ADSL problem

[benitok]

I need some advice / help with a ADSL problem. Our company are having some problem with our ADSL line. Telkom as usual says there is nothing wrong with the line, as well as the ISP.

The line drops about 6 times a day. Different times of the day, it could be early in the day or late at night. It's off for a second or up to 10 seconds. I know i must drop once a day for Telkom to check the line usage, but not 6 times.

We've changed the routers (different make and model), the telephone cable. I found the following in the new routers log file:

kernel: Intrusion -> IN=ppp_8_35_1 OUT= MAC= SRC=41.244.19*.1** DST=41.243.50.** LEN=48 TOS=0x00 PREC=0x00 TTL=126 ID=19810 DF PROTO=TCP SPT=1143 DPT=135 WINDOW=16384 RES=0x00 SYN URGP=0

Could this have anything to do with the line dropping? Any advice would be appreciated

 

[Yotch]

Can you post some linestats like the upstream and downstream noise margins and attenuations. You should be able to find these on one of the menus in your router. If the noise margin drops too far then the line will drop but there might also be other reasons as you have mentioned. There is also software that you can try like Routerstats or ADSL monitor which will monitor your noise margin figures over time so that you can determine whether or not the cause of the dropouts is due to interference problems. If it's an interference problem a UPS may help if you have one available or you could look at a suitable filter which would be a much cheaper option. If you post your linestats we might be able to offer more advice.

Routerstats
http://www.vwlowen.co.uk/internet/files.htm

ADSL monitor
http://adslm.dohrenburg.org/index-old.php

How to understand linestats
http://mybroadband.co.za/vb/showthread.php?t=88358

Telephone line interference problems
http://mybroadband.co.za/vb/showthread.php?t=84785

 

[benitok]

Can you post some linestats like the upstream and downstream noise margins and attenuations. You should be able to find these on one of the menus in your router. If the noise margin drops too far then the line will drop but there might also be other reasons as you have mentioned. There is also software that you can try like Routerstats or ADSL monitor which will monitor your noise margin figures over time so that you can determine whether or not the cause of the dropouts is due to interference problems. If it's an interference problem a UPS may help if you have one available or you could look at a suitable filter which would be a much cheaper option. If you post your linestats we might be able to offer more advice...

Thanks for the info, I'll check it out. Some more info from the router:

SNR Margin (dB): Downstream 12.3 Upstream 13.0
Attenuation (dB): Downstream 45.0 Upstream 26.0
Output Power (dBm): Downstream 17.7 Upstream 5.6

also

Super Frame Errors: Downstream 86000 Upstream 2110
HEC Errors: Downstream 39656 Upstream 588
OCD Errors: Downstream 2 Upstream 0

 

[Yotch]

Often the SNR Margin may vary quite considerably over time. Currently yours is quite low. See if you can get Routerstats or ADSL monitor to work with your router or keep monitoring the SNR Margin to see if it starts to fall shortly before a dropout.

 

[ic]

What about other devices attached to that ADSL line, e.g. analogue handsets & fax machines etc? - are there any [searchforum]Microfilters[/searchforum] attached?

 

[bwana]

What about other devices attached to that ADSL line, e.g. analogue handsets & fax machines etc? - are there any [searchforum]Microfilters[/searchforum] attached?

Dont forget about an alarm system that might be sharing the line.

 

[|tera|]

Dont forget about an alarm system that might be sharing the line.

Now that you mention that b,

I've made a few posts about it, that our line dropped in the first half of this year and the whole 2006. We recently switched alarm companies and I've been thinking why I haven't had a ppp disconnect in at least 4 months, which is amazing.

Must have been the alarm

 

[ic]

Now that you mention that b,

I've made a few posts about it, that our line dropped in the first half of this year and the whole 2006. We recently switched alarm companies and I've been thinking why I haven't had a ppp disconnect in at least 4 months, which is amazing.

Must have been the alarm

The alarm system's modem needs to go through a microfilter just like any other analogue device attached to an ADSL line.

 

[|tera|]

The alarm system's modem needs to go through a microfilter just like any other analogue device attached to an ADSL line.

I'll have to double check it. They installed a radio today, probably a transmitter, is that also connected to the line?

 

[ic]

I'll have to double check it. They installed a radio today, probably a transmitter, is that also connected to the line?

Usually an alarm system's radio transmitter is a separate [optional] device [box + antenna] and will have nothing to do with the telephone line, your alarm system might still be attached to the telephone line.

Most alarm system companies will attach the alarm system to the telephone line, such that the alarm system is the first device attached to the line which allows the alarm system to seize control of the line if it needs to dial-out, obviously this configuration will mess up your ADSL as a microfilter needs to be inbetween the alarm system and the line, and your ADSL modem|router should be directly attached to the line without going through a microfilter.

 

[|tera|]

Cool, sorry to hijack this thread, not my intension.

So it's possible, that even if it has the transmitter, it's still connected to the line?

 

[ic]

Cool, sorry to hijack this thread, not my intension.

So it's possible, that even if it has the transmitter, it's still connected to the line?

Knowing how slap-jack most alarm system installers are, I would be surprised if they bothered to disconnect the alarm system from your ADSL line.

 

[|tera|]

Knowing how slap-jack most alarm system installers are, I would be surprised if they bothered to disconnect the alarm system from your ADSL line.

You don't know the half of it! The new company installed the transmitter and said they'll send out a quote to revamp the entire system in the house, all the wires weren't even connected and there's about 10 meters of wire tangled next to the panel.

Thanks ic and thanks Benitok I'm out of your thread.

 

[Stalker]

The line drops about 6 times a day. Different times of the day, it could be early in the day or late at night. It's off for a second or up to 10 seconds. I know i must drop once a day for Telkom to check the line usage, but not 6 times

No problem I've had 1260 line drops this month. Telkom eventually replaced the line from the pole to the house and found a clean pair from the nearest junction box. Now having 2-3 drops per day