North American Network Operators Group|
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why upload with adsl is faster than 100M ethernet ?
Hi, I met a question with upload speed and network access speed. One of our customer lease two lines from us. One is 2Mbps ADSL line the other is 100Mbps fiber ethernet link. The customer needs to upload files to server in Japan usually. Now, the customer complaint that the upload speed of ADSL is much slower than fiber link. For a 5MB file, it takes 420 seconds with fiber link to finish uploading while the time for ADSL is 170 seconds. There is no difference in routing path between ADSL far end and fiber ethernet far end other than the access method. ( from the first acess router ). We measured the latency between our core router and customer's computer, and find there is no packet loss between with both line while latency on ADSL is 0.3ms higher than fiber ethernet. And, no link along the path inside our network is over burdened. That is, bottleneck locates somewhere outside our network. And there is asymetric route between our network and Japan server. But, why TCP throughput experience so much difference between ADSL acess and fiber link access? Thanks. Joe __________________________________________________ Do You Yahoo!? Log on to Messenger with your mobile phone! http://sg.messenger.yahoo.com