Siemens EF 711 Series Guia do Utilizador descarregar pdf (Página 479)

Glossary

SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 A-9

PDU Protocol Data Unit. A data object exchanged by protocol machines (such as management

stations, SMUX peers, and SNMP agents) and consisting of both protocol control

information and user data. PDU is sometimes used as a synonym for “packet''.

PEAP PEAP (Protected Extensible Authentication Protocol) is an IETF draft standard to

authenticate wireless LAN clients without requiring them to have certificates. In PEAP

authentication, first the user authenticates the authentication server, then the authentication

server authenticates the user. If the first phase is successful, the user is then authenticated

over the SSL tunnel created in phase one using EAP-Generic Token Card (EAP-GTC) or

Microsoft Challenged Handshake Protocol Version 2 (MSCHAP V2). (See also EAP-TLS).

PHP server Hypertext Preprocessor

PKI Public Key Infrastructure

PoE Power over Ethernet. The Power over Ethernet standard (802.3af) defines how power can

be provided to network devices over existing Ethernet connection, eliminating the need for

additional external power supplies.

POST Power On Self Test, a diagnostic testing sequence performed by a computer to determine if

its hardware elements are present and powered on. If so, the computer begins its boot

sequence.

push-to-talk (PTT) The push-to-talk (PTT) is feature on wireless telephones that allows them to operate like a

walkie-talkie in a group, instead of standard telephone operation. The PTT feature requires

that the network be configured to allow multicast traffic.

A PTT call is initiated by selecting a channel and pressing the ‘talk’ key on the wireless

telephone. All wireless telephones on the same network that are monitoring the channel will

hear the transmission. On a PTT call you hold the button to talk and release it to listen.

QoS Quality of Service. A term for a number of techniques that intelligently match the needs of

specific applications to the network resources available, using such technologies as Frame

Relay, Asynchronous Transfer Mode (ATM), Ethernet and 802.1 networks, SONET, and

IP-routed networks. QoS features provide better network service by supporting dedicated

bandwidth, improving loss characteristics, avoiding and managing network congestion,

shaping network traffic, setting traffic priorities across the network.

Quality-of-Service (QoS): A set of service requirements to be met by the network while

transporting a flow. (RFC2386)

RADIUS Remote Authentication Dial-In User Service. An authentication and accounting system that

checks User Name and Password and authorizes access to a network. The RADIUS

specification is maintained by a working group of the IETF (RFC2865 RADIUS, RFC2866

RADIUS Accounting, RFC2868 RADIUS Attributes for Tunnel Protocol Support).

RF Radio Frequency, a frequency in the electromagnetic spectrum associated with radio wave

propagation. When an RF current is supplied to an antenna, an electromagnetic field is

created that can propagate through space. These frequencies in the electromagnetic

spectrum range from Ultra-low frequency (ULF) -- 0-3 Hz to Extremely high frequency (EHF)

-- 30GHz - 300 GHz. The middle ranges are: Low frequency (LF) -- 30 kHz - 300 kHz,

Medium frequency (MF) -- 300 kHz - 3 MHz, High frequency (HF) -- 3MHz - 30 MHz, Very

high frequency (VHF) -- 30 MHz - 300 MHz, Ultra-high frequency (UHF)-- 300MHz - 3 GHz.

RFC Request for Comments, a series of notes about the Internet, submitted to the Internet

Engineering Task Force (IETF) and designated by an RFC number, that may evolve into an

Internet standard. The RFCs are catalogued and maintained on the IETF RFC website:

www.ietf.org/rfc.html.

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

1 2 ... 474 475 476 477 478 479 480 481 482 483 484 ... 491 492

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