isdn
What Is Frame Relay? A Complete CCNA Guide
Frame Relay is a packet-switching telecommunication service designed for interconnecting enterprise LANs over a wide area network. It’s a Layer 2, non-broadcast multi-access (NBMA) WAN technology that allows a single serial interface on a router to connect to multiple remote sites using permanent virtual circuits (PVCs) or, less commonly, switched virtual circuits (SVCs). Though largely...
What Is ISDN? Integrated Services Digital Network Explained
ISDN stands for Integrated Services Digital Network. It’s a circuit-switched technology that uses the local loop of the Public Switched Telephone Network (PSTN) to carry fully digital signals, rather than the analog signals traditional telephone lines were originally designed for. ISDN is a set of communication standards capable of transmitting voice, data, and signaling simultaneously...