop and connect a Rheostat No 1A in series with one leg of the loop. The rheostat has a range of 0 - 9999 Ohms (10000 Ohms range) and by gradually increasing the resistance, mimic the appearance of a resistive fault within the circuit.

To harvest results at every one Ohm would be an impossible task (10000 experiments); likewise harvesting results at every 10 Ohms (1000 experiments) or 100 Ohms (100 experiments).

However harvesting results at every 1000 Ohms (10 experiments) would be a feasible task . . . Perhaps I should perform a few preliminary experiments to see how the circuit behaves. Hmm . . . Use inserted resistances of 0, 1, 10, 100, 1000, 9999 Ohms to get a "feel" for the circuit's response and then plan a more extensive experimental sequence based on the preliminary results.

Input and suggestions from interested kitizens will be appreciated.
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les-70

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #34 on: October 19, 2014, 04:49:43 PM »

  From a quick glance I think each of the Hlogs other than from the test with the shortest length cable shows significant reflections from one end of the cable to the other.  The frequency difference between the dips in Hlog looks to correspond to a wavelength close to each of the respective cable lengths.  This may be a mismatch between the devices or bad joint.  This probably makes the results a bit pessimistic.  I think Asbo used baluns avoid something like this.
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #35 on: November 13, 2014, 12:40:12 AM »

The set of six experiments as detailed in my reply #33, above, has now been performed.

Experiment 1.

Inserted resistance: 0 Ohms
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #36 on: November 13, 2014, 12:42:33 AM »

Experiment 2.

Inserted resistance: 1 Ohms
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #37 on: November 13, 2014, 12:44:02 AM »

Experiment 3.

Inserted resistance: 10 Ohms
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #38 on: November 13, 2014, 12:45:48 AM »

Experiment 4.

Inserted resistance: 100 Ohms
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #39 on: November 13, 2014, 12:46:58 AM »

Experiment 5.

Inserted resistance: 1000 Ohms
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #40 on: November 13, 2014, 12:48:42 AM »

Experiment 6.

Inserted resistance: 9999 Ohms (We could really consider this as 10000 Ohms, for simplicity.)
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #41 on: November 13, 2014, 01:00:42 AM »

Once again I would like to acknowledge the assistance of Bald_Eagle1 in producing the relevant graphs from the raw data harvests. If anyone noticed a sudden heavy flurry of electrons flowing between The Cattery & The Eagle's Nest and then in the return direction, the graphs displayed above are the end result.  :)

I cannot think of any other experiments that I could perform with the facilities that I have available. So I hope all of the above results will provide the data for other Kitizens to analyse and then share.  ;)
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tickmike

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #42 on: November 16, 2014, 02:17:20 PM »

Interesting  :).
Can you do any diagrams of your tests ? when you are not Cat napping   :blush:
If I can find it, I have /had a HR crimp joint of my line from some years ago, I can not remember how much wires are coming out of it, if there is enough to get my meter on it I will measure what the resistance is  ;).
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burakkucat

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Re: HG612 Firmware [August 2014] -- A "Test Run"
« Reply #43 on: November 16, 2014, 04:54:56 PM »

Michael -- The circuit for the last six experiments was quite straightforward.

It consisted of the two spools of CW1308 cable (103 metres and 108 metres), an LJU2/3A at each end of the 211 metres length, one wire of the selected pair from each cable firmly connected via a "chocolate block" screw connector and the other wire of the selected pair attached to the terminals of the Rheostat No. 1A.

The Planet VC-230N (acting as a one port DSLAM) was connected to one of the LJU2/3As via a standard RJ11 plug to 431A plug lead and the Huawei 612 (the CPE) was connected to the other LJU2/3A via a similar RJ11 plug to 431A plug lead.

Thank you for offering to attempt to measure the resistance across that defective crimped joint. If measurement is possible, it would then give us an idea of the typical sort of resistance that such a failed joint could add to a circuit.  :)
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