Cisco Systems 78-11450-03 specifications Also Fast Ethernet, Gigabit Ethernet, Ieee, GL-5

Glossary

E

E1	Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 2.048
	Mbps. E1 lines can be leased for private use from common carriers. Compare with T1; see also DS1.
Edge Services	See ESR.
Router
Electromagnetic	See EMI.
interference
Electrostatic	See ESD.
discharge
EMI	Electromagnetic interference. Interference by electromagnetic signals that can cause reduced data
	integrity and increased error rates on transmission channels.
EMP	Electromagnetic pulse. Caused by lightning and other high-energy phenomena. Capable of coupling
	enough energy into unshielded conductors to destroy electronic devices.
ESD	Electrostatic discharge. Discharge of stored static electricity that can damage electronic equipment and
	impair electrical circuitry, resulting in complete or intermittent failures.
ESR	Edge Services Router. A router that aggregates and routes traffic from thousands of low- and
	medium-bandwidth subscriber connections Into a few high-bandwidth connections to the Internet core.
Ethernet	Baseband LAN specification. Ethernet networks use CSMA/CD and run over a variety of cable types
	at 10 Mbps, 100 Mbps, and 1000 Mbps. Ethernet is similar to the IEEE 802.3 series of standards. See
	also Fast Ethernet, Gigabit Ethernet, IEEE 802.3.

F

Fast Ethernet

Fiber-optic cable

Field-replaceable unit

Flash memory

Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times that of the 10BASE-T Ethernet specification, while preserving qualities such as frame format, MAC mechanisms, and MTU. Existing 10BASE-T applications and network management tools can be used on Fast Ethernet networks. The Fast Ethernet specification is based on an extension to the IEEE 802.3 specification. Compare with Ethernet and Gigabit Ethernet. See also 100BASE-Tand IEEE 802.3.

Physical medium capable of conducting modulated light transmission. Compared with other transmission media, fiber-optic cable is more expensive, but it is not susceptible to electromagnetic interference and is capable of higher data rates. Sometimes called optical fiber.

See FRU.

Nonvolatile storage that can be electrically erased and reprogrammed so that software images can be stored, booted, and rewritten as necessary. Flash memory was developed by Intel and is licensed to other semiconductor companies.

	Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
78-11450-03 Rev.B0		GL-5