ZyXEL Communications Prestige 724, Руководство пользователя

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Prestige 724 G.SHDSL CSU/DSU
Glossary G
Glossary
100Base-T Uses two pairs of twisted-pair wire with a maximum distance of 100 meters between
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.
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.
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).
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.
ATM
Asynchronous Transfer Mode. ATM is a LAN and WAN networking technology that
provides high-speed data transfer. ATM uses fixed sized packets of information called
cells. With ATM, a high QoS (Quality of Service) can be guaranteed.
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
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.
Bridging Bridging provides LAN to LAN frame forwarding services between two or more
LANs. Frames from one LAN are forwarded across a bridge to a connected LAN,
although filtering can be employed to selectively forward frames. Bridging works
similar to the way repeaters work except that bridges forward frames based on their
MAC (Medium Access Control) addresses which are hardware-level addresses of
NICs (Network Interface Cards).
Byte
A set of bits that represent a single character. There are eight bits in a byte.
CHAP Challenge Handshake Authentication Protocol is an alternative protocol that avoids
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