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PPENDIX C: GLOSSARY
Internet Group
Management
Protocol (IGMP)
A network-layer protocol for managing multicast groups on the Internet.
IGMP establishes and maintains a database of group multicast addresses and
the interfaces to which a multicast router must forward the multicast data
packets.
Internet Protocol
(IP)
The method or protocol by which data is sent from one computer to another
on the Internet. Each computer (known as a host) on the Internet has at least
one IP address that uniquely identifies it from all other computers on the
Internet. An IP address includes a network address and a host address. An IP
address can also be divided by using classless addressing or subnetting.
Interval Usage
Code
A field in MAPs and UCDs to link burst profiles to grants.
IP See Internet Protocol.
IP Filtering IP filtering enables you to filter upstream packets that pass through the
CMTS. IP filtering can prevent subscribers from accessing head-end servers,
enforce subscribers to log on to the cable network, enforce separately-billed
service packages for data, and provide group access control for IP Multicast.
IP Multicast IP Multicast reduces traffic on a network by delivering a single stream of
information to multiple users at one time.
IP Network A group of IP routers that route IP datagrams. These routers are sometimes
referred to as Internet gateways. Users access the IP network from a host.
Each network in the Internet includes some combination of hosts and IP
routers.
IRC See Incremental Related Carriers.
ISO See International Organization for Standardization.
ITU-T See International Telecommunications Union.
Java A high level programming language developed by Sun Microsystems.
LAN See Local Area Network.
Latency The time delay, expressed in quantity of symbols, taken for a signal element
to pass through a device.