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Contributor
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Message 1 of 15

Sudden reduction in Sync speed and added latency

Since I had to reboot my modem a few days ago, my connection speed has reduced by around 8mbit (Current throoughput always used to be 79999kbit/s) and about 20ms of latency has been added to all ping times (seemingly by the first or second hop). My attainable spped is still far above what my line now syncs at, but restarting the modem makes no difference, even leaving it off overnight.

 

I'm using a FritzBox 7490 which has been utterly superb up until now.

 

 

Tracing route to bbc.co.uk [212.58.246.103]
over a maximum of 30 hops:

 

1 3 ms 1 ms 1 ms fritz.box [192.168.0.1]
2 * * * Request timed out.
3 * 32 ms 32 ms 31.55.185.197
4 33 ms 32 ms 32 ms 31.55.185.216
5 36 ms 36 ms 36 ms core4-hu0-1-0-0.faraday.ukcore.bt.net [195.99.127.50]
6 36 ms 47 ms 35 ms peer2-xe8-3-1.telehouse.ukcore.bt.net [213.121.193.111]
7 33 ms 32 ms 32 ms 194.74.65.42
8 * * * Request timed out.
9 35 ms 36 ms 34 ms ae0.er02.cwwtf.bbc.co.uk [132.185.254.90]
10 33 ms 33 ms 35 ms 132.185.255.165
11 35 ms 33 ms 33 ms fmt-vip132.cwwtf.bbc.co.uk [212.58.246.103]

 

(The first and second hop timeouts have always happened)

 

It looks like something is going on with either the first or second hop in my connection. I am on the Staines exchange.

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Contributor
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Message 2 of 15

Re: Sudden reduction in Sync speed and added latency

Doing a trace from another Infinity connection on the same exchange but different cab shows the issue is almost certainly caused by one of the first two hops in my connection.

1 2 ms 3 ms 2 ms BTBusinessHub.home [192.168.1.254]
2 7 ms 8 ms 6 ms 217.32.147.99
3 11 ms 7 ms 7 ms 217.32.147.126
4 11 ms 10 ms 10 ms 212.140.206.90
5 11 ms 11 ms 10 ms 217.41.169.247
6 11 ms 12 ms 11 ms 217.41.169.109
7 10 ms 10 ms 10 ms acc2-xe-1-3-0.sf.21cn-ipp.bt.net [109.159.251.203]
8 21 ms 17 ms 19 ms core1-te0-2-2-0.ilford.ukcore.bt.net [109.159.251.145]
9 16 ms 15 ms 17 ms 195.99.127.17
10 * * * Request timed out.
11 * * * Request timed out.
12 47 ms 46 ms 46 ms host***.range***.btcentralplus.com [86.178.115.***]
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Message 3 of 15

Re: Sudden reduction in Sync speed and added latency

Today things are even worse. Seems my cab has decided to throttle my connectioj even more even though the attainble rate is as it always has been above BT's current maximummdownlosd rate. I just need somebody who is able to reset the profile.

 

 

The BT Speedtester shows just how messed up it has become. Before this I've had years of everything syncing at the msximummpossible values.

 

 

Thanks for reading.

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Distinguished Guru
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Message 4 of 15

Re: Sudden reduction in Sync speed and added latency

Do you have a Homehub 5 ?
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Message 5 of 15

Re: Sudden reduction in Sync speed and added latency

No. I use my own equipment. Currently a Fritz Box 7490. Previous to that a Draytek 2750n. I originally had the horrible white box and some ancient HH2/3 that I used for about a day.

 

It really does look like something is wrong with the equipment in the cab or exchange, especially given the added 15-20ms of latency added to everything.

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Distinguished Guru
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Message 6 of 15

Re: Sudden reduction in Sync speed and added latency

Your noise margin is 9 instead of 6 which indicates DLM has taken an interest in your line presumably due to disconnections. INP has also been added to your line. Also your IP Profile does not seem to match your sync speed.

This all points to the Fritzbox being the problem.
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Message 7 of 15

Re: Sudden reduction in Sync speed and added latency

Thanks for looking, but I don't accept that is the cause. I have used my own equipment for years, the Fritz Box has been in for months without issue. Suddenly added latency and reduced speed from nowhere.

If this had occurred shortly after I changed from the Draytek to the Fritz Box I may have accepted it as being at fault. But given how much time has elapsed since I installed the device I think it is a conveniant get out rather than the root fault.

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Message 8 of 15

Re: Sudden reduction in Sync speed and added latency

As the router is responsible for updating the IP Profile and your IP Profile is wrong, I wonder what else you could possibly blame?
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Message 9 of 15

Re: Sudden reduction in Sync speed and added latency

I'm going to take a punt on something upstream on my modem, given the 15-20ms of latency that has suddenly been added to everything. According to the stats latency between me and the cab is 6ms, the next hop is 30+. Another VDSL connection on the same exchange but different cab goes 7ms -> 11ms. This would indicate to me that something is amiss with the equipment between the cab and exchange.
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Message 10 of 15

Re: Sudden reduction in Sync speed and added latency

You can't see the cab on a traceroute.
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If you found this post helpful, please click on the star on the left
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