DSL latency under load

We recently got DSL to use as a backup to our cable modem, since both of us work out of our home, being without network even for a short time is unacceptable. Being used to cable modem for quite a while now (we get a very good deal from US Cable, with high upload and download speed), I have to wonder why anyone would pick DSL. I did some fairly large downloads on the DSL, and noticed ping latency skyrocketing for other traffic. making things like interactive logins etc. pretty much useless. Round trip times went from around 80ms to well over 1,000, with a "load" on the DSL at about 500KB/sec. I've never seen anything like this on any of my cable modems....

See the attached graphs for the inconvenient DSL truth.



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