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DOCSIS
DOCSIS (Data Over Cable Service Interface
Specification) defines the interface requirements for cable
modems providing data distribution over a cable
television network. DOCSIS ensures that a network will
work properly when DOCSIS modems made by different
vendors are connected to it.
Download
The passing of data from the Headend to the computer.
Downstream
The direction of a downstream signal is from the headend
to the user's computer.
Drop Cable
Drop cables connect the feeder cables to customers'
homes.
Duplex Tuner
A tuner that processes both upstream and downstream
signals.
Encryption
The scrambling of a signal by means of an algorithm, to
prevent unauthorized monitoring of the message.
Ethernet
A network technology that uses a bus topology in which
all computers on the Ethernet attach to a single cable.
Ethernet Card
A plug-in circuit board installed in an expansion slot of
the computer. The Ethernet card (also called a Network
Interface Card, or NIC) takes parallel data from the
computer, converts it to serial data, packets it, and sends
it out over a 10BaseT cable.
Euro-DOCSIS
Euro-DOCSIS (European Data Over Cable Service
Interface Specification) defines the interface
requirements for cable modems providing data
distribution over a cable television network. Euro-DOCSIS
ensures that a network will work properly when
Euro-DOCSIS modems made by different vendors are
connected to it.
Feeder Cable
The feeder cables are branches off the main trunk cable.
Feeder cables lead out into different geographic areas
serviced by the provider.
Headend
The equipment located in the central office of the service
provider. The headend connects the cable network to
external data networks.
HFC
See Hybrid Fiber/Coax
Hybrid
A cable system where the cables closest to the Headend
Fibre/Coax
are fibre technology, and the cables dropped into
individual homes are coaxial. Between these two ends,
the signal is converted from fibre to coaxial.
Hub
A device used to connect multiple computers to the cable
modem, using Ethernet technology.
Initialization
The steps a device goes through prior to beginning
normal operations.
Internet
A global collection of interconnected networks used for
worldwide computer-based communications.
Internet Protocol
Internet Protocol (IP) is a standard that defines the
format of packets of information sent over the Internet
and the mechanism for routing each packet to its
destination. IP is the network portion of TCP/IP.
Internet Service
An Internet Service Provider (ISP) is a commercial
Provider
organization that provides access to the Internet for its
subscribers.
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