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+ + 2.1 + WAN Technologies Overview 
  + 2.1.1 + WAN technology 
+ + + + + + +
+ + + A WAN is a data communications network that operates beyond the + geographic scope of a LAN. One primary difference between a WAN and a + LAN is that a company or organization must subscribe to an outside WAN + service provider in order to use WAN carrier network services. A WAN uses data + links provided by carrier services to access the Internet and connect + the locations of an organization to each other, to locations of other + organizations, to external services, and to remote users. WANs + generally carry a variety of traffic types, such as voice, data, and + video. Telephone and data services are the most commonly used WAN + services.

+ + Devices on the subscriber premises are + called customer premises equipment (CPE). + The + subscriber owns the CPE or leases the CPE from the service provider. A + copper or fiber cable connects the CPE to the service provider’s + nearest exchange or central office (CO). This cabling is often called + the local loop, or "last-mile". A dialed call is connected locally to + other local loops, or non-locally through a trunk to a primary center. + It then goes to a sectional center and on to a regional or + international carrier center as the call travels to its destination. +

+

+ + + In order for the local loop to carry data, a device such as a modem is + needed to prepare the data for transmission. Devices that put data on + the local loop are called data circuit-terminating equipment, or data + communications equipment (DCE). The customer devices that pass the + data to the DCE are called data terminal equipment (DTE). + The DCE + primarily provides an interface for the DTE into the communication + link on the WAN cloud. The DTE/DCE interface uses various physical + layer protocols, such as High-Speed Serial Interface (HSSI) and V.35. These protocols establish the codes and + electrical parameters the devices use to communicate with each other. +

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+ + + WAN links are provided at various speeds measured in bits per second + (bps), kilobits per second (kbps or 1000 bps), megabits per second + (Mbps or 1000 kbps) or gigabits per second (Gbps or 1000 Mbps). The + bps values are generally full duplex. This means that an E1 line can + carry 2 Mbps, or a T1 can carry 1.5 Mbps, in each direction + simultaneously. +

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+ + Web Links

+ + +

Introduction to WAN Technologies

+ + http://www.cisco.com/univercd/cc/td/ + doc/ cisintwk/ito_doc/ introwan.htm

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