Understanding SNR and Attenuation Rates

Something changed..

Code: 
ADSL Configuration
This page shows the setting of the ADSL Router.
Adsl Line Status	SHOWTIME.L0
Adsl Mode	G992.5
Up Stream	947 kbps
Down Stream	12479 kbps
Attenuation Down Stream	28
Attenuation Up Stream	17
SNR Margin Down Stream	10.6
SNR Margin Up Stream	13.1
Vendor ID	RETK
Firmware Version	4926dc02
CRC Errors	1342
Up Stream BER	32e-7
Down Stream BER	15e-7
Up Output Power	12
Down Output Power	20
Down Stream ES	397
Up Stream ES	57
Down Stream SES	196
Up Stream SES	33
Down Stream UAS	371
Up Stream UAS	0
 
BigBear said:
Something changed..

Code: 
ADSL Configuration
This page shows the setting of the ADSL Router.
Adsl Line Status	SHOWTIME.L0
Adsl Mode	G992.5
Up Stream	947 kbps
Down Stream	12479 kbps
Attenuation Down Stream	28
Attenuation Up Stream	17
SNR Margin Down Stream	10.6
SNR Margin Up Stream	13.1
Vendor ID	RETK
Firmware Version	4926dc02
CRC Errors	1342
Up Stream BER	32e-7
Down Stream BER	15e-7
Up Output Power	12
Down Output Power	20
Down Stream ES	397
Up Stream ES	57
Down Stream SES	196
Up Stream SES	33
Down Stream UAS	371
Up Stream UAS	0
Click to expand...

and we down again..

Code: 
ADSL Configuration
This page shows the setting of the ADSL Router.
Adsl Line Status	SHOWTIME.L0
Adsl Mode	G992.5
Up Stream	767 kbps
Down Stream	7167 kbps
Attenuation Down Stream	28
Attenuation Up Stream	17
SNR Margin Down Stream	15.3
SNR Margin Up Stream	18.3
Vendor ID	RETK
Firmware Version	4926dc02
CRC Errors	1533
Up Stream BER	17e-7
Down Stream BER	5e-7
Up Output Power	12
Down Output Power	20
Down Stream ES	1455
Up Stream ES	103
Down Stream SES	455
Up Stream SES	37
Down Stream UAS	982
Up Stream UAS	0

Now VOX is getting blamed by Telkom Tech :whistle:
 
Really ?? WTH ??? :confused::(

Code: 
Adsl Line Status	SHOWTIME.L0
Adsl Mode	G992.3
Up Stream	254 kbps
Down Stream	2071 kbps
Attenuation Down Stream	33
Attenuation Up Stream	22
SNR Margin Down Stream	31.8
SNR Margin Up Stream	6.1
Vendor ID	RETK
Firmware Version	4926dc02
CRC Errors	0
Up Stream BER	0e-7
Down Stream BER	0e-7
Up Output Power	12
Down Output Power	19.5
Down Stream ES	1664
Up Stream ES	0
Down Stream SES	546
Up Stream SES	0
Down Stream UAS	1263
Up Stream UAS	0
 
I currently have a 4 MB line and want to go up to a 8 MB line, according to Telkom's website my exchange can do 20 MB lines.
What does these stats tell you, will I be able to get full 8 MB line speeds?
BTW I'm using a TP-link Archer D7 which is a pretty decent modem router.

SNR Margin (dB)
19.5 6.6

Line Attenuation (dB)
18 32
 
bigboy529 said:
I currently have a 4 MB line and want to go up to a 8 MB line, according to Telkom's website my exchange can do 20 MB lines.
What does these stats tell you, will I be able to get full 8 MB line speeds?
BTW I'm using a TP-link Archer D7 which is a pretty decent modem router.

SNR Margin (dB)
19.5 6.6

Line Attenuation (dB)
18 32
Click to expand...

SNR 19.5 (DOWN) / 6.6 (UP)
ATT 18 (DOWN) / 32 (UP)

??

My Stats I am on 10 mbps and Telkom shows 20 mbps ADSL and VDSL available but not according to Agents and TelikomZA.

Code: 
Adsl Line Status	SHOWTIME.L0
Adsl Mode	G992.5
Up Stream	947 kbps
Down Stream	10239 kbps
Attenuation Down Stream	27
Attenuation Up Stream	17
SNR Margin Down Stream	12.1
SNR Margin Up Stream	13.2
 
Dade Murphy said:
My downstream attenuation is at 42dB but according to www.broadbandstats.co.za the exchange is only 2km away. Is there a problem with my line?
Click to expand...

You do know that the line could follow a completely different path?
The shortest route to the exchange (following roads) would place me at just over 2km, but Telkom decided it would be better to roll out in a different direction and make a "sweep" towards me, so it ends up being 3km instead.
 
Code: 
[B]Zertop's LineTool Results
Date/Time: Thu Apr 07 16:36:47 CAT 2016[/B]
[I][B]
Basic Report:[/B][/I]

Your packet loss was 0%.
Your average ping was 24ms.
Your maximum ping was 25ms.

Looking at your average ping, your line seems to be running perfectly.
It seems that your maximum ping is also good. If there are any issues, they most probably lie with your ISP


Johnatan56 said:
You do know that the line could follow a completely different path?
The shortest route to the exchange (following roads) would place me at just over 2km, but Telkom decided it would be better to roll out in a different direction and make a "sweep" towards me, so it ends up being 3km instead.
Click to expand...

I suppose there is no fault then. Although I don't understand why my line keeps dropping on 6mb with an attenuation of 42dB.
 
Dade Murphy said:
Code: 
[B]Zertop's LineTool Results
Date/Time: Thu Apr 07 16:36:47 CAT 2016[/B]
[I][B]
Basic Report:[/B][/I]

Your packet loss was 0%.
Your average ping was 24ms.
Your maximum ping was 25ms.

Looking at your average ping, your line seems to be running perfectly.
It seems that your maximum ping is also good. If there are any issues, they most probably lie with your ISP




I suppose there is no fault then. Although I don't understand why my line keeps dropping on 6mb with an attenuation of 42dB.
Click to expand...

What's the rest of the line stats?
I have 10Mbps and am slightly further from the exchange than you (according to attentuation):
Code: 
Actual rate (up)	1020 kbps
Actual rate (down)	10236 kbps
Data transfered (sent)	0 kB
Data transfered (received)	0 kB
Output power (up)	12 dBm
Output power (downstream)	17.5 dBm
Line attenuation (up)	22.8 dBm
Line attenuation (downstream)	42.6 dB
Noise margin (up)	6.5 dB
Noise margin (downstream)	8 dB
 
Last edited:
Code: 
ADSL link status: up

Opmode: ITU G.992.5(ADSL2PLUS)

near-end interleaved channel bit rate: 5120 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 0 kbps
far-end fast channel bit rate: 380 kbps

near-end FEC error fast: 0
near-end FEC error interleaved: 28990
near-end CRC error fast: 0
near-end CRC error interleaved: 16
near-end HEC error fast: 0
near-end HEC error interleaved: 242
far-end FEC error fast: 0
far-end FEC error interleaved: 0
far-end CRC error fast: 1
far-end CRC error interleaved: 0
far-end HEC error fast: 0
far-end HEC error interleaved: 0
ADSL uptime :2 days,  3:23, 45 secs
ADSL activetime :0 min, 13 secs

Downstream:
relative capacity occupation: 100% 
noise margin downstream: 11.1 dB
output power upstream: 12.8 dbm
attenuation downstream: 42.0 dB

Upstream:
relative capacity occupation: 100% 
noise margin upstream: 30.2 dB
output power downstream: 0.0 dbm
attenuation upstream: 22.3 dB
 
Dade Murphy said:
Code: 
ADSL link status: up

Opmode: ITU G.992.5(ADSL2PLUS)

near-end interleaved channel bit rate: 5120 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 0 kbps
far-end fast channel bit rate: 380 kbps

near-end FEC error fast: 0
near-end FEC error interleaved: 28990
near-end CRC error fast: 0
near-end CRC error interleaved: 16
near-end HEC error fast: 0
near-end HEC error interleaved: 242
far-end FEC error fast: 0
far-end FEC error interleaved: 0
far-end CRC error fast: 1
far-end CRC error interleaved: 0
far-end HEC error fast: 0
far-end HEC error interleaved: 0
ADSL uptime :2 days,  3:23, 45 secs
ADSL activetime :0 min, 13 secs

Downstream:
relative capacity occupation: 100% 
noise margin downstream: 11.1 dB
output power upstream: 12.8 dbm
attenuation downstream: 42.0 dB

Upstream:
relative capacity occupation: 100% 
noise margin upstream: 30.2 dB
output power downstream: 0.0 dbm
attenuation upstream: 22.3 dB
Click to expand...

You shouldn't be having problems. You are on interleaved though.
 
Hi guys,

On a 20mbps VDSL line from VOX. In CPT. Billion 8800NXL router. My router stats show the following:

Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.4 6.2
Attenuation (dB) 0.0 0.0
Output Power (dBm) 14.5 2.1
Attainable Rate (Kbps) 21436 1249

Getting around 16.8mbps down and 1mbps up. Although ping to JHB sitting at 58ms.

Any improvements I can make? The router gives and option to change SNR, but it doesn't work anymore for some reason? When I got it I could change it to 3, etc. Now nothing happens when I change it.

Anyone know where I can find the latest firmware?
 
Code: 
ADSL link status: up

Opmode: ITU G.992.5(ADSL2PLUS)

near-end interleaved channel bit rate: 6398 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 0 kbps
far-end fast channel bit rate: 764 kbps

Downstream:
relative capacity occupation: 100% 
noise margin downstream: 8.4 dB
output power upstream: 12.6 dbm
[COLOR="#FF0000"]attenuation downstream: 39.7 dB[/COLOR]

Upstream:
relative capacity occupation: 100% 
noise margin upstream: 15.3 dB
output power downstream: 0.0 dbm
attenuation upstream: 20.3 dB

near end itu identification: 26005443544e0000
far end itu identification: b5004946544e71b9
attain upstream: 1136
attain downstream: 9320

ADSL activetime second: 13
ADSL total ativetime second: 13
ATURANSIRev: 0
ATUCANSIRev: 0
ATURANSIStd: 0
ATUCANSIStd: 0
Interleave Depth: 64

atur chan interleave delay: 8
atur chan prev tx rate: 764 kbps
atur chan curr tx rate: 764 kbps
atur chan crc block len: 12999
Adsl Standard: ADSL2 PLUS
Adsl Type: ANNEX_A

Code: 
ADSL link status: up

Opmode: ITU G.992.1(G.DMT)

near-end interleaved channel bit rate: 6400 kbps
near-end fast channel bit rate: 0 kbps
far-end interleaved channel bit rate: 768 kbps
far-end fast channel bit rate: 0 kbps

Downstream:
relative capacity occupation: 100% 
noise margin downstream: 7.5 dB
output power upstream: 12.5 dbm
[COLOR="#FF0000"]attenuation downstream: 33.5 dB[/COLOR]

Upstream:
relative capacity occupation: 81% 
noise margin upstream: 13.0 dB
output power downstream: 19.5 dbm
attenuation upstream: 20.5 dB

near end itu identification: 26005443544e0000
far end itu identification: b5004946544e71b9
attain upstream: 1144
attain downstream: 7200

ADSL activetime second: 12
ADSL total ativetime second: 76
ATURANSIRev: 0
ATUCANSIRev: 1
ATURANSIStd: 0
ATUCANSIStd: 0
Interleave Depth: 32

atur chan interleave delay: 0
atur chan prev tx rate: 768 kbps
atur chan curr tx rate: 768 kbps
atur chan crc block len: 13599
Adsl Standard: G.DMT
Adsl Type: ANNEX_A

Why does G.DMT mode reduce my downstream attenuation? Which one is a true reflection of my attenuation?
 
Last edited:
Dade Murphy said:
Code: 
ADSL link status: up
<snip>

Why does G.DMT mode reduce my downstream attenuation? Which one is a true reflection of my attenuation?[/QUOTE]

Because G.DMT uses half the frequency spectrum compared to ADSL2+. Attenuation increases as frequency increases over copper (because it essentially a big coil...coils are low-pass filters)

ADSL1 = 1Mhz
ADSL2+ = 2Mhz



Which one is a true reflection ? Both.
Click to expand...
 
How would you analyze the below stats from my D-Link router ???

I have been having problems with my line slowing down, when I phone Telkom to a port re-create it lasts for only a few hours and then slows down to 1/10th of my 2Mbps line.

Can anyone shed light on who I should be looking at for this problem Telkom or my ISP ???

Thanks in Advance


Screen Shot 2016-05-11 at 3.43.29 PM.jpgScreen Shot 2016-05-11 at 3.43.29 PM.jpg
 
threegee said:
How would you analyze the below stats from my D-Link router ???

I have been having problems with my line slowing down, when I phone Telkom to a port re-create it lasts for only a few hours and then slows down to 1/10th of my 2Mbps line.

Can anyone shed light on who I should be looking at for this problem Telkom or my ISP ???

Thanks in Advance


View attachment 361170View attachment 361170
Click to expand...
Doesn't look like your line should be having problems. Could you post a ping and a tracert to myBroadband ?
Could you also sign up for a free 1GB account from e.g. Afrihost, axxess or Crystalweb and see if the problem cotinues? Post a tracert from the free account as well. Sadly can't link it as I am on my phone.
 
10 mbps Telkom DSL Line - MWEB/technicolor TG589vn v3 ADSL Router

Download Speed 12 mbps :D
Upload speed 512 kbps :mad:

ASSIA :whistle::confused:

Code: 
xdsl info expand=enabled
Physical Layer Statistics:        

  Modem state:                  		 up
  Up time (Days hh:mm:ss):      		 0 days, 19:05:57
  xDSL Standard:                		 ITU-T G.992.5 Annex A (ADSL2+ over POTS)
  xDSL Annex:                   		 Annex A
  Channel Mode:                       		 Interleaved

  Number of reset:              		 0

  Chipset Vendor info (G.994.1):   		 Local 		Remote
    Country code:                  		 B500  		B500
    ID:                            		 BDCM  		BDCM
    Specific:                      		 0000  		A41B

  System Vendor info (showtime): 		 Local 		Remote
    Country code:                		 0F00  		0000
    ID:                          		 TMMB  		----
    Specific:                    		 3C61  		0000

  [B]Bearers generic info          	 	 DS         	US       
    Payload rate [kbps]: 	 		 12476    	508   
    Attenuation [dB]:     			 25.0           14.7           
    Margins [dB]:         			 6.7            24.4   [/B]        
    Output power [dBm]:   			 18.9           12.0           

    Number of bearers:          		 1
    Bearer 0                    		 DS         	US       
      INP [DMT symbols]:    			 4.74           3.74           
      Delay [ms]:           			 7.71           7.67           
      Depth []:           			 448            0.00
      R:                  			 12        	0       

G.997.1 Statistics (Current):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 1       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A

G.997.1 Statistics (last 15 minutes):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 0       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A

G.997.1 Statistics (last 24 hours):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 1       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A
 
BigBear said:
10 mbps Telkom DSL Line - MWEB/technicolor TG589vn v3 ADSL Router

Download Speed 12 mbps :D
Upload speed 512 kbps :mad:

ASSIA :whistle::confused:

Code: 
xdsl info expand=enabled
Physical Layer Statistics:        

  Modem state:                  		 up
  Up time (Days hh:mm:ss):      		 0 days, 19:05:57
  xDSL Standard:                		 ITU-T G.992.5 Annex A (ADSL2+ over POTS)
  xDSL Annex:                   		 Annex A
  Channel Mode:                       		 Interleaved

  Number of reset:              		 0

  Chipset Vendor info (G.994.1):   		 Local 		Remote
    Country code:                  		 B500  		B500
    ID:                            		 BDCM  		BDCM
    Specific:                      		 0000  		A41B

  System Vendor info (showtime): 		 Local 		Remote
    Country code:                		 0F00  		0000
    ID:                          		 TMMB  		----
    Specific:                    		 3C61  		0000

  [B]Bearers generic info          	 	 DS         	US       
    Payload rate [kbps]: 	 		 12476    	508   
    Attenuation [dB]:     			 25.0           14.7           
    Margins [dB]:         			 6.7            24.4   [/B]        
    Output power [dBm]:   			 18.9           12.0           

    Number of bearers:          		 1
    Bearer 0                    		 DS         	US       
      INP [DMT symbols]:    			 4.74           3.74           
      Delay [ms]:           			 7.71           7.67           
      Depth []:           			 448            0.00
      R:                  			 12        	0       

G.997.1 Statistics (Current):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 1       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A

G.997.1 Statistics (last 15 minutes):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 0       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A

G.997.1 Statistics (last 24 hours):        

  Failures:
    Line failures              		 	 Near end
      Loss of signal (LOS):   		 	 0       
      Loss of frame (LOF):    		 	 0       
      Loss of power (LPR):   		 	 0       

  Performance monitoring:
    Line PM:           		 		 Near end
      Error second (ES):     			 1       

    Channel PM:        				 Near end 	Far end
      Bearer 0:
        Code Violation (CV):    		 1        	0       
        FEC:                    		 1699542  	0       

    ATM data path PM:            		 Near end 	Far end
      Bearer 0:
        HEC violation count (HEC):       	 0        	N/A
Click to expand...

It should definitaly be 1024Kbps, call Telkom or go on the live chat and tell them your upload is half speed they should set it to 1Mbps and recreate/reset your port.
 
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