India Broadband Forum

dlalhosn · 03-03-09, 10:00 PM

Thanks just4kix it was good to about it...can u also state the difference (Vendor ID (Local/Remote):TMMB / BDCM)

//Moderator note: You have not activated your account. Please click on the link in the mail you received from the forum admin in your mailbox. Failure to do so will cause all your posts go into moderation. - just4kix

dlalhosn · 03-05-09, 11:27 AM

Thanks just4kix it was good to about it...can u also define Vendor ID (Local/Remote): TMMB / BDCM

dlalhosn · 03-09-09, 02:22 AM

>>>

essbebe · 03-09-09, 09:00 AM

@dlalhosn

Quote:

can u also define Vendor ID (Local/Remote): TMMB / BDCM

Usually none checks these !
snr attn power line speed check itself
gives some idea about line conditions.

PARA TW0: for more information :

From GOOGLE search :

Vendor ID (Local/Remote): TMMB / BDCM

Quote:

TMMB in the speedtouch is actually broadcom, its just speedtouch want to be special.
You can get the firmware and the upgrade utility here.
h t t p://xxxxxxxxx/routers/( *redirects to wrong website

Quote:

5 CPE Vendor ID to Integrated Circuit Manufacturer

5.1 ADSL/ADSL2+

ALCB = Alcatel (now ST Micro)
ANDV = Analog Devices
BDCM = Broadcom
GSPN = Globespan
IFTN = Infineon
STMI = ST Micro
TMMB = Thomson Multimedia Broadband

REF:xDSL KnowledgeBase - www.hardwarezone.com.sg

anbutorrent · 03-24-09, 12:00 AM

How do I measure / check my SNR & line attenuation ?
Totally am new to brandband as sombody said i have logged into the moderm but i dont knoe how to get thsi information (i didn't find any text "SNR" or "line attenuation")

My system Config
OS:windowsXP
Modem

NA-A211-I

below is the image of my router's login page

h**p:// img136.imageshack.us /img136/8620/ modem.jpg

essbebe · 03-24-09, 01:27 AM

under Device info/Statistics ADSL

Device Info
Summary
WAN
Statistics
LAN
WAN
ATM
ADSL
Route
ARP
DHCP
......
...............
DSL
Diagnostics
Management

Quote:

Statistics -- ADSL

Mode: ADSL2 AnnexM EU-56
Type: Fast
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 30.3 9.6
Attenuation (dB): 7.5 29.2
Output Power (dBm): -16.7 6.0
Attainable Rate (Kbps): 11684 1787
Rate (Kbps): 2063 519

anbutorrent · 03-24-09, 09:23 AM

h**p:// i40.tinypic.com /2i0g7f5.jpg

i got the result thanks for ur help!

check it out please did I have do anything for my torrent speed to increase
now iam getting average 120KBps, highest 180KBps

i Downloaded axxo torrents form mininova.org

i have these problem also ht*p://www .indiabroadband. net/bsnl-broadband/16371-limited-no-connectivity-bridge-mode-guys-plz-help-me.html

config:
TCP/IP connection changed to 50
Utorrent
setting half** to 50
OS: WInXP sp2
modem : bridge mode

essbebe · 03-24-09, 06:23 PM

@anbutorrent
The link given wrongly. It should be png instead of jpg.
Your ADSl stats are fine.
Default
i40.tinypic.com/2i0g7f5.png
img136.imageshack.us/img136/8620/modem.jpg

You can copy /paste the links as above and delete http and www to avoid errors.
Also when you go to Advanced settings in this page you can upload the image as annexure.

Para two:
Please type 192.168.1.1/look.html
to find out FW for this modem.
Please post data.

anbutorrent · 03-26-09, 07:10 AM

Quote:

192.168.1.1/look.html

i had tried this page but nothing comes up! blank page

jssrk · 06-30-09, 11:04 PM

SNR (Downstream) 20.5 dB
SNR (Upstream) 19.0 dB
Line Attentuation(Downstream) 28.0 dB
Line Attentuation(Upstream) 13.0 dB

this is my result...please do comment on its improvements and all

just4kix · 06-30-09, 11:42 PM

There is not much the user can do to improve SNR/Line Attenuation. It is all the characteristic of the phone line.

All that be done is check the phone line at the junction box. The contacts get oxidised in time. Cleaning the contacts can help. But you have to know which is your own line.

Some of the techies have claimed that switching mode from ADSL2+ to G.dmt improves the SNR slightly. No idea. In my case, it made no difference.

essbebe · 07-01-09, 02:15 AM

Tutorials - ADSL > Understanding Line Loss and Measurements

Improving your loss figures.

Tutorials - ADSL > Understanding Line Loss and Measurements

short extract : conclusions

Quote:

Unfortunately there is little you can do about the actual line itself
other than get it maintained by BT. But you can take some steps
to ensure that you are not adding more than the minimum loss yourself:

1... Use good quality Splitter / Filters.

2. ...Use good quality extension cables.

3. .....Ensure that where you plug into cable sockets
......... that the pins are clean and bright.
.......... It has been known for the connections here to corrode with time
.............and you could try pulling out and re-inserting the plug into
..............the BT socket several times to polish the connections.

Hopefully the above information will have been useful to those
who wanted to know more about their ADSL connection

Luke Skywalker · 07-16-09, 04:28 PM

SNR is not simply the ratio of signal value to noise value. It is the ratio of signal power to noise power ratio. It is a unit less quantity.
Whenever a ratio is expressed in decibel it means 10 times the logarithm base of 10 of the ratio.

(Source Electronics Comm. Systems , George Kennedy 3ed)

Otherwise this thread is quite helpful & fabulous.

just4kix · 07-16-09, 05:20 PM

Thanks Luke.

--------

@all, I was checking "SNR+Line Attenuation" keywords in Google. A search result found many hits and Admin should be very happy to note that this article comes right on top of the search results (3rd).

There were many forum linkss, and many have given a link to this article.

rafeeque · 07-20-09, 01:36 PM

Quote:

Originally Posted by just4kix

There have been many posts regarding SNR and Line Attenuation.

SNR
SNR means Signal to Noise Ratio. Simply put divide the Signal value by Noise Value and you get SNR. You need high SNR for a stable connection. In general, a higher signal to noise ratio will result in less errors.

6bB. or below = Bad and will experience no line synchronisation and frequent disconnections
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no disconnection problems
20dB-28dB. = Excellent
29dB. or above = Outstanding

Note that most modems display value as SNR Margin and not pure SNR.

SNR Margin
You can think of SNR margin as the measure of quality of the service; it defines the ability of the service to work error free during noise bursts.

This is a measure of the difference between your current SNR and the SNR that is required to keep a reliable service at your connection speed. If your SNR is very close to the minimum required SNR, you are more likely to suffer intermittent connection faults, or slowdowns. You need a high margin to ensure that bursts of interference don't cause constant disconnections.

With traditional broadband, the higher the SNR Margin, the better. With MaxDSL the faster speeds are only available as a trade-off with what your line can reliably support. The Target SNR Margin is about 6dB. If your broadband is provided through an LLU (Local Loop Unbundled) network, this target SNR Margin may be as high as 12dB.

Line Attenuation
In gerneral, attenuation is the loss of signal over distance. Unfortunately, dB loss is not just dependent on distance. It also depends on cable type and gauge (which can differ over the length of the cable), the number and location other connection points on the cable.

20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB. and above = Bad and will experience connectivity issues

Line attenuation also affects your speed.

75 dB+: Out of range for broadband
60-75 dB: max speed up to 512kbps
43-60dB: max speed up to 1Mbps
0-42dB: speed up to 2Mbps+

Please comment on this article.

(and if you give me reputation on this, I shall return the favour)

nice presentation!!!!! . really informative. CONGRATESSSSSSSS.....
still little more needed for me......... wht is the difference between local snr margin and remote snr margin. is there any significance by knowing these value ? also local line attenuation and remote line attenuation............... can these values help to identify the problem. my values i will give below please make a comment and direction.

local line attenuation: 47.5 dB
Remote line attenuation: 26.5 dB
local SNR margin: 20 dB
remote snr margin: 6 dB
Local Tx power: 12.4 dB
Remote tx power: 16.7 dB

Quote:

Originally Posted by just4kix

There have been many posts regarding SNR and Line Attenuation.

SNR
SNR means Signal to Noise Ratio. Simply put divide the Signal value by Noise Value and you get SNR. You need high SNR for a stable connection. In general, a higher signal to noise ratio will result in less errors.

6bB. or below = Bad and will experience no line synchronisation and frequent disconnections
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no disconnection problems
20dB-28dB. = Excellent
29dB. or above = Outstanding

Note that most modems display value as SNR Margin and not pure SNR.

SNR Margin
You can think of SNR margin as the measure of quality of the service; it defines the ability of the service to work error free during noise bursts.

This is a measure of the difference between your current SNR and the SNR that is required to keep a reliable service at your connection speed. If your SNR is very close to the minimum required SNR, you are more likely to suffer intermittent connection faults, or slowdowns. You need a high margin to ensure that bursts of interference don't cause constant disconnections.

With traditional broadband, the higher the SNR Margin, the better. With MaxDSL the faster speeds are only available as a trade-off with what your line can reliably support. The Target SNR Margin is about 6dB. If your broadband is provided through an LLU (Local Loop Unbundled) network, this target SNR Margin may be as high as 12dB.

Line Attenuation
In gerneral, attenuation is the loss of signal over distance. Unfortunately, dB loss is not just dependent on distance. It also depends on cable type and gauge (which can differ over the length of the cable), the number and location other connection points on the cable.

20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB. and above = Bad and will experience connectivity issues

Line attenuation also affects your speed.

75 dB+: Out of range for broadband
60-75 dB: max speed up to 512kbps
43-60dB: max speed up to 1Mbps
0-42dB: speed up to 2Mbps+

Please comment on this article.

(and if you give me reputation on this, I shall return the favour)

nice presentation!!!!! . really informative. CONGRATESSSSSSSS.....
still little more needed for me......... wht is the difference between local snr margin and remote snr margin. is there any significance by knowing these value ? also local line attenuation and remote line attenuation............... can these values help to identify the problem. my values i will give below please make a comment and direction.

local line attenuation: 47.5 dB
Remote line attenuation: 26.5 dB
local SNR margin: 20 dB
remote snr margin: 6 dB
Local Tx power: 12.4 dB
Remote tx power: 16.7 dB

07-20-09, 07:24 PM

Please take a look at the values. I am facing a minor disconnection problem. At times pages take time to load. I tried BSNL and OpenDNS.

SNR (Downstream) 42.0 dB
SNR (Upstream) 13.5 dB
Line Attentuation(Downstream) 13.0 dB
Line Attentuation(Upstream) 7.0 dB

power_downloader · 08-03-09, 06:54 PM

I have Home 500 C plan. I cannot stay connected for more than 20 min.Suddenly while surfing my speed becomes 0 kB/s for no reason .When I look at my router I see the yellow DSL light blinking which means that its reconnecting(I'm using pppoe mode).The green internet light always blinks.I have read somewhere it means that my connection is out of sync. While surfing this site after every 10-20 min I get a message to log in again which may be because my IP changes after reconnection.Is my SNR too low ?

What are super frame errors ? Are they causing problem?

router:Siemens sl2_141
plan:500C
OS:Windows XP pro

08-03-09, 07:18 PM

Your SNR values are too low.

power_downloader · 08-04-09, 04:33 PM

I complained to BSNL .They told me that my phone line is OK because they can't hear any noise in my phone

I don't think anybody at the office knows what SNR is.

what should I do now

deepmohan · 08-04-09, 11:45 PM

Ask them to check your line completely, for faults like loop.

Check whether the line cable comming to your house is all right there should not be any cut and joints it should be a single direct cable.

03-24-09, 12:00 AM	#45
anbutorrent Junior Member Join Date: Mar 2009 Location: Chennai,India Posts: 13 Rep Power: 1	How do I measure / check my SNR & line attenuation ? Totally am new to brandband as sombody said i have logged into the moderm but i dont knoe how to get thsi information (i didn't find any text "SNR" or "line attenuation") My system Config OS:windowsXP ModemNA-A211-I below is the image of my router's login page h**p:// img136.imageshack.us /img136/8620/ modem.jpg

03-24-09, 09:23 AM	#47
anbutorrent Junior Member Join Date: Mar 2009 Location: Chennai,India Posts: 13 Rep Power: 1	h*p:// i40.tinypic.com /2i0g7f5.jpg i got the result thanks for ur help! check it out please did I have do anything for my torrent speed to increase now iam getting average 120KBps, highest 180KBps i Downloaded axxo torrents form mininova.org i have these problem also htp://www .indiabroadband. net/bsnl-broadband/16371-limited-no-connectivity-bridge-mode-guys-plz-help-me.html config: TCP/IP connection changed to 50 Utorrent setting half** to 50 OS: WInXP sp2 modem : bridge mode Last edited by anbutorrent; 03-24-09 at 01:48 PM.

06-30-09, 11:42 PM	#51
just4kix Platinum Member Join Date: Dec 2007 Location: Pune Posts: 8,899 Blog Entries: 6 Rep Power: 19	There is not much the user can do to improve SNR/Line Attenuation. It is all the characteristic of the phone line. All that be done is check the phone line at the junction box. The contacts get oxidised in time. Cleaning the contacts can help. But you have to know which is your own line. Some of the techies have claimed that switching mode from ADSL2+ to G.dmt improves the SNR slightly. No idea. In my case, it made no difference. __________________ * Never argue with an idiot * To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. \| To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. \| To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. -------------------------------------------------------------------------------------------

08-04-09, 04:33 PM	#59
power_downloader Junior Member Join Date: Jun 2009 Location: 26° 51′ N, 80° 54′ E Posts: 28 Rep Power: 1	Frequent disconnections I complained to BSNL .They told me that my phone line is OK because they can't hear any noise in my phone I don't think anybody at the office knows what SNR is. what should I do now

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India Broadband Forum

SNR Margin and Line Attenuation - What do they mean?

SNR Margin and Line Attenuation - What do they mean?

Similar Threads

03-03-09, 10:00 PM	#41
dlalhosn Junior Member Join Date: Mar 2009 Posts: 4 Rep Power: 0	Thanks just4kix it was good to about it...can u also state the difference (Vendor ID (Local/Remote):TMMB / BDCM) //Moderator note: You have not activated your account. Please click on the link in the mail you received from the forum admin in your mailbox. Failure to do so will cause all your posts go into moderation. - just4kix

03-05-09, 11:27 AM	#42
dlalhosn Junior Member Join Date: Mar 2009 Posts: 4 Rep Power: 0	Thanks just4kix it was good to about it...can u also define Vendor ID (Local/Remote): TMMB / BDCM

03-09-09, 02:22 AM	#43
dlalhosn Junior Member Join Date: Mar 2009 Posts: 4 Rep Power: 0	>>>

03-24-09, 06:23 PM	#48
essbebe Platinum Member Join Date: Aug 2007 Location: Chennai Posts: 4,246 Rep Power: 12	@anbutorrent The link given wrongly. It should be png instead of jpg. Your ADSl stats are fine. Default i40.tinypic.com/2i0g7f5.png img136.imageshack.us/img136/8620/modem.jpg You can copy /paste the links as above and delete http and www to avoid errors. Also when you go to Advanced settings in this page you can upload the image as annexure. Para two: Please type 192.168.1.1/look.html to find out FW for this modem. Please post data.

06-30-09, 11:04 PM	#50
jssrk Junior Member Join Date: May 2009 Age: 19 Posts: 27 Rep Power: 1	SNR (Downstream) 20.5 dB SNR (Upstream) 19.0 dB Line Attentuation(Downstream) 28.0 dB Line Attentuation(Upstream) 13.0 dB this is my result...please do comment on its improvements and all

07-16-09, 04:28 PM	#53
Luke Skywalker Jedi knight Join Date: Jul 2009 Location: IBF Age: 21 Posts: 1,818 Rep Power: 5	SNR is not simply the ratio of signal value to noise value. It is the ratio of signal power to noise power ratio. It is a unit less quantity. Whenever a ratio is expressed in decibel it means 10 times the logarithm base of 10 of the ratio. (Source Electronics Comm. Systems , George Kennedy 3ed) Otherwise this thread is quite helpful & fabulous.

07-16-09, 05:20 PM	#54
just4kix Platinum Member Join Date: Dec 2007 Location: Pune Posts: 8,899 Blog Entries: 6 Rep Power: 19	Thanks Luke. -------- @all, I was checking "SNR+Line Attenuation" keywords in Google. A search result found many hits and Admin should be very happy to note that this article comes right on top of the search results (3rd). There were many forum linkss, and many have given a link to this article.

07-20-09, 07:24 PM	#56
meetdilip Guest Posts: n/a	Please take a look at the values. I am facing a minor disconnection problem. At times pages take time to load. I tried BSNL and OpenDNS. SNR (Downstream) 42.0 dB SNR (Upstream) 13.5 dB Line Attentuation(Downstream) 13.0 dB Line Attentuation(Upstream) 7.0 dB

08-03-09, 07:18 PM	#58
meetdilip Guest Posts: n/a	Your SNR values are too low.

08-04-09, 11:45 PM	#60
deepmohan Platinum Member Join Date: Jan 2009 Location: Chennai Posts: 810 Rep Power: 3	Ask them to check your line completely, for faults like loop. Check whether the line cable comming to your house is all right there should not be any cut and joints it should be a single direct cable.

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