Cisco Systems 80O SERIES manual GL-2

Glossary

EMI	Electromagnetic interference. The interference by electromagnetic signals that
	can cause reduced data integrity and increased error rates on transmission
	channels.
ESD	Electrostatic discharge. A transfer of electrostatic charge between bodies of
	different electrostatic potentials, such as an operator and a piece of electrical
	equipment. ESD occurs when electronic components are improperly handled
	and can damage equipment and impair electrical circuitry. ESD is more likely to
	occur with the combination of synthetic fibers and dry atmosphere.

F

Flash memory

H

HUB/NO HUB button

The nonvolatile storage that can be electrically erased and reprogrammed so that data can be stored, booted, and rewritten as necessary.

The Cisco 800 series routers provide a HUB/NO HUB button. This button is associated with the Ethernet port on Cisco 801 and Cisco 802 routers and with Ethernet port Ø on Cisco 803 and Cisco 804 routers. The setting of this button determines the cable type (straight-through or crossover) that you use to connect an Ethernet device. This button is the equivalent of the TO HUB/TO PC button on the Cisco 802 IDSL and Cisco 804 IDSL routers.

I

IDSL	ISDN Digital Subscriber Line. A digital communication protocol that uses an
	ISDN line and supports line rates up to 144 kilobits per second (kbps).
ISDN	Integrated Services Digital Network. A communication protocol that permits
	telephone networks to carry data, voice, and other source traffic.

N

NIC	Network interface card. A board that provides network communication
	capabilities to and from a computer system. Also called an adapter.
NT1	Network Termination 1. A device that provides the interface between equipment
	on the customer and ISP premises.

Cisco 800 Series Routers Hardware Installation Guide

GL-2 78-5373-04