ZyXEL Communications Prestige 642 User Manual
Prestige 642 PPPoE Modem
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Glossary
Glossary
100Base-T
Uses two pairs of twisted-pair wire with a maximum distance of 100 meters between
the hub and the workstation.
the hub and the workstation.
10Base-T
The 10-Mbps baseband Ethernet specification that uses two pairs of twisted-pair
cabling (Category 3 or 5), one pair for transmitting data and the other for receiving
data.
cabling (Category 3 or 5), one pair for transmitting data and the other for receiving
data.
ADSL
Asymmetrical Digital Subscriber Line is an asymmetrical technology which means that
the downstream data rate of the line is much higher than the upstream data rate. ADSL
operates in a frequency range that is above the frequency range of voice services, so the
two systems can operate over the same cable.
the downstream data rate of the line is much higher than the upstream data rate. ADSL
operates in a frequency range that is above the frequency range of voice services, so the
two systems can operate over the same cable.
Analog
An electrical circuit that is represented by means of continuous, variable physical
quantities (such as voltages and frequencies), as opposed to discrete representations
(like the 0/1, off/on representation of digital circuits).
quantities (such as voltages and frequencies), as opposed to discrete representations
(like the 0/1, off/on representation of digital circuits).
ARP
Address Resolution Protocol is a protocol for mapping an Internet Protocol address (IP
address) to a physical computer address that is recognized in the local network.
address) to a physical computer address that is recognized in the local network.
Bandwidth
This is the capacity on a link usually measured in bits-per-second (bps).
Bit
A Binary Digit (either a one or a zero); a single digit number in base-2. A bit is the
smallest unit of computerized data.
smallest unit of computerized data.
Byte
A set of bits that represent a single character. There are eight bits in a byte.
Camping Out
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.
with a physical location, electronic reference or an entry point for future attacks.
CHAP
Challenge Handshake Authentication Protocol is an alternative protocol that avoids
sending passwords over the wire by using a challenge/response technique.
sending passwords over the wire by using a challenge/response technique.
Client
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.
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.
CO
Central Office. 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.
subscribers' lines are joined to switching equipment that allows them to connect to each
other for both local and long distance calls.
COE
Central Office Equipment. COE is where home and office phone lines terminate and
connect to a much larger switching system.
connect to a much larger switching system.
Command Line
A command line interface is a computer environment in which you enter predefined
commands on the command line to modify, configure and display information about a
commands on the command line to modify, configure and display information about a