Gateway The device, usually a router, that connects devices on a given IP subnet
to other IP subnets.
Headend The "central oce" in an HFC network. The headend houses both video
and data equipment. In larger cable networks, a "master" headend oen
feeds several "remote" headends to provide distributed services.
HTTP HyperText Transfer Protocol.
Hub A box with several Ethernet connectors. Ethernet hubs provide a
common point of contact for all connected devices.
IP address A number assigned to your computer by your service provider, used to
idenfy your computer to other systems on the Internet.
ISDN Integrated Services Digital Network. A digital telephony standard that
provides communicaon speeds about twice as fast as standard dialup.
LAN Local Area Network. A network that allows computers in a single locaon
(such as a building) to communicate with one another.
LED Light Eming Diode. A semi-conductor diode that emits light when
current is passed through it.
MAC address A number that uniquely idenes any device connected to a network.
Your service provider uses your Telephony Gateway's MAC address to
authorize access to the Internet. The MAC address is printed on a label
axed to your Telephony Gateway.
Protocol A set of rules and formats that determines the communicaon behavior
of network enes at a given layer.
Proxy A device or program that stands in between a server (for example, a web
site) and a client (your browser), providing a way to relieve some of the
burden from the server. For example, your service provider may have a
web proxy that keeps copies of popular web pages; the proxy can send
you those pages instead of fetching them directly from the web site,
resulng in faster page loading and less network congeson.
RF Abbreviaon for Radio Frequency. Some literature refers to coax as "RF
cable" and the connectors as "RF connectors."
RJ-11 A standard 2-conductor modular connector, commonly used in North
America for connecng telephones.
RJ-45 A standard 8-conductor modular connector, commonly used on Ethernet
cable. An RJ-45 connector looks like a wide RJ-11 (telephone) connector.
Splier A small box with three cable connectors: one input and two outputs. You
may need a splier if you have a TV already connected to the cable
outlet that you want to use for your Telephony Gateway. You can buy a
splier from any electronics retailer and most discount stores.
SSID Service Set IDener. A string of text (up to 32 characters long) that
uniquely idenes a wireless LAN.
Appendix A: Glossary
Touchstone TG6452 Telephony Gateway User Guide DRAFT Revision 2.3 38
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