The whole line speed issue...

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pm

78 posts

Master Geek

#18626 16-Jan-2008 22:23

It seems ISP's are bored/sick of hearing people complain about their poor line speeds...
Does anyone think I should stick with my current stats or continue trying to get my ISP/telecom to help more?

Connection: Broadband
Suburb: Bucklands Beach
Exchange: no idea
Router: Dlink ADSL2+ DSL502T (Generation II)
ISP: XNET
Router Status Page:

DOWNSTREAM:
SNR Margin: 5
Line Attenuation: 49
Data Rate: 4000

UPSTREAM:
SNR Margin: 24
Line Attenuation: 30
Data Rate: 160

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78 posts

Master Geek

#105296 16-Jan-2008 22:28

Oh and most speedtests (within Auckland) show rates at around 2800kbps.
(nzdsl, speedtest etc...)

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#105301 16-Jan-2008 23:00

pm:
Does anyone think I should stick with my current stats or continue trying to get my ISP/telecom to help more?

If you are with another Internet provider, you should be contacting that internet provider for support on your internet connection, not Telecom.

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Spyware

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#105302 16-Jan-2008 23:04

Downstream attenuation figure indicates that you are around 3.7 km from the exchange. If this is the case then the sync speed is probably typical. You need to find out were the exchange is to determine if you have a line or wiring fault!!

At that distance (3.7 km) the ADSL2+ upgrades will have no effect and the Dlink routers are speed limited anyway. See http://www.telecomwholesale.co.nz/adsl2plus and read the updates and presentations for info on the dlink modems and sync speeds after exchange upgrades.

See http://www.speedguide.net/ to analyse and optimise TCP receive window (should increase throughput on PC). Being on 128k up willl also limit download speed.

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Master Geek

#105303 16-Jan-2008 23:23

Just out of interest, how did you go about working out the distance from noise? Is there some kind of formular?

inquisitor

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#105313 17-Jan-2008 02:21

@pm
4 MBit/s at a attenuation of 49dB is presumably the best you can currently get through your line. The problem is the SNR, which is very low with 5dB, so if your provider raised your bandwidth the SNR would fall and that would result instability of your line.

@all
The ADSL bandwidth is dependant on line attenuation, which in turn collerates with line length. But the actual impact of line length on line attenuation is dependant on the wire diameter. The thicker the wires, the lower the attenuation per kilometer:

Ø 0,35 mm: 14,6 dB/km

Ø 0,4 mm: 12,5 dB/km

Ø 0,5 mm: 10,5 dB/km

Ø 0,6 mm: 8,4 dB/km

Ø 0,8 mm: 5,7 dB/km

Pm's 49db could result from a 3.4 km long 0.35-mm-wire up to a 8.6 km long 8-mm-wire.
So you can't definitely predict line length from attenuation only - you need to know the wire diameter. Beyond that distributors in the line network may additionally increase attenuation.

@spyware
Switching to ADSL2+ will have a significant effect to everyone's line, as attenuation and SNR usually decline by approximately 30% due to the wider frequency spectrum used by ADSL2+. So bandwidth and stability will improve even on long lines, however bandwidth improvements are relatively low on those.
Maybe my blog entry concerning ADSL2+ maybe of interest for you: http://www.geekzone.co.nz/inquisitor/3014

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pm

78 posts

Master Geek

#105339 17-Jan-2008 10:19

Yes I have been talking to xnet - they just said "full exchange" and hinted I deal with it.
My exchange is in Howick which is approximately 3 to 4km from my house (good guess Spyware).

I am not yet on ADSL2+, not for a while...

inquisitor: xnet can't increase the signal strength can they? I've heard them doing it too someone I know who had crappy SNR too. Or would increasing the SNR limit my bandwidth more?

inquisitor

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#105344 17-Jan-2008 10:31

Generally one can slightly increase transmission power of the DSLAM and so get a stronger signal to you, but that would increase crosstalk and so other customers are likely to suffer from your raise of power. I don't know if Xnet run their own DSLAMs and so can influence the power level at all or if they use Telecom's, but anyway it's not recommendable to proceed in this way, as the disadvantages outweigh the advantages.
Wait for ADSL2+ - that will bring you 1-2 MBit/s more.

Niel

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#105350 17-Jan-2008 10:50

The other improvement with ADSL2+ is that transmitting power is reduced to the minimum required to maintain good SNR. This does not help people close to the exchange, but it does help people furthat away because those people close to the exchange run at lower power, generating less crosstalk onto your line. But it only helps you if people close to the exchange have upgraded to ADSL2+ modems.

Your SNR is very low. I would suggest checking your ADSL line filters and make sure everything (other than your modem) is filtered. Start with unplugging everything except your modem. There can also be water inside your phone wires if an untrained person (read into this whatever you want to) worked on them (check the box where the line enters your home). The stripped wire ends are supposed to be covered with grease to prevent water getting in. If water got in you will see a lot of green stuff and fizzing of ionized water, it is very obvious.

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pm

78 posts

Master Geek

#105360 17-Jan-2008 12:06

Neil, the stats I quoted was without any telephones/faxes plugged in the phone line. I have just got the modem on a dynalink filter into the line - the dynalink filter gave the best sync rate out of the ones i tried. So I guess I won't make a deal of my speeds anymore...hopefully adsl2+ will give me the difference I want or will be happy with. Thanks for all the input guys. You certainly were more helpful than any tech support.

Niel

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#105430 17-Jan-2008 18:52

Note that you do not need the filter for the modem, only for the phone/Sky/fax/etc. What happens if you do the test without the filter? But looking at one of your previous posts I see you have had this before, sync at about 2Mbps and download at about 1.5Mbps. Have you tried a different modem?

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#105446 17-Jan-2008 20:29

how does one remove the speed limiter on their (my) dlink router?! that sucks?!

pm

78 posts

Master Geek

#105457 17-Jan-2008 21:56

Niel: Note that you do not need the filter for the modem, only for the phone/Sky/fax/etc. What happens if you do the test without the filter? But looking at one of your previous posts I see you have had this before, sync at about 2Mbps and download at about 1.5Mbps. Have you tried a different modem?

Yeah so my results in this thread don't have any filters on any of the lines (except for the adsl modem) - thus the modem is the ONLY device in the house using a tel. line. Now, you are correct with my previous sync rates of 2Mbps, what changed was me removing all telephones in the house but the modem and also changing from a DSL-302G to a DSL-502T.

Niel

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#106078 22-Jan-2008 10:41

pm:
Niel: Note that you do not need the filter for the modem, only for the phone/Sky/fax/etc. What happens if you do the test without the filter? But looking at one of your previous posts I see you have had this before, sync at about 2Mbps and download at about 1.5Mbps. Have you tried a different modem?

Yeah so my results in this thread don't have any filters on any of the lines (except for the adsl modem) - thus the modem is the ONLY device in the house using a tel. line. Now, you are correct with my previous sync rates of 2Mbps, what changed was me removing all telephones in the house but the modem and also changing from a DSL-302G to a DSL-502T.

Just want to make sure we understand each other. You say you have tested with no filters on any lines, that's how you should test it. But then you say "except for the adsl modem". Do you mean you have a filter on only your ADSL modem, or do you mean that the modem is the only thing connected to the phone line?

You can never have enough Volvos!

pm

78 posts

Master Geek

#106079 22-Jan-2008 10:45

Yeah sorry Neil, I meant the ADSL modem is connected to a filter.
Should I test it without the filter?

inquisitor

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Master Geek

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#106213 23-Jan-2008 00:09

@pm
Yes, test it without filter. That will work as long as nobody calls you on your landline. An incoming call will usually interrupt the ADSL connection.

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