Motorola SBV5121 manual Glossary

Introduction Installation Troubleshooting

Glossary

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Glossary

coaxial cable	A type of wire consisting of a center wire surrounded by insulation and a grounded shield of
(coax)	braided wire. The shield minimizes electrical and radio frequency interference.
DOCSIS	The CableLabs Data-Over-Cable Service Interface Specification defines interface standards for
	VoIP cable modems and supporting equipment.
download	To copy a file from one computer to another. You can use the Internet to download files from a
	server to your home PC. A DOCSIS VoIP cable modem downloads its configuration from a server
	during start-up.
downstream	In a network, downstream describes the direction of data received by your computer from the
	Internet.
Ethernet	The most widely used type of local area network (LAN). The most commonly installed Ethernet
	networks are called 10Base-T. 10Base-T provides transmission speeds up to 10 megabits per
	second (Mbps), usually over twisted-pair wire. Fast Ethernet (100Base-T) provides transmission
	speeds up to 100 Mbps.

expansion slot An opening in a computer where a circuit board can be inserted to add new capabilities. F-type connector A connector used to connect coaxial cable to equipment.

IP address An Internet Protocol address is an identifier for a computer or device on a TCP/IP network. Networks using the TCP/IP protocol route messages based on the destination IP address. Your cable provider assigns your VoIP cable modem an IP address to provide a continuous Internet connection.

MAC address	The Media Access Control Address uniquely identifies each device that can be connected to an
	Ethernet network. It is permanently written to read-only memory (ROM) at the factory and printed
	on the rear panel of your VoIP cable modem. You need to provide the MAC address to your cable
	provider.
MHz	Mega Hertz. A measure of radio frequency - millions of cycles per second. One MHz means one
	million cycles per second.
PBX	A private branch exchange is a private telephone network usually used within a business. Users of
	the PBX share a certain number of outside lines for making telephone calls external to the PBX.
PSTN	The public switched telephone network is the traditional circuit-switched, voice-oriented telephone
	network originally invented by Alexander Graham Bell. It is sometimes referred to as plain old
	telephone service (POTS).
RJ-11	The most common type of connector for household phones.
RJ-45	The most common type of connector for Ethernet networks.
splitter	A splitter is a device that divides the signal power from an input cable equally between two or more
	signals, each carrying a selected frequency range.
TCP/IP	Transmission Control Protocol/Internet Protocol is a set of protocols that provides standards and
	rules for communication between networks.
upstream	In a network, upstream describes the direction of data sent from your computer to the Internet.
UPS	An uninterruptible power supply provides a battery backup to enable voice service to continue for
	some time during a power outage.

SBV5121 VoIP Cable Modem User Guide 47