said by NormanS:he's better off using shaperprobe
Watch your use of CAPs! Emphasis is fine, but there is a conventional notation which distinguishes between kbs and kBs. According to convention, thousands of bits per second is stated as, "kbs", while thousands of Bytes per second is stated as, "kBs".
Furthermore, while speed test normally report kbs, download managers normally report kBs. So it is unclear to me whether you have "13.5 kBs" (which is 1,687 kbs), or 13.5 kbs (which pitiful for a nominal 1536 kbs connection).
So I will request two pieces of information to help me understand. First, your connection statistics from your modem; especially the SNR (or noise margin) and the line attenuation. Second, an online speed test. Either of these: