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86 SmartVoice Gateway(s) User Guide
YML832 Rev2
hop When you send data through the Internet, it is sent first from your computer to a
router, and then from one router to another until it finally reaches a router that is
directly connected to the recipient. Each individual “leg” of the data’s journey is
called a hop.
hop count The number of hops that data has taken on its route to its destination. Alterna-
tively, the maximum number of hops that a packet is allowed to take before being
discarded , See also TTL.
host A device (usually a computer) connected to a network.
HTTP Hyper-Text Transfer Protocol HTTP is the main protocol used to transfer data from
web sites so that it can be displayed by web browsers. See also web browser
ICMP Internet Control Message Protocol An Internet protocol used to report errors and
other network-related information. The ping command makes use of ICMP.
IGMP Internet Group Management Protocol An Internet protocol that enables a computer
to share information about its membership in multicast groups with adjacent
routers. A multicast group of computers is one whose members have designated
as interested in receiving specific content from the others. Multicasting to an IGMP
group can be used to simultaneously update the address books of a group of
mobile computer users or to send company newsletters to a distribution list.
in-line filter See Microfilter
Internet The global collection of interconnected networks used for both private and busi-
ness communications.
intranet A private, company-internal network that looks like part of the Internet (users ac-
cess information using web browsers), but is accessible only by employees.
IP See TCP/IP.
IP address Internet Protocol address The address of a host (computer) on the Internet,
consisting of four numbers, each from 0 to 255, separated by periods, e.g.,
209.191.4.240. An IP address consists of a network ID that identifies the particular
network the host belongs to, and a host ID uniquely identifying the host itself on
that network. A network mask is used to define the network ID and the host ID.
Because IP addresses are difficult to remember, they usually have an associated
domain name that can be specified instead. See also domain name, network mask.
ISP Internet Service Provider A company that provides Internet access to its customers,
usually for a fee.
LAN Local Area Network A network limited to a small geographic area, such as a home,
office, or small building.
LED Light Emitting Diode An electronic light-emitting device. The indicator lights on the
front of the My ADSL Modem are LEDs.
MAC address Media Access Control address The permanent hardware address of a device,
assigned by its manufacturer. MAC addresses are expressed as six pairs of char-
acters.
mask See network mask.
Mbps Abbreviation for Megabits per second, or one million bits per second. Network data
rates are often expressed in Mbps.