2.2 WAN Devices
2.2.1 Fundamental WAN devices
WANs use numerous types of devices, including the following:
  • Routers, which offer many services, including LAN and WAN interface ports. 
  • WAN switches, which connect to WAN bandwidth for voice, data, and video communication.
  • Modems, which interface voice-grade services. Modems include CSUs/ DSUs and TA/NT1 devices that interface ISDN services.
  • Communication servers, which concentrate dial-in and dial-out user communication.

The Figure shows the icons used for these WAN devices.

Web Links
WAN Introduction