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Glossary
A
Amp-Hour
A measure of battery capacity. For
example, a 1.0Ah battery can nominally
supply one Ampere of current for one
hour.
C
Category 5e (Cat5e)
A high-quality type of cable, used for
gigabit Ethernet (1000BaseT)
connections. 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).
D
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 device
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.
DOCSIS
Data Over Cable System Interface
Specification. The interoperability
standards used for data communications
equipment on an HFC network.
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.
E
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
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 private
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network from the Internet. The TG2472
provides a built-in firewall.
G
Gateway
The device, usually a router, that
connects devices on a given IP subnet to
other IP subnets.
H
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.
I
IP address
A number assigned to your computer by
your cable company, used to identify your
computer to other systems on the
Internet.
ISDN
Integrated Services Digital Network. A
digital telephony standard that provides
communication speeds about twice as
fast as standard dialup.
L
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.
M
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.
P
Protocol
A set of rules and formats that
determines the communication behavior
of network entities 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 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.
R
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
America for connecting telephones.
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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.
S
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.
T
TCP/IP
Transmission Control Protocol/Internet
Protocol. The protocols used to facilitate
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.
U
Upstream
The path from a subscriber device to the
headend. Some older cable
documentation may refer to this as the
return path or reverse path.
W
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.
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January 2015
Touchstone TG2472 Telephony Gateway User Guide
43
Page 44 / 44
Touchstone TG2472
Telephony Gateway
User Guide
Corporate Headquarters
ARRIS
·
Suwanee
·
Georgia
·
30024
·
USA
T:
1-678-473-2000
F:
1-678-473-8470
www.arris.com

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