frequent DSL connection losses

I have a Linsys router, Epson Ne Printer, and 2 IBM compatible PCs networked. I subcribe to PacBell's DSL service. Almost every other time I try to log-on I am unable to connect due to "an unknown connectivity problem". this message is accompanied by a few suggestions that might as well be "there's something wrong". I am using my dial-up service to ask for help. Any suggestions? I keep resetting the system, rebooting the router and modem, get the system working only to have it repeat the same problems after one or two successful connections. Any help is appreciated.
Tom P.
[email protected]

 

many dsl connections require a special noise filter on the dsl line. if you lack this piece of equipment this may be your problem.

 

Thanks, yes, I have filters on the phones which are required by pacbell. It may be that the Linksys router and the pacbell modem don''t always communicate. Any other suggestions are welcome.
Thanks again.
T. Preston