Notes_7 - INTERNETWORKING NOTES 7.1 WAN CONCEPTS WANs can...

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INTERNETWORKING NOTES 7.1 WAN CONCEPTS WANs can use one of several cable standards. When you contract for WAN services, you will need to understand your bandwidth needs to choose the appropriate cabling option. The table below describes common WAN carriers.
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WAN FACTS A generic wide area network uses the following components: WANs employ one of the two following methods to transfer data: The following table describes common WAN services that are used to connect two networks through a WAN. PUBLIC SWITCHED TELEPHONE NETWORK. The PSTN is the network used for placing local and long- distance phone calls. The PSTN is a circuit switched network; a dedicated circuit is established when the call is placed and remains in place throughout the call. The local loop uses analog signals over POTS (regular telephone cable wires). The long-distance network typically uses digital signaling over fiber optic. End-to-end speeds are limited to 56 Kbps, a limitation imposed by the limitations of POTS in the local loop at each end. A modem is required to convert digital signals to analog. The PSTN is used by remote access clients to access the network, or as a temporary or backup connection between sites.
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INTEGRATED SERVICES DIGITAL NETWORK (ISDN). Integrated Services Digital Network (ISDN) is a WAN technology that provides increased bandwidth within the local loop. There are two forms of ISDN: ISDN BRI (basic rate interface) uses digital signals over POTS. The traditional phone line is divided into
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  • Spring '16
  • Frame Relay, X.25, Integrated Services Digital Network, packet switching technology

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