Cisco DNCS System Release 2.8.1 3.8.1 4.3.1 Design Guide
4000358 Rev B
Introducing DOCSIS
1-3
Terminology
List of Terms
The following terms are used in the discussions throughout this guide. Please
become familiar with these terms to help you better understand the concepts
presented.
Term
Definition
Address Resolution
Protocol (ARP)
used to convert an IP address into a physical
address, such as an Ethernet address. A host that
needs to obtain a physical address can broadcast an
ARP request onto the TCP/IP network. The host on
the network that has the IP address in the request
then replies with its physical hardware address.
A/V services
Analog or digital audio and video services.
Broadcast-only mode
A state in which a DHCT has not established an
interactive communications path and only receives
broadcast and conditional access (CA) data.
Advanced services, such as digital broadcast,
Interactive Program Guide (IPG), and Pay-Per-View
(PPV), are available to the DHCT in this mode, but
Impulse PPV (IPPV) polling and interactive data
services do not function in broadcast–only mode.
Cable Modem Termination
System (CMTS)
The Cable Modem Termination System is a piece of
equipment in the headend that allows cable
television operators to offer high-speed Internet
access to home computers.
The CMTS sends and receives digital cable modem
The CMTS sends and receives digital cable modem
signals on a cable network. The CMTS receives
signals sent upstream from a user's cable modem,
converts the signals into IP packets, and routes the
signals to an Internet service provider for connection
to the Internet. The CMTS also can send signals
downstream to the user's cable modem. Cable
modems cannot communicate directly with each
other; they must communicate by channeling their
signals through the CMTS.