Westel Wireless Systems CI00059 User Manual
Installation and Operator Handbook Equipment Description
CONTENTS
2 EQUIPMENT DESCRIPTION
2.1 I
2.2 P
NTRODUCTION
OWER SOURCE OPTIONS
....................................................................................................................................................2
.....................................................................................................................................2
2.2.1 AC Power Supply ........................................................................................................................................2
2.2.2 DC Power Supply........................................................................................................................................2
2.2.3 AC Powered with DC Revert.......................................................................................................................3
2.2.4 Reference Oscillator Backup Power ...........................................................................................................3
2.3 P
LUG-IN MODULES
..............................................................................................................................................4
2.3.1 Transceiver Module.....................................................................................................................................4
2.3.2 Controller Module.......................................................................................................................................6
2.3.3 Power Amplifier Module.............................................................................................................................8
2.3.4 Power Supply Module .................................................................................................................................9
2.3.5 Interface Module .......................................................................................................................................11
LIST OF FIGURES
F
IGURE
F
IGURE
F
IGURE
F
IGURE
F
IGURE
F
IGURE
F
IGURE
2-1 P
OWER DISTRIB UTION OF AN
2-2 P
OWER DISTRIB UTION OF A
2-3 T
RANSCEIVER MODULE FRONT PANEL
2-4 C
ONTROLLER MODULE FRONT PANEL
2-5 P
OWER AMPLIFIER MODULE FRONT PANEL
2-6 P
2-7 I
OWER SUPPLY MODULE FRONT PANEL
NTERFACE MODULE FRONT PANEL
AC
DC P
POWERED
OWERED
DRB-25....................................................................................2
DRB-25......................................................................................3
..........................................................................................................5
...........................................................................................................7
...................................................................................................9
.....................................................................................................10
.............................................................................................................11
Page
2-1 T
RANSCEIVER MODULE CONTROLS AND INDICATORS
2-2 C
ONTROLLER MODULE CONTROLS AND INDICATORS
2-3 P
OWER SUPPLY MODULE CONTROLS AND INDICATORS
2-4 I
NTERFACE MODULE EXTERNAL INTERFACES
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LIST OF TABLES
................................................................................................6
.................................................................................................8
............................................................................................11
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Installation and Operator Handbook Equipment Description
2 EQUIPMENT DESCRIPTION
2.1 INTRODUCTION
DRB-25 equipment consists of modular hardware which is easily installed as a desktop cabinet, floor-mount
cabinet or into standard 19 inch racks.
The DRB-25 chassis and its component modules are described in the following paragraphs.
2.2 POWER SOURCE OPTIONS
2.2.1 AC Power Supply
The DRB-25 may be powered from the 240 or 110 V AC power supply via one or two Power Supply
Modules. Figure 2-1 shows the power distribution of an AC powered DRB-25.
12V DC
Standby
110/240 V
AC Supply
Switch
Figure 2-1 Power Distribution of an AC powered DRB-25
2.2.2 DC Power Supply
The DRB-25 may be powered from 12 or 24 or 48 V DC power supplies via one or two DC/DC Power
Supply Modules. Alternatively, the DRB-25 may be powered directly from DC power sources as follows:
Power Supply
Module 1
Fans
System
PSU
Option for Second Channel
Power Supply
Module 2
7 V
12 V
Power Amplifier 1
Transceiver Module 1
Controller & Interface
Modules
Transceiver Module 2
Power Amplifier 2
• 12 V DC to 13.8 V DC (for 60 watt Power Amplifier Modules).
• 24 V DC to 28 V DC (for 125 watt Power Amplifier Modules).
Note that the RF output power of the DRB-25 is derated by 3 dB if the DC voltage is at the low end of the
range (i.e. at 12 or 24 V DC). When operating from a direct DC power source the Power Supply Modules are
replaced with blank panels.
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Installation and Operator Handbook Equipment Description
Figure 2-2 shows the power distribution of a DC powered DRB-25.
12V DC
Standby
12/24V DC
Supply
Switch
Option for Second Channel
Figure 2-2 Power Distribution of a DC Powered DRB-25
2.2.3 AC Powered with DC Revert
The DRB-25 may be powered from the 240 or 110 V AC power supply via one or two Power Supply Modules
with provision for 12 or 24 V DC revert in the event that the AC power fails. The DC revert options are:
Optional DC/DC
Converter
Fans
System
PSU
Optional DC/DC
Converter
7 V
12 V
Power Amplifier 1
Transceiver Module 1
Controller & Interface
Modules
Transceiver Module 2
Power Amplifier 2
• 12 V DC to 13.8 V DC (for 60 watt Power Amplifier Modules).
• 24 V DC to 28 V DC (for 125 watt Power Amplifier Modules).
When using DC revert the RF output power of the DRB-25 is derated by 3dB if the DC voltage is at the low
end of the range (i.e. At 12 or 24 V DC). When operating from a direct DC power source the Power Supply
Modules are replaced with blank panels.
AC powered with 48 V DC revert is also available using external power supplies, however, where a 48 V DC
battery backed supply is available it is generally preferable to use this as the main power source for the DRB-
25.
2.2.4 Reference Oscillator Backup Power
The DRB-25 has provision for a user to connect a 12 V DC backup supply to keep the system reference
oscillator oven at its operating temperature in the event of a brief primary power failure. An interface module
connector acts as the connection point for the keep-alive power.
If the backup supply is not used, any interruption to the primary supply requires a start-up cycle of up to ten
minutes in which the reference oscillator heats up.
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Installation and Operator Handbook Equipment Description
2.3 PLUG-IN MODULES
The DRB-25 has the following types of plug-in Modules:
• Transceiver Module.
• Controller Module.
• Power Amplifier Module.
• Interface Module.
• Power Supply Module.
2.3.1 Transceiver Module
The Transceiver Module (TM) provides full duplex radio operation for analog and digital modulation
schemes. Each module consists of an RF card for receive and transmit and a daughter board for digital signal
processing. Modules are standard half-Eurocard layout measuring 10.5 inches (6 Rack Units) high by 10
inches (250 mm) deep. The Transceiver Modules plug into a common backplane with the Controller Module,
providing seamless transfer and switching of traffic and control data.
Transceiver Modules are specific to frequency bands and are available for frequency bands; VHF (136 to 174
MHz), and UHF (low) (400 to 470 MHz). Each Transceiver module may be programmed with up to 512
channels.
Transceiver Modules of different bands are interchangeable provided the associated Power Amplifier is also
changed. The Transceiver Module is powered by 12 V and 7 V supplies from the System Power Supply
within the case of the DRB-25.
Two RJ style connectors are provided on the module front panel. The upper connector (RJ11) provides a
standard RS-232 serial interface which allows maintenance staff to program and configure the module using
the Transceiver Module Programmer application software from an external PC. The lower (RJ45) connector
provides an audio interface for the connection of a speaker, microphone or handset.
Internally to the DRB-25 the Transceiver Module provides two connections to its associated power amplifier;
the RF output and a serial data link for control and communication between the two modules. Figure 2-3
shows the front panel controls, indicators and connectors and Table 2-1 lists the control and indicator
functions.
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