Specifications

05-4055A01, Rev. D GE MDS entraNET Reference Manual 199
Point-Multipoint System—A radio communications network or
system designed with a central control station that exchanges data with
a number of remote locations equipped with terminal equipment.
Poll—A request for data issued from the host computer (or master PLC)
to a Remote radio.
Portability—Refers to the ability of a transceiver to connect to an AP
from multiple locations without the need to reconfigure the network set-
tings. For example, a transceiver located in one place and connected to
an AP can be turned off, moved to another place, turned back on; and,
when the right information is entered, can immediately reconnect to the
AP without 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 endpoint device.
Remote—A transceiver in a network that communicates with an asso-
ciated AP radio.
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 sta-
tion's logical, not necessarily physical, move between APs within a spe-
cific 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.