Motorola Netopia 7000, Administrator'S Handbook

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the same levels of Quality of Ser vice, authentication, and ser vice segmentation previously provided by tra-
ditional DSL networks.
twisted pair.
Cable consisting of two copper strands twisted around each other. The twisting provides pro-
tection against electromagnetic inter ference.
-----U-----
UTP.
Unshielded twisted pair cable.
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VDSL.
Ver y high rate Digital Subscriber Line. VDSL transmits high speed data over shor t reaches of
twisted-pair copper telephone lines, with a range of speeds depending upon actual line length. Both data
channels will be separated in frequency from bands used for POTS and ISDN, enabling ser vice providers to
overlay VDSL on existing ser vices. At present the two high speed channels will also be separated in fre-
quency.
VLAN.
Vir tual Local Area Network. A network of computers that behave as if they are connected to the
same wire even though they may be physically located on different segments of a LAN. VLANs are config-
ured in software rather than hardware.
VoIP.
V oice- o ver- IP (VoIP) refers to the ability to make voice telephone calls over the Internet. This differs
from traditional phone calls that use the Public Switched Telephone Network (PSTN). VoIP calls use an Inter-
net protocol, Session Initiation Protocol (SIP), to transmit sound over a network or the Internet in the form
of data packets.
-----W-----
WAN.
Wide Area Network. Private network facilities, usually offered by public telephone companies but
increasingly available from alternative access providers (sometimes called Competitive Access Providers,
or CAPs), that link business network nodes.
WFQ.
W eighted F air Q ueueing. A packet scheduling technique allowing guaranteed bandwidth ser vices in
order to let multiple sessions share the same link. It regulates the flow of data in networks by sor ting pack-
ets to minimize latency. WFQ passes along narrowband signals first, and buffers broadband signals.
WMM.
W iFi M ulti M edia. WiFi Multimedia allows you to prioritize various types of data travelling over the
wireless network. Cer tain types of data that are sensitive to delays, such as voice or video, must be priori-
tized ahead of other, less delay-sensitive types, such as email. It currently implements wireless Quality of
Ser vice (QoS) by transmitting data depending on Diffser v priority settings.
WWW.
World Wide Web.
-----X-----
XAuth.
Extended Authentication. An extension to the Internet Key Exchange (IKE) protocol, for IPSec tunnel-
ling. Requires SafeHarbour IPsec tunneling feature key.