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Glossary

SCALANCE WLC711

A-10 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

Roaming In 802.11, roaming occurs when a wireless device (a station) moves from one Access Point

to another (or BSS to another) in the same Extended Service Set (ESS) -identified by its

SSID.

RP-SMA Reverse Polarity-Subminiature version A, a type of connector used with wireless antennas

RSN Robust Security Network. A new standard within IEEE 802.11 to provide security and privacy

mechanisms. The RSN (and related TSN) both specify IEEE 802.1x authentication with

Extensible Authentication Protocol (EAP).

RSSI RSSI received signal strength indication (in 802.11 standard)

RTS / CTS RTS request to send, CTS clear to send (in 802.11 standard)

Segment In Ethernet networks, a section of a network that is bounded by bridges, routers or switches.

Dividing a LAN segment into multiple smaller segments is one of the most common ways of

increasing available bandwidth on the LAN.

SLP Service Location Protocol. A method of organizing and locating the resources (such as

printers, disk drives, databases, e-mail directories, and schedulers) in a network. Using SLP,

networking applications can discover the existence, location and configuration of networked

devices.

With Service Location Protocol, client applications are 'User Agents' and services are

advertised by 'Service Agents'. The User Agent issues a multicast 'Service Request'

(SrvRqst) on behalf of the client application, specifying the services required. The User

Agent will receive a Service Reply (SrvRply) specifying the location of all services in the

network which satisfy the request.

For larger networks, a third entity, called a 'Directory Agent', receives registrations from all

available Service Agents. A User Agent sends a unicast request for services to a Directory

Agent (if there is one) rather than to a Service Agent.

(SLP version 2, RFC2608, updating RFC2165)

SMI Structure of Management Information. A hierarchical tree structure for information that

underlies Management Information Bases (MIBs), and is used by the SNMP protocol.

Defined in RFC1155 and RFC1442 (SNMPv2).

SMT (802.11) Station ManagemenT. The object class in the 802.11 MIB that provides the necessary

support at the station to manage the processes in the station such that the station may work

cooperatively as a part of an IEEE 802.11 network. The four branches of the 802.11 MIB are:

• dot11smt - objects related to station management and local configuration

• dot11mac - objects that report/configure on the status of various MAC parameters

• dot11res - Objects that describe available resources

• dot11phy - Objects that report on various physical items.

SNMP Simple Network Management Protocol. A set of protocols for managing complex networks.

SNMP works by sending messages, called protocol data units (PDUs), to different parts of a

network. SNMP-compliant devices, called agents, store data about themselves in

Management Information Bases (MIBs) and return this data to the SNMP requesters.

SNMP includes a limited set of management commands and responses. The management

system issues Get, GetNext and Set messages to retrieve single or multiple object variables

or to establish the value of a single variable. The managed agent sends a Response

message to complete the Get, GetNext or Set.

SNMP trap An event notification sent by the SNMP managed agent to the management system to

identify the occurrence of conditions (such as a threshold that exceeds a predetermined

value).

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

1 2 ... 475 476 477 478 479 480 481 482 483 484 485 ... 491 492

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