ZyXEL Communications P630M User Manual
Prestige 630 ADSL USB Modem
Glossary
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Glossary
10BaseT
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.
(Category 3 or 5): one pair for transmitting data and the other for receiving data.
ADSL
Asymmetrical Digital Subscriber Line is an asymmetrical technology, meaning that the
downstream data rate 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.
downstream data rate 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.
ARP
Address Resolution Protocol is a protocol for mapping an Internet Protocol address (IP
address) to a physical machine address that is recognized in the local network.
address) to a physical machine address that is recognized in the local network.
Backbone
A high-speed line or series of connections that forms a major pathway within a network.
Bandwidth
This is the capacity on a link usually measured in bits-per-second (bps).
Bit
(Binary Digit) -- A single digit number in base-2, in other words, either a 1 or a zero. The
smallest unit of computerized data.
smallest unit of computerized data.
Byte
A set of bits that represent a single character. There are 8 bits in a Byte.
CDR
Call Detail Record. This is a name used by telephone companies for call related information.
CHAP
Challenge Handshake Authentication Protocol is an alternative protocol that avoids sending
passwords over the wire by using a challenge/response technique.
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 is a
specific kind of Client.
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 is a
specific kind of Client.
Crossover
Ethernet
Cable
Ethernet
Cable
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.
connects two similar devices, for example, two data terminal equipment (DTE) or data
communications equipment (DCE) devices.
CSU/DSU
Channel Service Unit/Data Service Unit. CSUs (channel service units) and DSUs (data service
units) are actually two separate devices, but they are used in conjunction and often combined
into the same box. The devices are part of the hardware you need to connect computer
equipment to digital transmission lines). The Channel Service Unit device connects with the
digital communication line and provides a termination for the digital signal. The Data Service
Unit device, sometimes called a digital service unit, is the hardware component you need to
transmit digital data over the hardware channel. The device converts signals from bridges,
routers, and multiplexors into the bipolar digital signals used by the digital lines. Multiplexors
mix voice signals and data on the same line.
units) are actually two separate devices, but they are used in conjunction and often combined
into the same box. The devices are part of the hardware you need to connect computer
equipment to digital transmission lines). The Channel Service Unit device connects with the
digital communication line and provides a termination for the digital signal. The Data Service
Unit device, sometimes called a digital service unit, is the hardware component you need to
transmit digital data over the hardware channel. The device converts signals from bridges,
routers, and multiplexors into the bipolar digital signals used by the digital lines. Multiplexors
mix voice signals and data on the same line.
DCE
Data Communications Equipment is typically a modem or other type of communication device.