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Glossary
The following is a list of common cable and networking terms.
Amp-hour (Ah)
A measure of battery capacity. For example, a 1.0Ah battery can nominally
supply one Ampere of current for one hour.
Category 5e (Cat5e)
A high-quality type of cable, used for gigabit Ethernet (1000BaseT) connec-
tions. When purchasing Ethernet cables, always look for Category 5e cable.
Coaxial cable (coax)
A thin wire, used to connect your television and Telephony Gateway to the
cable TV system. You can buy coax from any electronics retailer and many
discount stores.
CPE
Customer Premise Equipment. This is the equipment that is plugged in to the
Telephony Gateway; typically a computer or hub.
Cross-over
An Ethernet cable used to connect two hubs (or a hub and a cable modem)
together. Also, some Ethernet hubs may have built-in cross-over on one or
more ports (which eliminates the need for a cross-over cable).
DHCP
Dynamic Host Configuration Protocol. An IP protocol used to provide an IP
address and location of services (such as DNS and TFTP) needed by a de-
vice connecting to the network. DHCP allows the cable company to configure
your computer’s networking software for you.
DNS
Domain Name Service (Server). An IP service that associates a domain
name (such as www.example.com) with an IP address.
Touchstone TG862 Telephony Gateway User’s Guide
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Getting
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Battery
Installation
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Ethernet
Configuration
Usage
Troubleshooting
Glossary
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Downstream
In an HFC network, the direction from the head-end to the subscriber. Some
older cable documentation may refer to this as the forward path.
DOCSIS
Data Over Cable System Interface Specification. The interoperability stan-
dards used for data communications equipment on an HFC network.
EMTA
Embedded Multimedia Terminal Adapter. An MTA device that is integrated
with a cable modem.
Ethernet
A standard method of connecting two or more computers into a Local Area
Network (LAN).
EuroDOCSIS
The European version of DOCSIS.
Event
An informational message used for monitoring network status.
F-connector
The type of connector used on coax cable. There are two common types of
F-connector, slip-on and screw-on. Use coax with screw-on connectors for
connecting your Telephony Gateway.
Firewall
A hardware or software device that prevents unauthorized access to a pri-
vate network from the Internet. The TG862 provides a built-in firewall.
Gateway
The device, usually a router, that connects devices on a given IP subnet to
other IP subnets.
Touchstone TG862 Telephony Gateway User’s Guide
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Ethernet
Configuration
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Glossary
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Headend
The “central office” in an HFC network. The headend houses both video and
data equipment. In larger cable networks, a “master” headend often 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 cable company, used to iden-
tify your computer to other systems on the Internet.
ISDN
Integrated Services Digital Network. A digital telephony standard that pro-
vides communication speeds about twice as fast as standard dialup.
LAN
Local Area Network. A network that allows computers in a single location
(such as a building) to communicate with one another.
LED
Light Emitting Diode. A semi-conductor diode that emits light when current
is passed through it.
MAC address
A number that uniquely identifies any device connected to a network. Your
cable company uses your Telephony Gateway’s MAC address to authorize
access to the Internet. The MAC address is printed on a label on the bottom
of your Telephony Gateway.
Protocol
A set of rules and formats that determines the communication behavior of
network entities at a given layer.
Touchstone TG862 Telephony Gateway User’s Guide
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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 cable company 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, resulting in faster
page loading and less network congestion.
RF
Abbreviation 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 Amer-
ica for connecting telephones.
RJ-14
A standard 4-conductor modular connector, commonly used in North Amer-
ica for connecting 2-line 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.
Splitter
A small box with three cable connectors: one input and two outputs. You
may need a splitter if you have a TV already connected to the cable outlet
that you want to use for your Telephony Gateway. You can buy a splitter
from any electronics retailer and most discount stores.
SSID
Service Set IDentifier, a string of text (up to 32 characters long) that
uniquely identifies a wireless LAN.
Switched outlet
A power outlet that may be turned on and off using a wall switch. Usually
intended for lamps. Avoid plugging your computer or Telephony Gateway
into a switched outlet to avoid disruptions.
Touchstone TG862 Telephony Gateway User’s Guide
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Getting
Started
Battery
Installation
Installation
Ethernet
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Glossary
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TCP/IP
Transmission Control Protocol/Internet Protocol. The protocols used to facil-
itate communications across one or more connected networks.
TDMA
Time Division Multiple Access. A method used by DOCSIS-compliant cable
modems for sending upstream data with minimal interference.
Upstream
The path from a subscriber device to the headend. Some older cable docu-
mentation may refer to this as the return path or reverse path.
WEP
Wired Equivalent Privacy, a common standard for encrypting data sent over
a wireless LAN.
WPA
Wi-fi Protected Access, a standard for encrypting data sent over a wireless
LAN. WPA offers improved security over WEP.
Touchstone TG862 Telephony Gateway User’s Guide
Safety
Getting
Started
Battery
Installation
Installation
Wireless
Configuration
Ethernet
Configuration
Usage
Troubleshooting
Glossary
55

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