Motorola SURFboard SBG901, Руководство пользователя

Страница: 118 / 130

B Glossary 118
This document is uncontrolled pending incorporation in PDM
TERM DEFINITION
path between open systems. The network layer knows the address of
the neighboring nodes, packages output with the correct network
address data, selects routes, and recognizes and forwards to the
transport layer incoming messages for local host domains.
NIC A network interface card converts computer data to serial data in a
packet format that it sends over the LAN. A NIC is installed in an
expansion slot or can be built-in. Every Ethernet NIC has a MAC
address permanently saved in its ROM.
node On a LAN, a generic term for any network device.
On an HFC network, the interface between the fiber-optic trunk and
coaxial cable feeders to subscriber locations. A node is typically located
in the subscriber’s neighborhood.
noise Random spurts of electrical energy or interface. May produce a salt-
and-pepper pattern on a television picture.
O
ohm A unit of electrical resistance.
OSI The Open Systems Interconnection reference model is an illustrative
model describing how data moves through a network from an
application on the source host to an application on the destination host.
It is a conceptual framework developed by ISO that is now the primary
model for intercomputer communications. OSI is a model only; it does
not define a specific networking interface.
P
packet The unit of data that is routed between the sender and destination on
the Internet or other packet-switched network. When data, such as an
e-mail message, is sent over the Internet, the sender’s IP divides the
data into uniquely-numbered packets. The packet header contains the
source and destination IP addresses. The individual packets may travel
different routes. When all packets arrive at the destination, IP at that
end reassembles the packets.
packet-switched A scheme to handle transmissions on a connectionless network such
as the Internet. An alternative is circuit-switched.
PacketCable A CableLabs-led project to define a common platform to deliver
advanced, real-time multimedia services over two-way HFC cable plant.
Built on DOCSIS 1.1, PacketCable networks use IP technology as the