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Topic # 80732 3-Apr-2011 20:23 Send private message

Now this is an interesting issue I am having at home with my freshly install ADSL 2+ Exchange fed connection.

I'm about 2 1/2 Km's away from the exchange and just on the fringe VDSL converage as per the Telecom Wholesale maps.

Here are some of the weird stats.  With a new terrestrial cable to from the street pole to the point of presence on the house.  Then CAT5e as well as a Cat6 cable that I tested from there to a new 3 pair cable splitter.  This is about 8 meters long running in my roof.  I do have a rubbish Thompson 585 Rev 8 router, so will be trying a 2wire if I can borrow one from work tomorrow.

Link Information
Maximum Bandwidth (Up/Down) [kbps/kbps]:    1.033 / 7.208
Bandwidth (Up/Down) [kbps/kbps]:    1.033 / 6.389
Data Transferred (Sent/Received) [MB/MB]:    5,04 / 27,93
Output Power (Up/Down) [dBm]:    12,0 / 17,5
Line Attenuation (Up/Down) [dB]:    15,0 / 26,5
SN Margin (Up/Down) [dB]:    13,5 / 13,0
FEC Errors (Up/Down):    45.960 / 3.245
CRC Errors (Up/Down):    1.377 / 0
HEC Errors (Up/Down):    804 / 0

So... Here is where things get strange.

Removing the cat5/6 and replace it with a just patch frame wire, which is ~3 meters long.

Direct
Maximum Bandwidth (Up/Down) [kbps/kbps]:    1.001 / 9.180
Bandwidth (Up/Down) [kbps/kbps]:    1.001 / 8.493
Data Transferred (Sent/Received) [kB/kB]:    0,00 / 0,00
Output Power (Up/Down) [dBm]:    12,0 / 18,0
Line Attenuation (Up/Down) [dB]:    14,5 / 26,5
SN Margin (Up/Down) [dB]:    12,5 / 12,5
Vendor ID (Local/Remote):    TMMB /
Error Seconds (Local/Remote):    65.536 / 0
FEC Errors (Up/Down):    0 / 2.229
CRC Errors (Up/Down):    3 / 152
HEC Errors (Up/Down):    18 / NA

Then I thought, hey why don't I try it via the ~160meter spool of patch wire.  And this is the consistent rate I got.

Via spool:
Maximum Bandwidth (Up/Down) [kbps/kbps]:    1.025 / 10.704
Bandwidth (Up/Down) [kbps/kbps]:    1.025 / 9.557
Data Transferred (Sent/Received) [kB/kB]:    0,00 / 0,00
Output Power (Up/Down) [dBm]:    12,0 / 18,5
Line Attenuation (Up/Down) [dB]:    16,0 / 29,0
SN Margin (Up/Down) [dB]:    13,0 / 12,5
Vendor ID (Local/Remote):    TMMB / BDCM
Error Seconds (Local/Remote):    65.536 / 0
FEC Errors (Up/Down):    0 / 0
CRC Errors (Up/Down):    0 / 0
HEC Errors (Up/Down):    7 / 0   

I get a 1 1/2 megs higher higher sync rate which I never would have expected due to the larger attenuation as expected.  But I didn't get any FEC/CRC errors after running it for 20 mins or so.  Whereas with a shorter length I do get the errors.

The truly awesome Chorus / Downers guy is coming back this week, and he is somewhat stumped too.

Any clever suggestions would be appreciated. :)




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  Reply # 454901 3-Apr-2011 20:43 Send private message

Hi Peter, are you sure there is no stub effect, are they absolutely no taps off the cable once it hits the house.

Cyril



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  Reply # 454968 4-Apr-2011 08:06 Send private message

cyril7: Hi Peter, are you sure there is no stub effect, are they absolutely no taps off the cable once it hits the house.


Nope Stephen, I ran both the cat5 & 6 & 1 pair jumper cable myself.

Things were even more strange that the tech got 13 1/2 mb at the pole, 11mb at the point of presence at my house, and 6mb through the 8 meter piece of cat5.  This was using his ADSL2+ test tool not the router.

I think it's a dodgy pair myself, so he will be replacing that tomorrow.

But it worries me somewhat, being that I know that somethings wrong and I am pretty technical (albiet not as strong as you in the cabling / ADSL knowleadge :).. What about the regular punter?






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  Reply # 454971 4-Apr-2011 08:14 Send private message

Yep, sounds like a good plan.

One odd one I had the other day was were someone had connected both pairs of the two pair leadin together at the demarc, the leadin was around 80m long, so the 2nd pair created a rather long unterminated stub was causing all manner of issues with DSL.

Cyril



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  Reply # 454981 4-Apr-2011 08:35 Send private message

cyril7: Yep, sounds like a good plan.

One odd one I had the other day was were someone had connected both pairs of the two pair leadin together at the demarc, the leadin was around 80m long, so the 2nd pair created a rather long unterminated stub was causing all manner of issues with DSL.


My house is ~20 meters pole (13 1/2mb) to house demarc (11mb) which was replaced yesterday by the tech which took it from 7mb at the house demarc to 11mb (which still sounds weird for only an approx 20 meter run across the road and onto my house to drop that much which is why I am still pointing towards a dodgy pair).  Then from there it's approx 8 meters to my router sitting in a cupboard in the roof.

When I get ~10mb I'll be happy.. and IMHO that's what I think I should be at least getting.




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