Model Number Codes; Terms And Abbreviations - GE MDS 4790M Installation And Operation Manual

THIS INFORMATION IS
SUBJECT TO CHANGE.
DO NOT USE FOR
PRODUCT ORDERING.
6

2.6 Model Number Codes

The radio model number is printed on the serial number label, which is affixed
to the radio chassis. The following figures show the significance of the
characters in the model number string for standard models. Contact the factory
for specific information on optional configurations.
DUPLEXER
(0) None (Ext. wiring)
(2) 400-512 MHz (5-30 MHz Split)
(B) Simplex 430-512 MHz
(S) None (Int. wiring)
MODE
(N) Non -Redundant
(R) Redundant
4790M
OPERATION
(B) Base
(R) Remote
(P) Repeater
INPUT VOLTAGE
(1) 24 VDC
(2) 48 VDC
(3) 24-48 VDC
(A) 110/220 VAC W/O Batt.
(B) 110/220 VAC W/ Batt.
125 VAC to 12 VDC W/ Ext. Converter
Figure 4. MDS 4790M Model Number Codes

2.7 Terms and Abbreviations

If you are new to digital radio systems, some of the terms used in this guide
may be unfamiliar. The glossary below defines many of these terms and will
prove helpful in understanding radio operation.
Active Messaging—This is a mode of diagnostic gathering that may interrupt
SCADA system polling communications (contrast with passive messaging).
Active (or intrusive) messaging is much faster than passive messaging because
it is not dependent upon the RTU polling cycle.
BERT—Bit-error rate test. The results of a BERT are normally expressed as a
ratio (power of 10) of the number of bits received in error compared to the total
number received.
BER—Bit-error rate. See also BERT.
Bit—Binary digit. The smallest unit of digital data, often represented by a one
or a zero. Eight bits usually comprise a byte.
bps—Bits-per-second. A measure of the information transfer rate of digital
data across a communication channel.
Byte—A digital "word" usually made up of eight bits.
dBi—Decibels of gain relative to an isotropic radiator. (A hypothetical antenna
which radiates equally in all directions.) Used to express antenna gain.
dBm—Decibels relative to one milliwatt. An absolute unit used to measure
signal power, as in transmitter power output or received signal strength.
MDS 4790M (MPT 1411) I/O Guide
Invisible place holder
RECEIVE FREQ.
(J) 457.5-458.5 MHz
(K) 463.0-464.0 MHz
BANDWIDTH
(1) 12.5 kHz
MODEM
(B) 9600 BPS
(MPT 1411)
TRANSMIT FREQ.
(D) 457.5-458.5 MHz
DIAGNOSTICS
(E) 463.0-464.0 MHz
(0) None
(1) Network wide
AGENCY
(N) N/A
SAFETY CERT.
(N) N/A
FEATURES
(0) Full
(D) Demo
MDS 05-3628A01, Rev. B