6
MDS 1710A/C and MDS 2710A/C/D
MDS 05-3447A01, Rev. F
Antenna System Gain
—A figure, normally expressed in dB, repre-
senting the power increase resulting from the use of a gain-type antenna.
System losses (from the feedline and coaxial connectors, for example)
are subtracted from this figure to calculate the total antenna system gain.
Bit
—The smallest unit of digital data, often represented by a one or a
zero. Eight bits (plus start, stop, and parity bits) usually comprise a byte.
Bits-per-second
—See
BPS
.
BPS
—Bits-per-second. A measure of the information transfer rate of
digital data across a communication channel.
Byte
—A string of digital data usually made up of eight data bits and
start, stop and parity bits.
Decibel (dB)
—A measure computed from the ratio between two signal
levels. Frequently used to express the gain (or loss) of a system.
Data Circuit-terminating Equipment
—See
DCE
.
Data Communications Equipment
—See
DCE
.
Data Terminal Equipment
—See
DTE
.
dBi
—Decibels referenced to an “ideal” isotropic radiator in free space.
Frequently used to express antenna gain.
dBm
—Decibels referenced to one milliwatt. An absolute unit used to
measure signal power, as in transmitter power output, or received signal
strength.
DCE
—Data Circuit-terminating Equipment (or Data Communications
Equipment). In data communications terminology, this is the “modem”
side of a computer-to-modem connection. The transceiver described in
this guide is a DCE device.
Digital Signal Processing
—See
DSP
.
DSP
—Digital Signal Processing. In the transceiver, the DSP circuitry is
responsible for the most critical real-time tasks; primarily modulation,
demodulation, and servicing of the data port.
DTE
—Data Terminal Equipment. A device that provides data in the
form of digital signals at its output. Connects to the DCE device.
Equalization
—The process of reducing the effects of amplitude, fre-
quency or phase distortion with compensating networks.
MDS 05-3447A01, Rev. F
MDS 1710A/C and MDS 2710A/C/D
35
Figure 12
shows an example of a setup for performing network-wide
remote diagnostics from both a Root (master station) location, and a
Node (remote station) location.
Invisible place holder
Figure 12. Network-Wide Remote Diagnostics Setup
If a PC is connected to any radio in the network, intrusive polling
(polling which briefly interrupts payload data transmission) can be per-
formed. To perform diagnostics without interrupting payload data trans-
mission, connect the PC to a radio defined as the “root” radio. A radio
is defined as a root radio using the
DTYPE ROOT
command locally, at the
radio.
A complete explanation of remote diagnostics can be found in MDS’
Network-Wide Diagnostics System Handbook (MDS P/N
05-3467A01). See the Handbook for more information about the basic
diagnostic procedures outlined below.
1. Program one radio in the network as the root radio by entering the
DTYPE ROOT
command at the radio.
2. At the root radio, use the
DLINK ON
and
DLINK [baud rate]
commands
to con
fi
gure the diagnostic link protocol on the RJ-11 port.
RTU
RTU
RTU
MASTER RADIO
DIAGNOSTICS COMPUTER
RUNNING InSite
PAYLOAD DATA
(To SCADA Application)
DIAGNOSTIC DATA
(To InSite)
HOST
COMPUTER
NODE
(Supports Intrusive
Diagnostics Only)
ROOT
(Supports Intrusive or
Non-Intrusive Diagnostics)
