Line speed

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Anbo

103 posts

Master Geek

Topic # 59376 4-Apr-2010 09:58

Hi im just wondering about line attenuation and how it reflects on your line speed

Thses are the stats from my modem, I want to know if i am getting the appropriate speed

DSL Type:
G.992.5 annex A

Output Power (Up/Down) [dBm]:
12,0 / 19,0

Line Attenuation (Up/Down) [dB]:
12,0 / 23,0

SN Margin (Up/Down) [dB]:
12,0 / 11,5

Vendor ID (Local/Remote):
TMMB / BDCM

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):
0 / 0

CRC Errors (Up/Down):
0 / 33

HEC Errors (Up/Down):
79 / 31

Thanks in advance :)

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Reply # 314610 4-Apr-2010 10:07

What is your sync speed?

Anbo

103 posts

Master Geek

Reply # 314619 4-Apr-2010 10:25

Bandwidth (Up/Down) [kbps/kbps]:
773 / 10.823

But according to my research I should be getting higher.

Enter your Downstream attenuation (dB)

Cable Loss (dB/km) – Default 13.81

Attainable Rate (ADSL1) – kbit/s

8000

Attainable Rate (ADSL2) – kbit/s

19174

Distance to exchange (Meters)

1665

sbiddle

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Reply # 314633 4-Apr-2010 10:55

Do you have a master splitter or plug in filters?

It's very hard to get the maximum ADSL2+ performance with plug in filters, you really need a master splitter. This will also cure any issues because of wiring in your house causing reflections on the line.

If you've got plug in filters remove all of these and all phones and see what ytour results are.

Anbo

103 posts

Master Geek

Reply # 314634 4-Apr-2010 10:57

plug in filters, 2 filters for 2 phones

Will have a go at what you suggested now

Anbo

103 posts

Master Geek

Reply # 314637 4-Apr-2010 11:06

Ok well i did what you said, unplugged all filters and phones

Bandwidth (Up/Down) [kbps/kbps]:
1.041 / 9.828

if anything its syncing slower, but much faster upload

Anbo

103 posts

Master Geek

Reply # 314638 4-Apr-2010 11:14

I plugged 1 of the phones back in, it disconnected my internet, and reconnected back at

Bandwidth (Up/Down) [kbps/kbps]:
769 / 10.271

cyril7

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Reply # 314675 4-Apr-2010 14:25

When you get unstable and unpredictable results like that its fair to say that line stub effects are crimping your speeds, the only solution is to have a central filter installed.

Assuming you are on a Telecom wholesale connection then at 23dB (1.6km) you can only really expect somewhere between 10-14Mb/s, this is due to the fact that Telecom target a higher working S/N of 12dB rather than 6-7dB as used by other operators, while this reduces your speed it increases your line stability, the maximimum speed you are ever likely to see on a Telecom DSLAM is around 18Mb/s.

Cyril

matisyahu

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Reply # 314803 4-Apr-2010 21:18

Anbo:

I plugged 1 of the phones back in, it disconnected my internet, and reconnected back at

Bandwidth (Up/Down) [kbps/kbps]:
769 / 10.271

I would go and ask telecom to get the phone check; to only get 10.271kbps, which translates into 1.5KBs, there is deinately something wrong with your connection; I"m surprised you're able to surf the net with such a horribly slow connection.

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jeffreyh

42 posts

Geek

Reply # 314810 4-Apr-2010 21:38

I think your maths is wrong

jeffreyh

42 posts

Geek

Reply # 314811 4-Apr-2010 21:41

Sorry I should clarify I assume its 10271kbps and not 10

cyril7

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Reply # 314814 4-Apr-2010 21:55

Actually good point, I had read it in the fist place as 10Mb/s or there abouts, I assume that is the correct interpretation.

Cyril

matisyahu

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Reply # 314833 4-Apr-2010 23:07

jeffreyh: Sorry I should clarify I assume its 10271kbps and not 10

If that is the case then he is getting at least 1283 KB/s which is pretty damn good, close to 1 MBps.

I'm stuck on around 3,000 kbps, which translates into around 350KBps.

kbps = kilobits per second
KBps = kilobytes per second
MBps = megabyte per second

Anbo

103 posts

Master Geek

Reply # 314900 5-Apr-2010 10:38

With phones and splitters plugged in

Without phones or splitters plugged in

cyril7

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Reply # 314903 5-Apr-2010 10:42

Hi, so your sync speed is infact 10Mb/s, which as I say for a 1.6km line is not far from expected although a on the low side, without doing a full isolation test (which will replicate what you will get with a central) then I cannot comment further.

Typically from experience, with correct wiring I would expect 12-14Mb/s for a 1.5km line but there are things you cannot control like the street wiring, if you are on a high pair feeder with a full DSL packing (ie lots of other DSL users, hence higher background noise) then it can be slightly lower

Also I see you have interleaving off this will pull the speed back from what I would normally expect, so maybe your speed is fine.

Cyril

Anbo

103 posts

Master Geek

Reply # 314912 5-Apr-2010 11:10

I only got interleaving turned off about 4 days ago, the speeds pretty much the same.

Also im apparently connected directly into the Massey exchange so I don't know if the amount of users would affect my speed

Non interleaving:

From Telecom Wholesale

This address is near an exchange which has already been upgraded with faster broadband equipment (ADSL2+ technology).

Please note that factors such as chosen broadband plan, home or business wiring, and modem type can still affect the broadband performance at this address.

A pre-qualification check is required to determine what broadband services, if any, are available at this address.

Exchange Details
Exchange Area: Massey
Show cabinets within exchange
ADSL2+ Upgrade: Jan 2008

VDSL2 Upgrade: Not yet available

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