Whirlpool

Neon Glow writes...

stats which I pulled off my modem?

DOWN UP
Connection Speed 1536 kbps 128 kbps
Line Attenuation 19 db 6 db
Noise Margin 25 db 6 db

Can someone explain to me how you do this? I have a Billion 7400.

i believe you need the billion SNMP viewer...

www.billion.com.au/downl...iewer_100_57.zip
www.billion.com.au/downl...rver%20Setup.doc

Thanks ShAdOw SnIpA and bahamot.

Now i just got to figure out if the numbers are good.
Anyone want to give a quick Analysis?

DOWN UP

Speed 1.54 Mbps 256 kbps
Line Attenuation 2.5 db 3 db
Noise Margin 26 db 31.5 db

They are very good figures (low signal loss and little noise on the line).

Also, you seem to be very close to the exchange (maybe only around 180metres).

"Way to go !" as the kids say.

Manatoba writes...

They are very good figures (low signal loss and little noise on the line).


Thanks, are those figures backed up by the tcpIQ figures?


Number of tests 1
Download speed 1193.05 KBits/sec 149.13 KBytes/sec
Upload speed 205.19 KBits/sec 25.65 KBytes/sec
DNS Speed 420.00 mSec
Latency 28.00 mSec

I've seen better DL speeds reported here.

Manatoba writes...

Also, you seem to be very close to the exchange (maybe only around 180metres).

By road it's approx. 500m

How do you work this out?
T.

sorry to bump this up.

can someone explain what is considered good and bad for noise margin and line attenuation.

also how can you tell how far you are away from the exchange just by looking at these figures.

Anyone?

noki388 writes...

can someone explain what is considered good and bad for noise margin and line attenuation.

What is considered good or bad is largely determined by how far from the exchange you are.

In general, lower attenuation figures are good and higher Signal to Noise Margins are good.

how can you tell how far you are away from the exchange

The equation I have seen suggests that downstream attenuation divided by 13.81 will roughly equal KM from the exchange. For example; if you had a downstream attenuation of 40dB...

40dB / 13.81 = 2.896 KM

If you are using the Billion SNMP Viewer to obtain the figures, you should be aware that the downstream/upstream figures should be switched.

Noise Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. The higher the number the better for this measurement. In some instances interleaving can help raise the noise margin to an acceptable level.

6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with little or no synch problems* (but see note below)
20dB-28dB is excellent
29dB or above is outstanding

* Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not show up in the figures.

Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. The lower the dB the better for this measurement.

20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues

DSL Rate ***/tx/rx/Rate
The actual service data rate that your ISP has provisioned.

Attainable Line Rate
This is the maximum rate at which your modem can connect to the DSLAM if there was no service provisioning limiting the bandwidth. The higher the number the better.

Occupancy
Occupancy is the percentage of line capacity used. Each DSL line is capable of a certain maximum speed or "capacity" dependant on line distance and other varying factors. The occupancy is an expression of your current sync rate setting over your maximum capacity. There are occupancy rates for both upload and download. The lower the figure, the better. Because of error correction and other factors in the DSL protocols, a margin is required so that a connection can be maintained under varying line conditions. If the occupancy approaches 100%, any interference can cause the ADSL sync to be lost. A useful measurement to monitor when sync problems occur. [AFAIK the billion SNMP utility does not give a direct measurement of occupancy :-( ]

(with due acknowledgment of the other sources/forums that this info was gleaned from)

_Raz_ writes...

If you are using the Billion SNMP Viewer to obtain the figures, you should be aware that the downstream/upstream figures should be switched.

?? more info please

are you saying all displayed values are swaped? upstream<>downstream
in the ADSL line pages? or just Atn and SRN values?

cheers

the mutt

themutt writes...

?? more info please

Just the Attenuation and SNR Margin figures (but I'm not 100% certain about the SNR Margin).

The problem is not with the SNMP Viewer, but with the SNMP agent within the router.

These are the figures from my Belkin. So I have an issue with Upstream Noise Margin right? Why are there different figures for upstream and downstream?

I appear to have a problem with Upstream noise margin...is this to do with filters etc?

Noise Margin Upstream 8 dB Downstream 18 dB
Attenuation Upstream 30 dB Downstream 17 dB

Up Stream 822 (Kbps.)
Down Stream 12283 (Kbps.)