Redundant Radio Systems - Daniels Electronics

Daniels Crossband
Radio Repeater with
redundant switchover, monitoring
and alerting capability.
When downtime is not an option...
REDUNDANT RADIO SYSTEMS
The Daniels Redundant Switch facilitates
automatic or remote user-controlled switching
to a Backup radio system

Redundant Switching: System Description
Sample Application
X
Antenna
damaged (failure)
Main
Antenna
MAIN SYSTEM (shaded in green)
connection to radio
Main Radio
Redundant Switch
Backup Radio
Automatic switchover after failure
Backup
Antenna
Site Monitoring /Controlling Option:
A signal is sent to a base console to alert
that a switchover has occured due to a
failure related to the antenna.
connection to radio
DUPLICATE BACKUP SYSTEM (shaded in yellow)
A failure in the main system (shaded in green) causes an automatic complete switchover to the
duplicate (redundant) backup system (shaded in yellow). The Redundant Switch transfers DC
Power and RF signals from the Main to the Backup.
Common Configurations
Configuration 1: Basic Redundant Switch setup (no remote switching)
This configuration consists of two Daniels radio repeaters, two power monitors and the Redundant Switch. Upon an
alarm condition from the power monitors or from one of the other inputs, the Redundant Switch will automatically
switch from the Main to the Backup radio. Once the system has switched to the Backup radio, it may be switched back
to the Main by pushing the “Reset” button on the front panel. An optional status tone generator may be added to the
Backup system to indicate that the system has been switched.
Configuration 2: Redundant Switch with Remote Site Monitoring and Controlling
This configuration adds a Daniels SITE/MC Site Monitor and Controller. In this configuration, the system can be
remotely switched from the Main to the Backup and back again if required. The SITE/MC also allows the user to
monitor alarms at a base console. This can provide the user with valuable information on which alarm has triggered the
switching function before a visit to the site for maintenance.
Configuration 3: Conserving battery life by turning off equipment
Besides enabling Backup systems, the Redundant Switch could also be used to turn off complete racks of equipment
to reduce battery drain during the winter months. Only one subrack with a monitor receiver needs to be on to receive
a DTMF tone to trigger the switching.
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Equipment Description
Redundant Switch
The Redundant Switch is a 1U high, 19” rack mountable unit that switches DC Power and RF Inputs between radio
systems. The Redundant Switch allows the Main or Backup (redundant) radio system to be selected for operation.
The switching can be controlled manually via wireline or a received DTMF tone. Alternatively, it can be set up for
automatic switchover via the use of various alarm modules such as the Daniels Power Monitors and/or the Daniels
SITE/MC Site Monitor and Controller.
The Redundant Switch also has two high quality internal RF antenna relays that can be used when the user does not
require a complete redundant antenna system. This relay option can combine the Main A-side radio transmitter and
receiver pair into one “Antenna A” output. The B-side Main and Backup can also be combined into one “Antenna B”
output.
The SITE/MC & siteView Software provide the Site Monitoring & Controlling Option
Site/MC
The Daniels Electronics SITE/MC is a telemetry device for
site monitoring, alarming and remote control. The
SITE/MC monitors inputs from up to 8 analog and 8
digital sensors. Commands may also be sent back to the
SITE/MC to control up to 8 outputs. These outputs can
trigger the Redundant Switch or other switches (e.g. a
high performance relay to switch to a backup power
source).
SiteView Software
The Daniels TASC siteView software is custom
configurable (including its look and feel) and can be set to
automatically poll the remote SITE/MCs at regular
intervals. If a certain parameter being monitored at the
radio site goes beyond a user-defined limit, an alarm can
be triggered in the siteView software.
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Redundant Switch Specifications
Operating Temperature Range: -40°C to +60°C
Operating Humidity:
95% RH (non-condensing) at +25°C.
Operating Voltage:
+13.8 Vdc Nominal (range +11.0Vdc to +17.0 Vdc)
Operating Current:
19mA (+/- 1.0mA)
RF Relay Switching current: 200mA for 15ms max.
Input Current Distribution: 40A Maximum
Front Panel switches
System Reset (momentary pushbutton)
Backup Enable (Toggle Switch)
Minimum Alarm trigger time: Active low input 25ms (6 alarm inputs)
Minimum Reset trigger time: Active low input 55ms (2 reset inputs)
Inputs:
Outputs:
• 6 active low alarm inputs (require a momentary low input from an open
collector or a relay input)
• 2 Reset inputs active low (momentary)
• 1 Backup Test Enable/Disable (low to disable Backup Test)
• 2 Alarm open collector outputs (Latched)
(Alarm O/P1 low for Main indication, Alarm O/P2 low for Backup indication)
Physical Dimensions: Width: 48.3 cm (19”) Height: 4.4 cm (1.75”) Depth: 22.9 cm (9.0”)
Module Weight:
Corrosion Prevention:
External Connections:
Back panel connections
1.3 kg (3.0 lb.)
Anodized aluminum construction. Stainless steel hardware.
Glass epoxy 2 layer printed circuit boards. Gold plated module connectors.
RF Connection: 6 type N connectors located on the module front panel.
(Power, and Control) using 1 Phoenix screw down header and plug 12 pin
connector, 3 2X8-32 Terminal Blocks.
43 Erie St. Victoria BC, Canada V8V 1P8
Email: sales@danelec.com
Toll Free Phone: 1-800-664-4066 Toll Free Fax 1-877-750-0004
Outside U.S. & Canada, Phone: 250-382-8268, Fax: 250-382-6139
LIT-038-1-0-0 October 26, 2004
© Copyright Daniels Electronics Ltd. All rights reserved.