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.
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