Thread: bsnl speed dropped

My download speed was decreased from 200-220 kbps to 60-70kpbs.There is no problem with the telephone line and modem.I am using home 500c plan.


I AM USING A UTSTARCOM UT300R2U MODEM


Statistics -- ADSL

Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 2.0 6.1
Attenuation (dB): 64.0 38.5
Output Power (dBm): 12.3 15.1
Attainable Rate (Kbps): 1051 858
Rate (Kbps): 895 860
MSGc (number of bytes in overhead channel message): 27 27
B (number of bytes in Mux Data Frame): 25 49
M (number of Mux Data Frames in FEC Data Frame): 1 1
T (Mux Data Frames over sync bytes): 2 1
R (number of check bytes in FEC Data Frame): 0 0
S (ratio of FEC over PMD Data Frame length): 0.9858 1.9704
L (number of bits in PMD Data Frame): 211 203
D (interleaver depth): 1 1
Delay (msec): 0 0

Super Frames: 44398 45066
Super Frame Errors: 429 5008
RS Words: 0 0
RS Correctable Errors: 0 0
RS Uncorrectable Errors: 0 N/A

HEC Errors: 177 43367
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 1524405 78656401
Data Cells: 223563 3144527
Bit Errors: 0 6799460

Total ES: 427 203635
Total SES: 82 201661
Total UAS: 112 201219

Your SNR and attenuation values seems to be poor. Do you face disconnection problems. Get your line checked by the line man.

bsnl lineman came and checked my line today.He told me that there is nothing wrong with my connection.If you don't mind can please give me an idea about ideal snr margin and annuation rate for my 500c plan

Originally Posted by eaglescs

My download speed was decreased from 200-220 kbps to 60-70kpbs.
I AM USING A UTSTARCOM UT300R2U MODEM

Statistics -- ADSL
Mode: ADSL2+
Rate (Kbps): 895 860

Untile your Rate 895 to 2048 you dont get the 200 to 220KBps download speed.

Go to your ADSL router's GUI web page. Then go to Advance Setup then DSL
Cheak only G.DMT and uncheak all other option

Then save your seetings and restart your router

Then cheak your Line Download rate

Originally Posted by eaglescs

can please give me an idea about ideal snr margin and annuation rate for my 500c plan

Just go through the image link given here, you will come to know how SNR Margin and Line Attenuation affects things.

SNR Margin and Line Attenuation

Attenuation (dB): 64.0 38.5

The problem is with your line iitself...... check for any loose contacts, improper isolations etc.....

Ideally, the values must be as follows.....

Downstream Upstream
SNR Margin (dB): 34.7 18.1
Attenuation (dB): 13.0 5.0
Output Power (dBm): 12.3 -1.7
Attainable Rate (Kbps): 21866 1285
Rate (Kbps): 2045 861
MSGc (number of bytes in overhead channel message): 72 14
B (number of bytes in Mux Data Frame): 24 11
M (number of Mux Data Frames in FEC Data Frame): 1 8
T (Mux Data Frames over sync bytes): 2 7
R (number of check bytes in FEC Data Frame): 16 16
S (ratio of FEC over PMD Data Frame length): 0.4147 3.7966
L (number of bits in PMD Data Frame): 791 236
D (interleaver depth): 64 8
Delay (msec): 6 7

Originally Posted by deepmohan

Just go through the image link given here, you will come to know how SNR Margin and Line Attenuation affects things.

SNR Margin and Line Attenuation

Such Nice information DeepMohan
Thanks a LOT
it is very useful compilation, Sir.
wish you a Very Happy New Year 2010, and incidentally a Happy New Decade also, starting 2010.

Originally Posted by eaglescs

My download speed was decreased from 200-220 kbps to 60-70kpbs.There is no problem with the telephone line and modem.I am using home 500c plan.
I AM USING A UTSTARCOM UT300R2U MODEM
Statistics -- ADSL
Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 2.0 6.1
Attenuation (dB): 64.0 38.5
Output Power (dBm): 12.3 15.1
Attainable Rate (Kbps): 1051 858
Rate (Kbps): 895 860
........

Take a print out of this info and approach the Junior Telecom Officer (JTO) of your area, and seek help to improve your line and net conditions. He would definitely respond.
Please also check whether you plugged the splitter cables wrongly?
the incoming copper pair from BSNL should go to LINE , Modem to DATA or MODEM and finally the phone instrument to PHONE
even if the connecting wires are ( the end plug) are corroded, you suffer this problem.

In case you kept this in a more moist areas or places where chemical fumes come, corrosion is possible. they can be plugged out and and inspected for bright co wires inside. if the wires inside are corroded and look dull, you may locally purchase and replace the interconnecting wires.
BTW, how far are you from your local telephone exchange, any Idea?

My download speed was decreased from 200-220 kbps to 30-35kpbs.There is no problem with the telephone line and modem.I am using home 500C+ plan.
Statistics -- ADSL

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

Downstream Upstream
SNR Margin (dB): 6.3 19.0
Attenuation (dB): 29.0 14.5
Output Power (dBm): 12.1 19.8
Attainable Rate (Kbps): 10522 1436
Rate (Kbps): 9933 830
K (number of bytes in DMT frame): 288 25
R (number of check bytes in RS code word): 6 0
S (RS code word size in DMT frame): 0.5 1
D (interleaver depth): 64 1
Delay (msec): 8 0

Super Frames: 2241 2181
Super Frame Errors: 0 0
RS Words: 304840 0
RS Correctable Errors: 3689 0
RS Uncorrectable Errors: 0 N/A

HEC Errors: 0 0
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 893320 0
Data Cells: 600 0
Bit Errors: 0 0

Total ES: 404 34487
Total SES: 44 33227
Total UAS: 52 32816

Originally Posted by bhrat

My download speed was decreased from 200-220 kbps to 30-35kpbs.

Statistics -- ADSL
Downstream Upstream
SNR Margin (dB): 6.3 19.0
Attenuation (dB): 29.0 14.5

You SNR values are below acceptable limit, get your line checked.

Just go through the image link given here, you will come to know how SNR Margin and Line Attenuation affects things.

SNR Margin and Line Attenuation

Originally Posted by mvs sarma

Such Nice information DeepMohan
Thanks a LOT
it is very useful compilation, Sir.
wish you a Very Happy New Year 2010, and incidentally a Happy New Decade also, starting 2010.

PS: OFFTOPIC

thanks Mr. mvs sarma, and wish you the same.

One cannot say that what will be the ideal SNR Margin and Line Attenuation. But you can read this thread to get an idea:

SNR Margin and Line Attenuation - What do they mean?

Happy New year guys

Thanks everyone for your support.

Today BSNL guys came and checked my connection.They spend around 4 hours working on the cable and changed the cable.Now i am getting download speed around 200-210 kbps.But still my SNR and attenuation rate is not good enough

NEW STATS


Statistics -- ADSL

Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 14.1 5.9
Attenuation (dB): 61.5 36.1
Output Power (dBm): 12.3 15.9
Attainable Rate (Kbps): 3642 900
Rate (Kbps): 2046 861
MSGc (number of bytes in overhead channel message): 27 14
B (number of bytes in Mux Data Frame): 58 11
M (number of Mux Data Frames in FEC Data Frame): 1 8
T (Mux Data Frames over sync bytes): 2 7
R (number of check bytes in FEC Data Frame): 0 16
S (ratio of FEC over PMD Data Frame length): 0.9895 3.8128
L (number of bits in PMD Data Frame): 477 235
D (interleaver depth): 1 1
Delay (msec): 0 0

Super Frames: 91717 93568
Super Frame Errors: 0 11512
RS Words: 0 1570452
RS Correctable Errors: 0 539
RS Uncorrectable Errors: 0 N/A

HEC Errors: 0 79690
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 7224012 205305020
Data Cells: 70950 6180202
Bit Errors: 0 11008057

Total ES: 0 332978
Total SES: 0 328615
Total UAS: 32 327886






Anyways u guys rock...Thanks for your informative replies

SNR Margin (dB): old 2.0 6.1 new 14.1 5.9
Attenuation (dB): 64.0 38.5 : 61.5 36.1

TRY Mod mode GDMT.
Try to exchange the modem.
Your line conditions should improve further.