ZyXEL Communications Prestige 941 User Manual page 88

Prestige 941 Cable Router
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.
CMTS: Cable Modem Termination System. A central device for connecting the cable TV network to a data
network like the Internet. Normally it is placed in the headend of the cable TV system.
CPE: Customer Premises Equipment. Used to describe the computer and/or other equipment that the
customer may want to connect to the cable modem.
Crossover 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.
DCE: Data Communications Equipment is typically a modem or other type of communication device. The
DCE sits between the DTE (data terminal equipment) and a transmission circuit such as a phone line.
DES: Data Encryption Standard.
DHCP: Dynamic Host Configuration Protocol. This protocol provides a mechanism for allocating IP
addresses dynamically so that addresses can be reused. Often used for managing the IP addresses of all the
cable modems in a cable plant and the computers connected to the cable modems.
DNS: Domain Name System links names to IP addresses. When you access web sites on the Internet, you
can type the IP address of the site or the DNS name. When you type a domain name in a Web browser, a
query is sent to the primary DNS server defined in your web browser's configuration dialog box. The DNS
server converts the name you specified to an IP address and returns this address to your system. From then on,
the IP address is used in all subsequent communications.
DOCSIS: Data over Cable Service Interface Specification. It is the dominating cable modem standard, which
defines technical specifications for both cable modem and CMTS.
Domain Name: The unique name that identifies an Internet site. Domain Names always have 2 or more
parts, separated by dots. The part on the left is the most specific, and the part on the right is the most general.
Downstream Frequency: The frequency used for transmitting data from the CMTS to the cable modem.
Normally in the 42/65-850 MHz range depending on the actual cable plant capabilities.
Downstream: The data flowing from the CMTS to the cable modem.
DRAM: Dynamic RAM that stores information in capacitors that must be refreshed periodically.
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Glossary