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Standard User backtoeleven
(newbie) Sat 31-Dec-11 12:09:28
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Acceptable Noise Margin?


[link to this post]
 
Hi,

I've been looking at quite a few of the posts on here around noise margins and I am concerned that my noise margin is far higher than any that I have seen posted previously.

I am having general speed issues at the moment so I am trying to fathom out where the problem lies as my ISP believes that the speed reaching my house is acceptable. However the speeds I am getting reported by the BT Speed Test are < 1Mbps.

I have been reviewing my router stats and comparing them with others that have been posted previously and the noise margin figures jumped out at me as being quite high.

I don't pretend to entirely understand the figures, I have done a little light bedtime reading around the subject area but it all goes way above my head.

Would someone be kind enough to give me their thoughts on the below stats?

--- System Information ---
Vendor: Linksys
ModelName: WAG120N
Firmware Version: A1.00.16 , 2010-08-06T14:08:04
GUI Version: A1.00.16_007
Boot Version: 1.0.37-5.4
Hardware Version: 0.01

--- DSL Information ---
DSL Driver Version: 3.4.4.10.0.1
DSL VPI/VCI: 0/38
DSL Status: Up
DSL Mode: G.dmt
DSL Channel: 0
DSL Upstream Rate: 448 kbps
DSL Downstream Rate: 7616 kbps

Down up
DSL Noise Margin: 270 dB 94 dB
DSL Attenuation: 155 dB 321 dB
DSL Transmit Power: -901 dBm -901 dBm

--- Wireless Information ---
Wireless Driver Version: "2.2.0.5"
Wireless Tools Version:
Wireless Status: Enabled
Wireless Wide Channel: 9
Wireless Standard Channel: 11- 2.462GHZ
Wireless SSID: Linksys

--- Dynamic Information ---
LAN Mac Address: 00:25:9C:85:2B:B3
WAN Mac Address: 00:25:9C:85:2B:B5
Wireless Mac Address: 00:25:9C:85:2B:B4

---

Any help would be gratefully received as I am starting to loose my rag with it all.
Standard User panda
(committed) Sat 31-Dec-11 12:34:42
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Re: Acceptable Noise Margin?


[re: backtoeleven] [link to this post]
 
In reply to a post by backtoeleven:
DSL Mode: G.dmt
You are on a 'up to 8Mb' service.

In reply to a post by backtoeleven:
DSL Upstream Rate: 448 kbps
DSL Downstream Rate: 7616 kbps
You are connected to the DSLAM at the highest rate possible for your service.

In reply to a post by backtoeleven:
Down up
DSL Noise Margin: 270 dB 94 dB
DSL Attenuation: 155 dB 321 dB
This looks like a decimal point is missing and should be:
Up Down
DSL Noise Margin: 27.0 dB 9.4 dB
DSL Attenuation: 15.5 dB 32.1 dB

Simplistically, there is nothing wrong with the physical ADSL connection. If your throughput is low, it would perhaps suggest that contention is present somewhere (a traffic jam on a connection within the network), possibly at either the local exchange or at the ISP.

Perform a BT Speed test (with a wired connection to your router - using wireless can be unreliable) and post the result (minus your telephone number) here.


Eats shoots and leaves.

Edited by panda (Sat 31-Dec-11 12:56:31)

Standard User XRaySpeX
(eat-sleep-adslguide) Sat 31-Dec-11 13:12:35
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Re: Acceptable Noise Margin?


[re: backtoeleven] [link to this post]
 
Nothing to worry about! You are on an "up to" 8 Meg ADSL1 connection and the NM is high accordingly.
In reply to a post by backtoeleven:
Down up
DSL Noise Margin: 270 dB 94 dB
DSL Attenuation: 155 dB 321 dB
Your router is reversing the Down/UP attenuations.

@panda: OP's router reports the dB measures in tenths.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC


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Standard User BatBoy
(legend) Sat 31-Dec-11 13:16:02
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Re: Acceptable Noise Margin?


[re: XRaySpeX] [link to this post]
 
In reply to a post by XRaySpeX:
@panda: OP's router reports the dB measures in tenths.
Centibels?



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Standard User panda
(committed) Sat 31-Dec-11 13:52:14
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Re: Acceptable Noise Margin?


[re: XRaySpeX] [link to this post]
 
In reply to a post by XRaySpeX:
@panda: OP's router reports the dB measures in tenths.
<pedant>If so, then the unit is incorrectly shown as dB. Either the unit should be cB or a decimal point is missing.</pedant>


Eats shoots and leaves.
Standard User epyon
(committed) Sat 31-Dec-11 16:03:56
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Re: Acceptable Noise Margin?


[re: panda] [link to this post]
 
7616 kbps - Interleave
8128 kbps - Fastpath

Sounds like congestion.

BE*Unlimited 19157/1399Kbps
Standard User XRaySpeX
(eat-sleep-adslguide) Sat 31-Dec-11 16:08:34
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Re: Acceptable Noise Margin?


[re: panda] [link to this post]
 
[buck pass]Take it up with the manufacturer[/buck pass]

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User MHC
(legend) Sat 31-Dec-11 16:54:57
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Re: Acceptable Noise Margin?


[re: XRaySpeX] [link to this post]
 
If there software is as bad as that on the UI, what about the rest of it. Can any of their figures be trusted? It obviously demonstrates that testing of the software and UI was not as rigorous as it should have been.





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M H C


taurus excreta cerebrum vincit
Standard User Zarjaz
(knowledge is power) Sat 31-Dec-11 17:08:35
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Re: Acceptable Noise Margin?


[re: backtoeleven] [link to this post]
 
Anything else in the router to show CRC/HEC/FEC errors ?

As said, the sync is just about as good as it gets on an up to 8 service. Name and shame the ISP, you *should* be seeing around 6 meg-ish through put speeds, if you are directly connected to the router, and no one else is using it.

Standard User BatBoy
(legend) Sat 31-Dec-11 17:11:19
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Re: Acceptable Noise Margin?


[re: Zarjaz] [link to this post]
 
His profile says "Orange"



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