reply to algerardi
I had already checked for the lastest firmware . The router is a Dlink-815 which works ok via DSL but erractic via mediacom.That was confusing.
I dont see this issue very often, but some routers do cause speed issues.
I went out and bought a Netgear router and it works ok with Mediacom and bellsouth. So the new Dlink router was flaky.Tks for your assistance .Al
You are welcome. Let me know if you have any other issues.