Microwave Data Systems MDS entraNET 2400 Especificaciones descargar pdf (Pagina 145)

MDS 05-4055A01, Rev. A MDS entraNET 900 System Guide 137

connected to an access point can be turned off, moved to another place,

turned back on, and when the right information is entered can immedi-

ately reconnect to the access point without user intervention.

PLC—Programmable Logic Controller. A dedicated microprocessor

configured for a specific application with discrete inputs and outputs. It

can serve as a host or as an RTU.

Remote—A transceiver in a network that communicates with an asso-

ciated Access Point unit.

Remote Terminal Unit—See RTU.

RFI—Radio Frequency Interference

Roaming—A station's ability to automatically switch its wireless con-

nection between various Access Points 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 units 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 will

switch 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

RTU—Remote Terminal Unit. A data collection device installed at a

Remote radio site.

SCADA—Supervisory Control And Data Acquisition. An overall term

for the functions commonly provided through an MAS radio system.

Seamless Mode—A technique used in MDS devices that accommo-

dates protocols that do not tolerate gaps in the middle of a frame (e.g.,

MODBUS™ ASCII). In these protocols, gaps are interpreted by the

connected device as an “end-of-frame” indication, which may cause

errors. Seamless mode resolves this through the use of buffers.

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 will likely result in better signal detection and

performance.

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Microwave Data Systems MDS entraNET 2400 Especificaciones Pagina 145