MDS 05-6632A01, Rev. F
MDS Orbit MCR/ECR Technical Manual
391
Hardware Flow Control:
A feature used to prevent data buffer overruns when the unit is handling high-
speed data from an RTU or PLC. When the buffer approaches overflow, the unit drops the clear-to-send
(CTS) line, which instructs the RTU or PLC to delay further transmission until CTS again returns to the
high state.
Host Computer:
The computer installed at the master unit, which controls the collection of data from
one or more remote sites.
IP:
Internet Protocol
LAN:
Local Area Network
LED:
Light Emitting Diode
LNxxx:
Orbit NIC module supporting licensed narrowband operation.
LN400:
Orbit NIC module supporting licensed narrowband operation at 400 MHz.
LN900:
Orbit NIC module supporting licensed narrowband operation at 900 MHz.
mA:
Milliamperes
MAC:
Media Access Control
Narrowband:
These are channel sizes of 25KHz and down. The LN NIC module supports Licensed
Narrowband.
NIC:
Network Interface Card. This is another name for the modules that are selectively included in the
product based on Orbit MCR order entry.
NX915:
Orbit NIC module supporting unlicensed operation at 900 MHz.
Poll:
A request for data issued from the host computer (or master PLC) to a Remote unit.
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.
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.”
SAF (Store and Forward):
An available feature of the unit whereby data is stored by a designated
Remote, and then retransmitted to a station beyond the communication range of the AP.
SCADA (Supervisory Control And Data Acquisition):
An overall term for the functions commonly
provided through a multiple address radio system.
SCEP (Simple Certificate Enrollment Protocol):
A scalable protocol for networks based on digital
certificates, which can be requested by users without the need for assistance or manual intervention from
a system administrator.
Signal-to-Noise Ratio
:
See SNR.
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.
Summary of Contents for MDS ORBIT ECR
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