I just went to the web site for BEC technologies, & what i've always called a modem is a modem/router.here's a little info about it.
High performance ADSL2+ Modem/Router

High Speed Internet Access with ADSL2+, backward compatible to ADSL
Easy Network Management
Support Virtual Private Network (VPN) Pass-through
Express Internet Access
With BEC 5200S is an easy-to-use and economical pack of ADSL2+ Modem/Router perfectly design for home users to enjoy the high speed Internet. The router lets you share high-speed ADSL Internet connection. The web-based Graphic User Interface allows you to install and manage your network easily.
don't know if this has anything to do with the problem. this stuff's pretty much over my head.