I am using PTCL DSL internet. Recently, PTCL upgraded all of its connections so that my connection upgraded from 512KB to 1MB. But since then I noticed that my download speed had decreased to average 15KB/sec. I called PTCL and every time the Customer Service guy transferred my call to Technical Section and then I have to wait for ever and no one attend my call. The Customer Service guy was telling me that the Technical Section will help my to set my modem configuration so that the problem will remove. I was wondering that may be anyone of you had gone through same problem and know how to solve this issue. Also PTCL gave me ZTE ZXDSL 831 Series Modem. Can you help me to solve this problem?