nal computers. DVB (Digital Video Broadcasting) standard approved by the European Telecommunications Standards Institute (ETSI). It has lower resolution than HDTV. DWDM (Dense Wavelength Division Multiplexing) A way of increasing the capacity of fiber-optic networks. DWDM carries multiple colors of light, or multiple wavelengths, on a single strand of fiber. Also known as Wavelength Division Multiplexing (WDM). The European standard for T1. E1 has a speed of 2.048 megabits with 30 channels for voice, data, or video, plus one channel for signaling and one for diagnostics. The European standard for T3. E3 has a speed of 34.368Mbps with 480 channels. It is equivalent to 16 E1 circuits. www.TechnicalPDF.com E-911 (Enhanced 911) The capability for agents who answer 911 calls to receive the callers' phone numbers and locations. EDGE (Enhanced Data Rates for Global Evolution) EDGE mobile services offered by cellular carriers have higher data rates than second-generation cellular networks. EDGE is often used by carriers as they transition to higher-data-rate, third-generation mobile service. end offices The central offices connected to end users and to tandem central offices. Most end offices are based on circuit switching, but they are slowly being converted to softswitch technology to carry VoIP. endpoint Any device connected to LANs, such as computers, printers, and VoIP telephones. Ethernet Based on the 802.3 standard approved by the IEEE. It defines how data is transmitted on and retrieved from LANs. It is used by devices such as personal computers to access the LAN and to retrieve packets carried on the exabyte (EB) A unit of measurement to indicate the number of bytes in storage networks. An exabyte is equal to 1,000,000,000,000,000,000 bytes or 1 billion gigabytes. A byte is equal to 8 bits, or one character. FDDI (Fiber-Distributed Data Interface) An ANSI-defined protocol in which computers communicate at 100Mbps over fiber-optic cabling. FDDI www.TechnicalPDF.com can be used on backbones that connect LAN segmen