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Latency issues

Latency issues

Latency issues

Having problems with a wireless connected pc running windows 7 64 bit. Router is D-link DIR 615 and the nic is a DWA 130 rev c USB wireless N. I've had to configure the router to broardcast in G only due to the fact the nic keeps dropping connection in N  even though the router is about 20 feet away with a corner of a wall just about in line of site, there's no interference i.e. phones/microwave etc.

 So my problem is the latency on the windows 7 pc. I ran a test from www.pingtest.net and got the results:
Packet loss = 12%
Ping 1541ms
Jitter 247ms
Then tested on shaw.ca site (my isp) and got the results:
6.6Mbps download speed
70kbps upload speed

I then ran the same test on my laptop running Vista, the laptop is 2 feet away from the router, test results i got were:

Wired to modem
Packet loss 0%
Latency (ping) 18ms
Jitter 4ms
D/L 13.45Mb/s
U/L .97Mb/s

Wired to router
Packet loss 0%
Latency (ping) 28ms
Jitter 13ms
D/L 10.21 Mb/s
U/L .89Mp/s

Packet loss 0%
Latency (ping) 283ms
Jitter 90ms
D/L 7.69Mb/s
U/L .34Mp/s

So, would problems with my wireless connection on the windows 7 be the setup of the USB nic and router? If so does anyone know how to resolve this issue? Or would it be the compatibility with the USB nic and windows 7? Or indeed the o/s itself? If it's the nic, does anyone know of a good compatible nic for pcie

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