ZyXEL Communications Prestige 941 User Manual page 93

Prestige 941 Cable Router
Terminal Software: Software that pretends to be (emulates) a physical terminal and allows you to type
commands to a computer somewhere else.
Terminal: A device that allows you to send commands to a computer somewhere else. At a minimum, this
usually means a keyboard and a display screen and some simple circuitry.
TFTP: Trivial File Transfer Protocol is an Internet file transfer protocol similar to FTP (File Transfer
Protocol), but is scaled back in functionality so that it requires fewer resources to run. TFTP uses the UDP
(User Datagram Protocol) rather than TCP (Transmission Control Protocol).
Three-way Cable Modem: A three-way cable modem is a hybrid that can uses either a telephone modem
or the TV cable for the upstream traffic.
Two-way Cable Modem: A two-way Cable Modem uses the TV cable for both downstream and upstream
traffic.
UDP: UDP is a connectionless transport service that dispenses with the reliability services provided by TCP.
UDP gives applications a direct interface with IP and the ability to address a particular application process
running on a host via a port number without setting up a connection session.
Upstream Frequency: The frequency used to transmit data from the CM to the CMTS. Normally in the 5
to 42 MHz range for US systems and 5 to 65 MHz range for European systems.
Upstream: The data flowing from the CM to the CMTS.
UTP: Unshielded Twisted Pair (cable).
WAN: Wide Area Networks link geographically dispersed offices in other cities or around the globe. Just
about any long-distance communication medium can serve as a WAN link, including switched and
permanent telephone circuits, terrestrial radio systems and satellite systems.
ZyNOS: ZyXEL Network Operating System.
Glossary G