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 MAIN SYSTEM (shaded in green)
X
Antenna damaged (failure)
Main Antenna 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: Operating Humidity: Operating Voltage: Operating Current: RF Relay Switching current: Input Current Distribution: Front Panel switches Minimum Alarm trigger time: Minimum Reset trigger time:
-40°C to +60°C 95% RH (non-condensing) at +25°C. +13.8 Vdc Nominal (range +11.0Vdc to +17.0 Vdc) 19mA (+/- 1.0mA) 200mA for 15ms max. 40A Maximum System Reset (momentary pushbutton) Backup Enable (Toggle Switch) Active low input 25ms (6 alarm inputs) Active low input 55ms (2 reset inputs)
Inputs:
• 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)
Outputs:
• 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”)
Module Weight:
1.3 kg (3.0 lb.)
Corrosion Prevention:
Anodized aluminum construction. Stainless steel hardware. Glass epoxy 2 layer printed circuit boards. Gold plated module connectors.
External Connections:
RF Connection: 6 type N connectors located on the module front panel.
Back panel connections
(Power, and Control) using 1 Phoenix screw down header and plug 12 pin connector, 3 2X8-32 Terminal Blocks.
Height: 4.4 cm (1.75”)
Depth: 22.9 cm (9.0”)
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.