GE GFK-2489 User Manual download pdf (Page 182)

GFK-2489 Chapter 9 Terms and Abbreviations 9-5

RFI—Radio Frequency Interference

Roaming—The ability of a station to automatically switch its wireless connection between

various APs as the need arises. A station may roam from one AP to another because the

signal strength or quality of the AP signal has degraded below what another AP can provide.

When two APs are co-located for redundancy, roaming allows the stations to switch between

the radios to provide a robust network.

Roaming may also be employed in conjunction with Portability where the station has been

moved beyond the range of the original AP to which it was associated. As the station comes

in range of a new station, it switches its connection to the stronger signal. Roaming refers to a

station's logical, not necessarily physical, move between APs within a specific network and IP

subnet.

RSSI—Received Signal Strength Indicator

SCADA—Supervisory Control And Data Acquisition. An overall term for the functions

commonly provided through an MAS radio system.

Skip Zone(s)—Groups of operating channels (frequencies) deleted from the radio transmitter

and receiver operating range.

SNMP—Simple Network Management Protocol

SNR—Signal-to-Noise Ratio. A measurement of relative received signal quality. High ratios

likely result in better signal detection and performance.

STP—Spanning Tree Protocol

Standing-Wave Ratio—See SWR.

SWR—Standing-Wave Ratio. A parameter related to the ratio between forward transmitter

power and the reflected power from the antenna system. As a general guideline, reflected

power should not exceed 10% of the forward power (≈ 2:1 SWR).

TCP—Transmission Control Protocol. A “guaranteed delivery” protocol used to set up a

connection between two devices with acknowledgements (ACK/NACK), and retries if the data

is not received properly. Requires more overhead than UDP (see below) but is sometimes

required in mission-critical systems.

Terminal Server—A device that provides a common connection point for serial terminals

(PCs, printers, endpoint devices, etc.) to a Local or Wide Area Network (LAN/WAN). The

terminal converts serial data from these terminals into Internet Protocol (IP). The TS Wireless

AP contains a built-in terminal server.

Throughput—A measure of the quantity of data sent and the speed with which it is

transferred in a network.

TFTP—Trivial File Transfer Protocol

1 2 ... 177 178 179 180 181 182 183 184

No comments

GE GFK-2489 User Manual Page 182