Motorola SVG2500 User Manual page 144

This document is uncontrolled pending incorporation in PDM
17 GLOSSARY
TERM
Transparent
bridging
transport layer
trunk
TTL
tunnel
two-way
U-Z
TERM
UDP
unicast
upstream
USB
DEFINITION
A method to enable all hosts on the wired Ethernet LAN, WLAN,
and USB connection to communicate as if they were all
connected to the same physical network.
Layer of the OSI concerned with protocols for error recognition
and recovery. This layer also regulates information flow.
Electronic path over which data is transmitted.
The time to live is the number of routers (or hops) a packet can
traverse before being discarded. When a router processes a
packet, it decreases the TTL by 1. When the TTL reaches zero,
the packet is discarded.
To place packets inside other packets to send over a network.
The protocol of the enclosing packet is understood by each
endpoint, or tunnel interface, where the packet enters and
exits on the network. VPNs rely on tunneling to create a secure
network.
Tunneling requires the following protocol types:
•
A carrier protocol, such as TCP , used by the network that
the data travels over
•
An encapsulating protocol, such as IPSec, L2F , L2TP , or
PPTP , that is wrapped around the original data
•
A passenger protocol, such as IP , for the original data
A cable system that can transmit signals in both directions to
and from the headend and the subscriber.
DEFINITION
User Datagram Protocol
A point-to-point data transmission sent from one sender to one
receiver. This is the normal way you access websites. See also
broadcast and multicast
In a cable data network, upstream describes the direction of data
sent from the subscriber's computer through the cable modem
to the CMTS and the Internet.
Universal Serial Bus is a computer interface for add-on devices
such as printers, scanners, mice, modems, or keyboards. USB
supports data transfer rates of 12 Mbps and plug-and-play
installation. You can connect up to 127 devices to a single USB
port.
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