ZyXEL Communications 1600 manual Glossary

	Prestige 1600 Universal Access Concentrator
	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.
ADSL	Asymmetric Digital Subscriber Line. A digital subscriber line (DSL) technology in which the
	transmission of data from server to client is much faster than the transmission from the client to
	the server.
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.
ATU-C and ATU-R	ADSL Transmission Unit, Central or Remote: the device at the end of an ADSL line that stands
	between the line and the first item of equipment in the subscriber premises or telephone switch.
	It may be integrated within an access node.
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).
bandwidth-on-demand	The ability of a user to dynamically set upstream and downstream line speeds to a particular
	rate of speed.
Bit	(Binary Digit) -- A single digit number in base-2, in other words, either a one or a zero. The
	smallest unit of computerized data.
bps	Bits per second. A standard measurement of digital transmission speeds.
Byte	A set of bits that represent a single character. There are 8 bits in a Byte.
Call Filtering	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.
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.
CI/CLI Commands	CI/CLI (Command Interface/Command Line Interface) commands can be accessed via Menu
	24.8. For details on CI commands to configure your Prestige, please consult the supporting CD.
	ZyXEL recommends use of the CI Commands only for debugging purposes.
CIR	See Committed Information Rate.
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.
Committed	The carrier programs virtual circuits into the network between your sites and charges you for a
Information Rate	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. The CIR
	limit for the Prestige is 8000Kbps. The sum of CIRs from all channels in a line cannot exceed
	8000Kbps due to the processing limit of the P1600 CPU.
CPE	Customer Premises Equipment: that portion of the ADSL system residing within the customer's
	premises.
crossover Ethernet	A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+. This cable
cable	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.
Data Filtering	Data filtering screens the data to determine if the packet should be allowed to pass. Data filters

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