RAD Data comm 100 Spezifikationen PDF herunterladen (Seite 17)

Half Duplex

A circuit or device capable of transmitting in two directions, but

not at the same time.

Interface

A shared boundary, defined by common physical interconnection

characteristics, signal characteristics, and meanings of exchanged

signals.

IP Address

Also known as an Internet address. A unique string of numbers

that identifies a computer or device on a TCP/IP network. The

format of an IP address is a 32-bit numeric address written as four

numbers from 0 to 255, separated by periods (for example,

1.0.255.123).

Jitter

The deviation of a transmission signal in time or phase. It can

introduce errors and loss of synchronization in high speed

synchronous communications.

Laser

A device that transmits an extremely narrow and coherent beam

of electromagnetic energy in the visible light spectrum. Used as a

light source for fiber optic transmission (generally more expensive,

shorter lived, single mode only, for greater distances than LED).

Loopback

A type of diagnostic test in which the transmitted signal is

returned to the sending device after passing through all or part of

a communications link or network.

MAN (Metropolitan Area

Network)

A network that provides regional connectivity within a

metropolitan area (such as a city).

Manager

An application that receives Simple Network Management Protocol

(SNMP) information from an agent. An agent and manager share a

database of information, called the Management Information Base

(MIB). An agent can use a message called a traps-PDU to send

unsolicited information to the manager. A manager that uses the

RADview MIB can query the RAD device, set parameters, sound

alarms when certain conditions appear, and perform other

administrative tasks.

Master Clock

The source of timing signals (or the signals themselves) that all

network stations use for synchronization.

Multimode Fiber

A fiber with a large core diameter; 50-200 microns compared with

the wavelength of light. It therefore propagates more than one

mode. With multimode fiber, light traverses multiple paths, some

longer than others. This leads to dispersion, which reduces optical

range.

Multiplexer

At one end of a communications link, a device that combines

several lower speed transmission channels into a single high speed

channel. A multiplexer at the other end reverses the process.

Sometimes called a mux. See Bit Interleaving/Multiplexing.

Network

(1) An interconnected group of nodes. (2) A series of points,

nodes, or stations connected by communications channels; the

collection of equipment through which connections are made

between data stations.

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