WDS P20, Инструкция по установке и эксплуатации

Страница: 8 / 32

4
2.5 Replacement Parts
Table 1 lists parts available to replace Redundant Transceiver Chassis
components should they fail.
3.0 GLOSSARY OF TERMS
If you are new to radio, some of the terms used in this guide may be
unfamiliar. The following glossary explains many of these terms and
will prove helpful in understanding the operation of the transceiver.
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 of the ratio between two signal levels. Fre-
quently 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.
Table 1. Replacement part numbers
Power Supply 03-1143A12 115/230 VAC
03-2613A02 18-36 VDC
03-2613A03 36-75 VDC
03-2613A04 10.5-16 VDC
Switchover Logic Board 03-3306A01
Battery Control Board 03-3362A01
Indicator Board 03-3307A01
Backup Battery 28-1575A03