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Overview Installation Troubleshooting Contact
ICSA
The International Computer Security Association is the security industry's main source of research,
intelligence, and product certification.
IEEE
The Institute of Electrical and Electronics Engineers, Inc. (http://www.ieee.org) is an organization that
produces standards, technical papers, and symposiums for the electrical and electronic industries and
is accredited by ANSI.
IEEE 802.11b
IEEE wireless network standards.
IEEE 802.11g
IEEE 802.3
See Ethernet.
IETF
The Internet Engineering Task Force (http://www.ietf.org) is an open international community of
network designers, operators, vendors, and researchers to develop and maintain Internet architecture.
Technical working groups issue working documents called Internet-Drafts. The IETF publishes review
versions of the drafts called requests for comments (RFCs).
IGMP
Internet Group Membership Protocol — the Internet multicasting standard. IGMP establishes and
maintains a database of group multicast addresses and interfaces to which a multicast router forwards
multicast packets. IGMP runs between multicast hosts and their immediately-neighboring multicast
routers.
IGMP spoofing
A process where a router acts as an IGMP querier for multicast hosts and an IGMP host to a multicast
router.
impedance
The total opposition to AC electron current flow within a device. Impedance is typically 75 ohms for
coax cable and other CATV components.
impulse noise
Noise of very short duration, typically of the order of 10 microseconds. It is caused by electrical
transients such as voltage spikes, electric motors turning on, and lightning or switching equipment that
bleed over to the cable.
ingress noise
Noise typically caused by discrete frequencies picked up by the cable plant from radio broadcasts or
an improperly grounded or shielded home appliance such as a hair dryer. Ingress is the major source
of cable system noise.
Internet
A worldwide collection of interconnected networks using TCP/IP.
Internetwork
A collection of interconnected networks allowing communication between all devices connected to any
network in the collection.
IP
Internet Protocol is a set of standards that enable different types of computers to communicate with
one another and exchange data through the Internet. IP provides the appearance of a single,
seamless communication system and makes the Internet a virtual network.
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IP address
A unique 32-bit value that identifies each host on a TCP/IP network. TCP/IP networks route messages
based on the destination IP address. An IP address has two parts:
•
The network address is assigned by IANA.
•
The VT2500 network administrator assigns a host address to each host connected to the VT2500,
automatically using its DHCP server as a static IP address.
For a Class C network, the first 24 bits are the network address and the final 8 bits are the host
address; in dotted-decimal format, it appears "network.network.network.host."
If you enable the VT2500 DHCP client on the WAN page, the cable provider automatically assigns the
network address, subnet mask, domain name, and DNS server to provide a continuous Internet
connection.
IPSec
The Internet Protocol Security protocols are IETF authentication and encryption standards for secure
packet exchange over the Internet. IPSec works at OSI layer 3 and secures everything on the
network.
VT2400/VT2500 Series Voice Gateway User Guide
Configuration: Basic
Advanced
FAQ Specifications Glossary License
TCP/IP
Wireless
button.
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