Re: ADSL connection speed issues

seanwaite · ‎07-30-2012

I have 877 ADSL router with two issues concerning my connection. My first is that my DSL provider does not provide me with a stable service. On a daily basis my connection will drop in the morning and usually reconnects at around 896kbps average. By evening time, usually after 10pm, I can reset the connection and get 3mbps. I have had technician out whose best solution was to pull the 4 ethernet cables out from the back of the 877 switch as they "probably are causing interference". So you see I don't have much hope that things will get better from the ISP's standpoint. So I have three questions I really hoping to find an answer to:

1.) In the morning I would like to restart the connection and connect at a speed of my choosing. While at the time I am connected at say 3mbps at 8am, I know for fact it will drop at any time. I would like to at my convenience restart the connection at a lower speed thus to insure the SNR is within an acceptable range at this time. However I do not know what command to use, and on which interface (assuming ATM 0). Usually it is around this time I see the SNR start to drop (though it is never high to begin with). If I could manually resync at a lower speed I am hoping that the connection would then be in acceptable margin to maintain it during the day.

2.) Is there a quick method to restart the sync? At this time I just pull the physical cable out and reset it. I have 151-4.M3. Was hoping there was a quicj and easy command to resync the connection manually through a SSH connection.

3.) If my connection always, and I mean ALWAYS, is assured to drop in the morning (between 8-9am) with average speed of 800~1mbps, but after 10 to 11pm I can reconnect at 3mbps and maintain a stable connection, does this not seem that there is some interference at my local box? I should add I do live in an apartment building. I have tried to explain this to my ISP, who while on the phone tech support seem sympathetic, the actual technicians coming out don't seem to have a clue on this. I would love to ditch this and go back to cable, but am locked in with a contract.

paolo bevilacqua · ‎07-30-2012

Can you post "show dsl interface".

seanwaite · ‎07-30-2012

877w#sh dsl int

ATM0

Alcatel 20190 chipset information

ATU-R (DS) ATU-C (US)

Modem Status: Showtime (DMTDSL_SHOWTIME)

DSL Mode: ITU G.992.1 (G.DMT) Annex A

ITU STD NUM: 0x03 0x1

Vendor ID: 'STMI' 'IFTN'

Vendor Specific: 0x0000 0x71C5

Vendor Country: 0x0F 0xB5

Chip ID: C196 (0)

DFE BOM: DFE3.0 Annex A (1)

Capacity Used: 73% 67%

Noise Margin: 12.0 dB 17.0 dB

Output Power: 17.0 dBm 12.5 dBm

Attenuation: 56.5 dB 31.5 dB

FEC ES Errors: 0 0

ES Errors: 68 11

SES Errors: 0 0

LOSES Errors: 0 0

UES Errors: 0 0

Defect Status: None None

Last Fail Code: None

Watchdog Counter: 0x26

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction: 0x00

Interrupts: 16537 (0 spurious)

PHY Access Err: 0

Activations: 9

LED Status: ON

LED On Time: 100

LED Off Time: 100

Init FW: init_AMR-4.0.015_no_bist.bin

Operation FW: AMR-4.0.015.bin

FW Source: embedded

FW Version: 4.0.15

Interleave Fast Interleave Fast

Speed (kbps): 3072 0 640 0

DS User cells: 713707 0

US User & Idle cells: 10084743 0

Reed-Solomon EC: 124 0 0 0

CRC Errors: 0 0 0 0

Header Errors: 0 0 0 0

Total BER: 0E-0 0E-0

Leakage Average BER: 0E-0 0E-0

ATU-R (DS) ATU-C (US)

Bitswap: enabled enabled

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 4 6 7 8 9 9 9 9 9 9

010: 9 9 9 9 8 8 8 8 8 8 8 7 7 6 5 5

020: 0 0 0 2 5 5 6 6 7 6 7 8 9 9 A A

030: A A A A A 9 A A B B B B B B B B

040: 0 B B 2 A B B A B B A A A A A A

050: A A A A A A A A A A A 9 9 9 9 9

060: 9 8 9 8 5 8 8 8 8 8 7 5 7 7 7 7

070: 7 7 3 7 7 7 7 7 6 6 6 6 6 6 6 5

080: 0 4 5 5 5 5 5 5 5 5 5 4 4 4 2 2

090: 4 2 3 3 0 2 3 3 3 3 3 3 3 2 2 2

0A0: 0 0 2 2 2 2 2 2 2 2 2 2 2 2 2 2

0B0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0C0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0E0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0F0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

877w#

paolo bevilacqua · ‎07-30-2012

Noise Margin: 12.0 dB 17.0 dB

Output Power: 17.0 dBm 12.5 dBm

Attenuation: 56.5 dB 31.5 dB

As you have said yourself you have a poor pair, far away from CO.

http://www.kitz.co.uk/adsl/linestats.htm

http://www.dslreports.com/faq/16220

You can try another modem brand/type, but I would not expect much better of what you got now.

To force resync

conf t

int atm0

shut

no shut

^Z

johnlloyd_13 · ‎07-31-2012

Hi,

If I were you, I would chase the ISP and ask for an experienced field tech in order to resolve this issue.

Show them your show dsl interface output and compare it with the field tech's reading on his tester.

Sent from Cisco Technical Support iPhone App

seanwaite · ‎08-06-2012

Thanks for the responses. So is there a way I can set the speed on my end? Like I said in the morning I am sure to drop the connection. I would like to do this at my convenience at reconnect at a lower speed instead of waiting for it to randomly drop sometime in the morning. This way I don't have to deal with the stress of waiting to be disconnected when I am working remotely or downloading anything.

paolo bevilacqua · ‎08-06-2012

Check if yuu have "dsl snr-margin" command available, that could help.

seanwaite · ‎08-06-2012

No I don't. What I have is this:

877w(config-if)#dsl ?

enable-training-log enable the fw training log for Showtime and failure cases

lom Loss Of Margin watch counter for line retrain

operating-mode auto or specific ADSL mode

sync ADSL sync preferences

Assuming this command would be under ATM 0

Edit my IOS ver:

Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 15.1(4)M3, RELEASE SOFTWARE (fc1)