Checking Your DSL Line Quality

belal

Checking up your ADSL Line Quality via SNR Margin & Line Attenuation

SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. 6dB is the lowest dB manufactures specify for modem to be able to synch. In some instances interleaving* can help raise the noise margin to an acceptable level. The higher the number the better for this measurement.
> 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 no synch problems
> 20dB-28dB is excellent
> 29dB or above is outstanding
Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. Maximum signal loss recommendation is usually about 60dB. 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

http://blog.mx510.com/?p=703

Mine is: SNR 31
Line Attenuation 29 !
btw ogero's support told me that they are having some problems with their central....whereas the truth is that my modem was dying.. i just replaced it and everything is working like a charm.
advice: never ever try to call ogero or any other isp 's support.

Kareem

on my Linksys route I can access a hidden page with the following url http://192.168.1.1/setup.cgi?next_file=adsl_driver.htm

==========================

--- DSL Information ---
DSL Driver Version: AnnexA version - A2pB022g.d20e
DSL VPI/VCI: 0/35
DSL Status: ShowtimeRetrain Reason: 0
DSL Mode: G.DMT ( changed from ADSL2+ to g.dmt => lower attenuation and ~20% better latency)
DSL Channel: INTR
DSL Upstream Rate: 256 Kbps
DSL Downstream Rate: 1024 Kbps

Down up
DSL Noise Margin: 33.0 dB 31.0 dB
DSL Attenuation: 19.0 dB 13.0 dB
DSL Transmit Power: 14.6 dBm 7.1 dBm

...

---

I really doubt you have a 29db attenuation.

kareem_nasser

Check mine (IDM):
Line Attenuation (Up/Down) [dB]: 20,0 / 32,0
SN Margin (Up/Down) [dB]: 29,0 / 34,5
Modulation: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 509 / 1.021
but what does this mean: Concentrator Name: HAMRA

belal

Kareem

belal wrotehttp://img293.imageshack.us/img293/6776/24927552.jpg

dude 55db attenuation is almost outage ,or somehow vert poor, change the modulation and retry.

Kareem

kareem_nasser wroteCheck mine (IDM):
Line Attenuation (Up/Down) [dB]: 20,0 / 32,0
SN Margin (Up/Down) [dB]: 29,0 / 34,5
Modulation: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 509 / 1.021
but what does this mean: Concentrator Name: HAMRA

Probably the pppoe concentrator name.

gamer4life

this test is only for adsl users right? because i don't think i can do that with the mobi.

Kareem

Kareem wrote
kareem_nasser wroteCheck mine (IDM):
Line Attenuation (Up/Down) [dB]: 20,0 / 32,0
SN Margin (Up/Down) [dB]: 29,0 / 34,5
Modulation: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 509 / 1.021
but what does this mean: Concentrator Name: HAMRA
Probably the pppoe concentrator name.

Yes, good enough.

Kareem

gamer4life wrotethis test is only for adsl users right? because i don't think i can do that with the mobi.

Correct, only for ADSL modems;

plus mobi already sucks, no need for verification.

gamer4life

hold on partner i have adsl idm 512kb and the mobi, i prefered using the mobi more because it doesnt suck after 11pm at all.

kareem_nasser

IDM doesn't suck a lot... like others i mean. :(

Padre

Downstream Upstream
SNR Margin (dB): 34.1 36.9
Attenuation (dB): 6.0 0.6

belal

dude 55db attenuation is almost outage ,or somehow vert poor, change the modulation and retry.

Kareem, i am too far away from the DSLAM...like about 4km...
by some calculations, it seems that the highest speed i can ever get is 3923kbit/s(we won't reach that speed in Lebanon,anyways):P
http://fremnet.net/article/216/adsl-theoretical-speed-calculator

kareem_nasser

thats mine (with down Attenuation=32):
Attainable Rate (ADSL1) – kbit/s
7891
Attainable Rate (ADSL2) – kbit/s
14914
Distance to exchange (Meters)
2317

Aly

Line Attenuation (Up/Down) [dB]: 16,5 / 26,5
SN Margin (Up/Down) [dB]: 29,5 / 34,5

According to the test posted by Belal :

Attainable Rate (ADSL1) – kbit/s 8000
Attainable Rate (ADSL2) – kbit/s 21525
Distance to exchange (Meters) 559

Yay my phone line is future-proof for several centuries in Lebanon.

xterm

I can't find this information on my Thomson Gateway for the life of me. Where is it ?

belal

I can't find this information on my Thomson Gateway for the life of me. Where is it ?

Login...broadband connection -> dsl connection -> details(up right corner)

& Aly, use this: Line Attenuation (Up/Down) [dB]: 16,5 / 26,5 = 17359. :/

Yay my phone line is future-proof for several centuries in Lebanon.

:rolleyes:

Aly

belal wrote
I can't find this information on my Thomson Gateway for the life of me. Where is it ?
Login...broadband connection -> dsl connection -> details(up right corner)

& Aly, use this: Line Attenuation (Up/Down) [dB]: 16,5 / 26,5 = 17359. :/
Yay my phone line is future-proof for several centuries in Lebanon.
:rolleyes:

Ah yeh my bad :P then my line is futur-proof for a century or two :(

Padre

why am i the only one with such a low attenuation ? :/

Kareem

Padre wrotewhy am i the only one with such a low attenuation ? :/

inaccurate results ?