Carrier Access Adit 3104 user manual Central Office CO, Glossary-6

Glossary

Central Office (CO)

Central Office (CO)	Where telephone companies terminate customer lines and locate switching equipment to
	interconnect those lines with other networks.
channel	A generic term for a communications path on a given medium; multiplexing techniques
	allow providers to put multiple channels over a single medium.
Channel Associated	Carrying signaling information within the data channels of a T1 line (in band) rather than
Signaling (CAS)	on a separate control channel. CAS signaling is also used to carry 911 emergency data such
	as telephone number and location information.
Channel Service Unit	The interface to the T1 line that terminates the local loop.
(CSU)
Classless Inter-Domain	CIDR is a new addressing scheme for the Internet which allows for more efficient
Routing	allocation of IP addresses than the old Class A, B, and C address scheme.
CLEI Codes	Common Language Equipment Identifier codes, that are assigned by Bellcore to provide a
	standard method of identifying telecommunications equipment in a uniform, feature-
	oriented language.
CLI	Command Line Interface
collision	In Ethernet, the result of two nodes transmitting simultaneously. The frames from each
	device impact and are damaged when they meet on the physical media.
command line	The command line is where you enter MS-DOS commands.
compander	Companding is the process of compressing the amplitude range of a signal for economical
	transmission and then expanding them back to their original form at the receiving end.
Demilitarized Zone	A collection of computers that are shielded from both the trusted network and the untrusted
(DMZ)	network by packet-filtering routers and gateways.
Domain Naming System	DNS. A mechanism used in the Internet for translating names of host computers into
(DNS)	addresses.
download	To transfer data from a larger “host” system to a smaller “client” system's hard drive or
	other local storage device.
Dual Tone Multi-	Dual Tone Multi-Frequency is a term describing push button or Touchtone dialing.
Frequency (DTMF)
Dynamic Domain Name	Allows the hosting of a website, FTP server, or e-mail server with a fixed domain name
System (DDNS)	(e.g., www.xyz.com) and a dynamic IP address.
Dynamic Host	DHCP is a network configuration that allows maintenance to be performed from a central
Configuration Protocol	site rather than by end users.
(DHCP)
Earth ground	A wire conductor that terminates in the earth for electrical purposes. It is generally the
	negative side of the circuit and is most important in alternating current (AC) circuits.
	Chassis Ground is the general term used in direct current (DC) circuits.

Glossary-6 Adit 3104 - Release 1.6