Chapter 7: Glossary
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).
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
modem.
Firewall A hardware or software device that prevents
unauthorized access to a private network from
the Internet. Your telephony modem provides a
built-in firewall.
Gateway The device, usually a router, that connects
devices on a given IP subnet to other IP subnets.
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
service provider, 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.
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 service provider
SURFboard
®
SBV3202 DOCSIS 3.0 telephony modem for Xfinity
®
customers User Guide STANDARD Revision x.3 44
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