56k=v.Unreliable
   News and information about 56k modems. Extensive troubleshooting section.
   http://modemsite.com/56k/index.asp

ARC Electronics
   SCADA applications including dial up, leased line modem, cellular modems and wireless
   http://www.arcelect.com/

AirLink Communications, Inc.
   Manufacture CDPD modems, test tools, and vehicle tracking and telemetry systems. Includes product specifications and applications, and career opportunities.
   http://www.airlink.com/

IP-Warehouse
   Simple Source for IP Networks. Dslam DSL equipment online sales.
   http://www.ip-warehouse.com/

Paradyne Corporation
   Designs, develops and manufactures broad band modems for high-speed DSL, WAN, Internet access and multimedia applications.
   http://www.paradyne.com/

Rio Communications
   Modem-related resources.
   http://modems.rosenet.net/