MDS 05-6628A01, Rev. B
MDS Orbit MCR-4G Technical Manual
85
PLC (Programmable Logic Controller):
A dedicated microprocessor configured for a specific applica-
tion with discrete inputs and outputs. It can serve as a host or as an RTU.
PPM:
Parts per Million
Programmable Logic Controller:
See
PLC
.
Remote Terminal Unit:
See
RTU
.
RTS:
Request-to-send
RTU:
Remote Terminal Unit. A data collection device installed at a Remote unit site.
RX:
Abbreviation for “Receive.”
Signal-to-Noise Ratio:
See SNR.
SCADA (Supervisory Control And Data Acquisition):
An overall term for the functions commonly pro-
vided through an MAS radio system.
SCEP:
Simple Certificate Enrollment Protocol. A scalable protocol for networks based on digital certifi-
cates, which can be requested by users without the need for assistance or manual intervention from a system
administrator.
SNR (Signal-to-Noise ratio):
A measure of how well the signal is being received at a radio relative to noise
on the channel.
SSH:
Secure Shell protocol for a network that allows users to open a window on a local PC and connect to
a remote PC as if they were present at the remote.
SSID (Service Set Identifier):
A name that identifies a particular 802.11wireless LAN.
Supervisory Control And Data Acquisition:
See
SCADA
.
Telnet:
A terminal emulation protocol that enables an Internet user to communicate with a Remote device
for management activities as if it were locally connected to a PC.
TX:
Abbreviation for “Transmit.”
WAN:
Wide Area Network
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