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Old 28-07-2012, 19:12   #1
ianch99
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Why the bad connection?

I need help in understand why my 50M is so poor regarding latency and jitter and to a lesser extent speed. I am on the sotn8-2-0 CMTS/UBR at the moment and here is a snapshot of my current BBM graph:

My CMTS line: cpc3-sotn8-2-0-cust***.15-1.cable.virginmedia.com

Snapshot graph:

http://www.thinkbroadband.com/ping/s...8-07-2012.html

and a typical pingtest.net result is:

http://www.pingtest.net/result/67084269.png

This is using a WNR2000v1 router together with my VMNG300 modem. I normally use a DIR-615 running dd-wrt. The DIR-615 shows the same graph profile so I switched to the Netgear to rule out the dd-wrt firmware.

The thing that makes this mysterious is that my neighbour is also on the sotn8-2-0 CMTS (10M product/Media Hub/DOCSIS 2.0) and his graph is totally different (and better!):

His CMTS line: cpc8-sotn8-2-0-cust***.15-1.cable.virginmedia.com

Snapshot graph:

http://www.thinkbroadband.com/ping/s...8-07-2012.html

and a pingtest.net done over wireless at long range(!):

http://www.pingtest.net/result/67084046.png

Same CMTS, same street cab but totally different behaviour. The only conclusion is that my modem is faulty and I would need to switch to the SuperHub sitting in the cupboard ...

Any advice?

BTW, here are my current modem stats:

Upstream

Power Level (dBmV) 46.25

Downstream

Power Level
(dBmV) 0.70 0.50 0.69 -0.36
RxMER (dB) 37.09 36.84 37.36 37.09
Correctable
Codewords 194 234 179 247
Uncorrectable
Codewords 290 300 291 295
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