adsl bandwidth now 50% what it was two months ago

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newbellies

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Topic # 96984 8-Feb-2012 17:16

Hi Folks,

I took modem stats when i first signed up with telecom broadband last year, and took stats again just the other day. I haven't changed anything with the wiring in my house in that time. The performance is now painful. Can any experts take a glance at the stats and tell me if they suggest anything? I'm wondering if it's because my neighbors may have gotten ADSL at home recently.

Also, i know they put in a new whisper cabinet a couple km away from my house a few months ago. Previously, i must have been connected to the one downtown. I expected that my speeds would be faster from that though, not slower.

I did try changing all the filters, telephone + ethernet cables, as well as modems - it didn't change anything.

Cheers!

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old: DSL Type: G.992.5 annex A pastedGraphic.pdf

now: DSL Type: G.992.5 annex A pastedGraphic_1.pdf

-----------

old: Bandwidth (Up/Down) [kbps/kbps]: 700 / 3.913
now: Bandwidth (Up/Down) [kbps/kbps]: 792 / 1.838

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old: Data Transferred (Sent/Received) [kB/kB]: 0,00 / 0,00

pastedGraphic_3.pdf

now: Data Transferred (Sent/Received) [kB/kB]: 0,00 / 0,00

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old: Output Power (Up/Down) [dBm]: 12,5 / 0,0

pastedGraphic_4.pdf

now: Output Power (Up/Down) [dBm]: 12,5 / 0,0
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old: Line Attenuation (Up/Down) [dB]: 34,5 / 57,5

pastedGraphic_5.pdf

now: Line Attenuation (Up/Down) [dB]: 30,5 / 53,5

* yes - i doubled checked that I didn't switch 'old/now' values around
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old: SN Margin (Up/Down) [dB]:10,5 / 12,5

pastedGraphic_6.pdf

now: SN Margin (Up/Down) [dB]:14,0 / 12,5

* yes - i doubled checked that I didn't switch 'old/now' values around
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old: Vendor ID (Local/Remote):TMMB / IKNS

pastedGraphic_7.pdf

now: Vendor ID (Local/Remote):TMMB / IKNS

johnr

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Reply # 578803 8-Feb-2012 17:18

http://www.geekzone.co.nz/sbiddle/Telecommunications

John

Ragnor

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Reply # 578818 8-Feb-2012 17:37

50dB ish downstream line attenuation should be good for 3-4Mbit and you're getting 1Mbit so definitely an issue there.

12dB noise margin and posted in Telecom section so probably not specifically LLU midspan injection issue (the first blog post on John's link).

They may not yet have completed the cabinet migration and your line might still be connected through the cabinet to the exchange though.

Otherwise could be anything like...
- modem incompatibility with new line cards
- internal wiring has developed a fault
- some kind of fault in the copper back to the cabinet/exchange

Ring the help desk and lodge a fault / go through the troubleshooting process.

Enter your address on www.chorus.co.nz/sat to find out what exchange area you are in and what cabinet you are connected to (if in a cabinet area).

newbellies

159 posts

Master Geek
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Reply # 578842 8-Feb-2012 18:00

Thanks, John (and Steve) for the link. Good read. But my attenuation has actually gotten better, not worse. (unless I'm reading that wrong). The upstream SN Margin did get worse though. So as Ragnor stated, I don't think that's the problem.

Ragnor, cheers for the info. The cabinet i'm closest to hasn't been upgraded yet, but a new cabinet not in that database did show up 2 kms away. I noticed that the workers laying fibre to my nearest cabinet stopped showing up last week. Not sure if they are ever going to finish that.

Cheers everyone for the info. I had already logged a ticket, but just trying to expedite things as it's definitely interfering with my work now.

I wish there was a shortcut to get to level 2 support. I can only roll my eyes so much when I'm asked, "So, how long does a webpage take for you to load?".

cbrpilot

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Spark NZ

Reply # 579177 9-Feb-2012 11:20

If the SN Margin is >12, restart your modem and you'll sync up faster.

The SN Margin would have been 12 when you last resync'd, and since then the line condition as improved meaning the SN Margin is now up to 14.

Sounds like your line condition fluctuates up and down quite a lot.

My views are my own, and may not necessarily represent those of my employer.

cyril7

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Reply # 579185 9-Feb-2012 11:31

Hi, the reduction in your line attenuation is minor considering overall its quite high, infact under new rules Chorus would probably not connect you for a new service. The change in attenuation and achieved noise margin are probably just the way the modem has dealt with a change in noise conditions, potentially from midspan injection issues if you are still on the exchange.

I would suggest you are still connected to the exchange, either because the nearby cabinet does not serve your address or you line has been forgotton in the change over. I have come across several instances where by error some lines were not moved to the cabinet when they should have been.

Cheers
Cyril

newbellies

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Reply # 579295 9-Feb-2012 14:17

cyril7:
I would suggest you are still connected to the exchange, either because the nearby cabinet does not serve your address or you line has been forgotton in the change over. I have come across several instances where by error some lines were not moved to the cabinet when they should have been.

Hi Cyril,

Bang on explanation. My broadband was hooked up to the exchange downtown, but then they put in a new cabinet couple km away, late last year. When that cabinet upgrade went live, I was left hooked up to the exchange downtown, and my bandwidth got cut in half.

In the meantime, because I logged an issue with them, they just finished switching me over to that cabinet (with only a few spots left in that cabinet, he said). I'm happy to now report the following:

Uptime:0 days, 0:18:21

DSL Type:G.992.5 annex A

Bandwidth (Up/Down) [kbps/kbps]:1.145 / 16.474

Data Transferred (Sent/Received) [kB/kB]:0,00 / 0,00

Output Power (Up/Down) [dBm]:12,5 / 0,0

Line Attenuation (Up/Down) [dB]:13,0 / 24,5

SN Margin (Up/Down) [dB]:13,5 / 12,0

Vendor ID (Local/Remote):TMMB / IKNS

Loss of Framing (Local/Remote):0 / 0

Loss of Signal (Local/Remote):0 / 0

Loss of Power (Local/Remote):0 / 0

Loss of Link (Remote):0

Error Seconds (Local/Remote):0 / 0

FEC Errors (Up/Down):3 / 420

CRC Errors (Up/Down):3 / 0

HEC Errors (Up/Down):0 / 0

They are supposedly still planning a cabinet upgrade within 400 m of here and I'm very much looking forward to that. It's a shame there isn't a scheme to move all users over when a cabinet is completed. Seems rather inefficient for everyone. I guess I'll just have to be quick to lodge a complaint once the Chorus vans stop showing up at that cabinet.

Cheers everyone for all the expert advice and explanations!

cyril7

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Reply # 579300 9-Feb-2012 14:28

Hi, glad its sorted, you have good results now.

Cheers
Cyril

l43a2

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Reply # 579316 9-Feb-2012 15:44

wow, what a massive jump in speed :P someone will be a happy camper now

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newbellies

159 posts

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Reply # 579334 9-Feb-2012 16:10

I feel like a dork for being happy about it, but yes I am!

Now, a touch of shame for being greedy for the next cabinet upgrade, which should unlock vdsl2. :-)