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A Certification Authority (CA) issues certificates and guarantees the identity of each certificate owner.

Call filtering is used to determine if a packet should be allowed to trigger a call. Outgoing packets

must undergo data filtering before they encounter call filtering.

Configure call time periods to restrict and allow access for users on remote nodes.

Call waiting allows you to place a call on hold while you answer another incoming call on the

same telephone (directory) number.

Staying in a "safe" place once a hacker has broken into a system. The term can be used with

a physical location, electronic reference or an entry point for future attacks.

In telephone networks that use CAS (Channel Associated Signaling), each channel carries both

the control signal and voice signal. CAS is commonly used in America.

Constant Bit Rate is an ATM service category that provides a fixed amount of bandwidth

for streaming data (like voice or video). The bandwidth is always reserved, even when streaming

data is not being sent.

In telephone networks that use CCS (Common Channel Signaling), one channel carries the

control signal and a separate channel carries the voice signal. CCS is commonly used in Europe.

This is a name used by telephone companies for call-related information.

This is the data packet unit that ATM transmits. One cell consists of 53 bytes.

Certificates (also called digital IDs) can be used to authenticate users. Certificates are based

on public-private key pairs. They provide a way to exchange public keys for use in authentication.

A certification path is the hierarchy of certification authority certificates that validate a certificate.

A certification request contains identifying information and public keys. You can send a certification request

to a certification authority. The certification authority signs the certification request and issues a certificate.

A channel is a radio frequency used by a wireless device. Channels available depend on your geographical area.

Challenge Handshake Authentication Protocol is an alternative protocol that avoids sending

passwords over the wire by using a challenge/response technique.

Text that has been scrambled or encrypted so that it cannot be read without deciphering it. See Encryption.

The carrier programs virtual circuits into the network between your sites and charges customers

for a specific level of service called the committed information rate (CIR). The CIR is a negotiated

rate and is basically a guarantee that the carrier will always have that bandwidth available.

This is a network that sets up a temporary physical circuit when a telephone receiver is picked up

(goes off hook) and holds the circuit open until it receives a disconnect signal.

This is the use of switches to set up a dedicated physical connection between two endpoints

until it receives a disconnect signal.

This is a PSTN (Public Switched Telephone Network) switch in a CO.

An administrator clears an alarm after solving its cause. When an alarm is cleared, it is

removed from the current alarm screen and becomes an historical alarm.

A Competitive Local Exchange Carrier is a Local Exchange Carrier (LEC) that competes

with the market leading or Incumbent LEC (ILEC). This type of carrier may offer Internet

Access, video on demand/cable TV, long distance or local exchange service. It also includes

wireless (cellular/PCS) providers.

A command line interface is an interface in which you enter predefined commands at a command

prompt (the command line) to modify, configure and display information about a device or devices.

A software program that is used to contact and obtain data from a server software program

on another computer. Each client program is designed to work with one or more specific kinds

of server programs and each server requires a specific kind of client. A web browser, for example,

is a specific kind of client.

Cluster management allows you to manage switches through one switch, called the cluster manager.

The switches must be directly connected and be in the same VLAN group so as to be able to

communicate with one another.

The cluster manager is the switch through which you manage the cluster member switches.

The cluster members are the switches being managed by the cluster manager switch.

Clustering candidates are switches that are potential cluster members.

Certificate Management Protocol (CMP) is a TCP-based certificate enrollment protocol

that was developed by the Public Key Infrastructure X.509 working group of the Internet

Engineering Task Force (IETF) and is specified in RFC 2510.

A CO is a facility that serves local telephone subscribers. In the CO, subscribers' lines are

joined to switching equipment that allows them to connect to each other for both local

and long distance calls.

This type of cable has a braided copper shield that surrounds a single insulated copper wire.

COE is where home and office phone lines terminate and connect to a much larger switching system.

The communications port is used for local management of the device. In some devices,

it may also be used for uplinking.

This is the background noise a device generates to fill moments of silence when neither party is speaking.

This is the SNMP equivalent of a password.

This is a method of reducing the size of a signal.

Set the CON/AUX switch to the "CON" side when using the CON/AUX port as a regular console

port for local device configuration and management. Set this switch to the "AUX" side when using

the CON/AUX port as an auxiliary dial-up WAN connection.

This is a device (usually a computer) that you use to manage a networking device via a

serial port (RS232) connection.

Content filtering restricts or blocks access to certain web features or content from web pages.

A string of characters saved by a web browser on the user's hard disk.

This refers to switching offices and the transmission plants that link them together. Competing

Interchange networks connect Core Networks in the US, while in other countries, the Core

Networks reach to the borders of the country they are in.

Techniques, programs or other tools that can protect your computer against threats.

Coverage, or range, is the distance over which wireless devices can communicate.

CPE is privately-owned telecommunication equipment at an individual or organization's site that is

attached to the telecommunication network.

Another term for hackers. Generally, the term cracker refers specifically to a person who maliciously

attempts to break encryption, software locks or network security.

Programs used to break into computers. Cracker tools are widely distributed on the Internet.

They include password crackers, Trojans, viruses, war-dialers and worms.

This is the act of breaking into computers, bypassing passwords or licenses in a computer

program or intentionally breaching computer security.

CRC is a method of checking for errors in data that has been transmitted on a communications link.

A CRL (Certificate Revocation List) is a directory of certificates that have been revoked

before their scheduled expirations.

A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+. This cable

connects two similar devices, for example, two data terminal equipment (DTE) or data

communications equipment (DCE) devices.

Crosstalk is noise emanating from the signals transmitted on adjacent wire pairs caused

by electric or magnetic fields of one telecommunication signal affecting the signal in an adjacent circuit.

Crosstalk, in wireless network applications, occurs when the radio signals from access points

overlap and interfere with one another thus reducing performance.

The act of analyzing (or breaking into) secure documents or systems that are protected with encryption.

CSUs and DSUs are actually two separate devices, but they are used in conjunction and

used on a LAN into a digital signal used on a WAN and vice-versa (over a T-1 line, for example).