Understanding SNR and Attenuation Rates

[sirkruger]

Link Information

Uptime: 0 days, 18:36:24

Modulation: G.992.1 annex A

Bandwidth (Up/Down) [kbps/kbps]: 128 / 384

Data Transferred (Sent/Received) [MB/MB]: 44,15 / 424,71

Output Power (Up/Down) [dBm]: -1,0 / 5,0

Line Attenuation (Up/Down) [dB]: 31,5 / 58,0

SN Margin (Up/Down) [dB]: 17,0 / 16,5

Vendor ID (Local/Remote): TMMB / TSTC

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 / 290

HEC Errors (Up/Down): 0 / 96



If anyone could help me out

drop me an email @ brentkruger@krunity.co.za

sorry abit of a noob in this

[calvincoetzee]

The lower the line attenuation the better, a low attenuation usually is because of a close distance to the exchange.
The higher the SNR the better, I think the higher the SNR the less noise on the line.

Your values are quite bad, mine is

Att: 12 / 7
SNR: 30 / 26

According to this site your max speed for adsl1 is 3Mbit, and 4Mbit for adsl2+ when the upgrades come in. As opposed to 8Mbit / 23Mbit on my line.

If you are close to your exchange then phone telkom to check out your line, if you plan to stay on a lower speed line then don't worry about it.
Hope this helps

[Bobb]

When visiting my father in law over the weekend i checked his line stats (Down) and he had an attenuation of 6.5 and an SNR of 41. He is basically less than 50m from the exchange.

Its a pity he can only afford 384k! Its a sin to waste a line like that.

[11masoodt]

hi guys,

i just checked my line stats and i dont understand something,

noise margin: 6.6 down, 9.0 up
line attenuation: 63.5 down, 31.5 up

and yet i'm only about 2.5km away from the exchange, i'm going to phone telkom and ask them what's going on, any1 help me as to which number to phone and what to ask.
thanks.

[nuyork]

hi guys,

i just checked my line stats and i dont understand something,

noise margin: 6.6 down, 9.0 up
line attenuation: 63.5 down, 31.5 up

and yet i'm only about 2.5km away from the exchange, i'm going to phone telkom and ask them what's going on, any1 help me as to which number to phone and what to ask.
thanks.

Could be bad copper wiring, as it is in my case in Lonehill. Which area are you in?

[Ludjer]

i would pay to move so close to a exchange lols

[Imminent]

nice topic thanks I bookmark it

[roadcat]

Port Elizabeth

--- DSL Information ---
DSL Driver Version: 3.4.4.10.0.1
DSL VPI/VCI: 8/35
DSL Status: Up
DSL Mode: G.dmt
DSL Channel: 0
DSL Upstream Rate: 512 kbps
DSL Downstream Rate: 4096 kbps - Speedtest shows 3.5Mb/0.43Mb

Down up
DSL Noise Margin: 270 dB 201 dB
DSL Attenuation: 85 dB 282 dB
DSL Transmit Power: -901 dBm -901 dBm

[cheese_za]

I think mine are ok :

Modem Status
Connection Status Connected
Us Rate (Kbps) 512
Ds Rate (Kbps) 4096
US Margin 13
DS Margin 11
Trained Modulation ADSL_G.dmt
LOS Errors 0
DS Line Attenuation 21
US Line Attenuation 10
Peak Cell Rate 1207
CRC Rx Fast 0
CRC Tx Fast 0
CRC Rx Interleaved 0
CRC Tx Interleaved 0
Path Mode Fastonly

DSL Statistics
Near End F4 Loop Back Count 0
Near End F5 Loop Back Count 0

[sbworrall]

Mode: G.DMT
Type: Fast
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 30.3 16.0
Attenuation (dB): 29.0 15.5
Output Power (dBm): -1.1 4.4
Attainable Rate (Kbps): 10944 872
Rate (Kbps): 384 128
K (number of bytes in DMT frame): 13 5
R (number of check bytes in RS code word): 0 0
S (RS code word size in DMT frame): 1 1
D (interleaver depth): 1 1
Delay (msec): 0 0

Yet Telkom states 384 is the max :/

[Mineer]

Mode: G.DMT
Type: Fast
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 30.3 16.0
Attenuation (dB): 29.0 15.5
Output Power (dBm): -1.1 4.4
Attainable Rate (Kbps): 10944 872
Rate (Kbps): 384 128
K (number of bytes in DMT frame): 13 5
R (number of check bytes in RS code word): 0 0
S (RS code word size in DMT frame): 1 1
D (interleaver depth): 1 1
Delay (msec): 0 0

Yet Telkom states 384 is the max :/

your exchange maybe maxed at 384

[ShaunSA]

Anyone care to interpret my lousy figures for a techno-idiot

--- DSL Information ---
DSL Driver Version: 3.4.4.10.0.1
DSL VPI/VCI: 8/35
DSL Status: Up
DSL Mode: G.dmt
DSL Channel: 0
DSL Upstream Rate: 128 kbps
DSL Downstream Rate: 384 kbps

Down up
DSL Noise Margin: 220 dB 282 dB
DSL Attenuation: 250 dB 475 dB
DSL Transmit Power: -901 dBm -901 dBm

[DrJohnZoidberg]

Anyone care to interpret my lousy figures for a techno-idiot

--- DSL Information ---
DSL Driver Version: 3.4.4.10.0.1
DSL VPI/VCI: 8/35
DSL Status: Up
DSL Mode: G.dmt
DSL Channel: 0
DSL Upstream Rate: 128 kbps
DSL Downstream Rate: 384 kbps

Down up
DSL Noise Margin: 220 dB 282 dB
DSL Attenuation: 250 dB 475 dB
DSL Transmit Power: -901 dBm -901 dBm

Damn those are some of the weirdest figures I've every seen. I think Telkom must have replaced some of your copper with nylon string.

[Flanders]

My line used to perform brilliantly at 4mbps but over the past few years performance dropped off to the point where I eventually had to settle for 2mbps. Recently, telkom sorted out the line to some degree and these are my current stats:

Upstream: 512 kbps
Downstream: 2048 kbps
SNR Margin (Upstream): 12.0 db
SNR Margin (Downstream): 21.5 db
Line Attenuation (Upstream): 21.5 db
Line Attenuation (Downstream): 40.5 db

I know they're busy with plans to improve things (there is currently a lot of foliage entangled on the line down the road and they need residents' permission to cut it) but I would like to phone the call center and get them to bump it back to 4mbit. Would this be doable or am I looking for trouble with my current line stats?

[roadcat]

Damn those are some of the weirdest figures I've every seen. I think Telkom must have replaced some of your copper with nylon string.

The funny thing I noticed is ShaunSA and I both appear to be using Linksys DSL routers, and both of us have weird stats. I suspect the stats on the Linksys are not completely accurate.