emergency alert system dave swift zach smith. why eas? virginia polytechnic institute client: union...
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![Page 1: Emergency Alert System Dave Swift Zach Smith. Why EAS? Virginia Polytechnic Institute Client: Union College Campus Safety ◦Siren ◦Text Messaging ◦Email](https://reader035.vdocument.in/reader035/viewer/2022062718/56649eb35503460f94bbaaaf/html5/thumbnails/1.jpg)
Emergency Alert Emergency Alert SystemSystem
Dave SwiftZach Smith
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Why EAS?Why EAS?
Virginia Polytechnic InstituteClient: Union College Campus Safety
◦Siren◦Text Messaging◦Email◦Web◦TV (TVuC)◦Radio (WRUC)
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Overall SpecificationsOverall Specifications
Single point to initiate override of both TV and radio◦ Emergency control station (server)
Must always have TV-out enabled Cannot have pop-ups on screen Cannot automatically restart
Points of failure◦ Power & internet required◦ Manual override should internet not be available
Secure◦ Unique user name / password◦ Hardcoded IP address and port
Reliable◦ Must not change the audio or video level◦ Response time of < 2 seconds from activation◦ FCC regulations
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DesignDesign
Hardware◦Switch
8051 IC (CBT3244A)
◦Server Linux
Software◦Java◦C++◦MPG messages
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Launch SequenceLaunch Sequence
Campus emergency present User launches proprietary software Login (user name / password) User presented with list of pre-recorded scenarios User selects scenario from list Hardware activates
◦ Software sends “activate” command to hardware switch◦ Scenario MPG launched full screen◦ Audio and Video streamed to TV◦ Audio streamed to radio
Upon end of emergency, user repeats sequence, and chooses “ALL CLEAR” option◦ Hardware is reset◦ Normal broadcasting resumes
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Current TVuC LayoutCurrent TVuC Layout
Time WarnerHeadend
(channel 21)
Ch.2 Modulator WRUC
A/V Switch- Includes 250gb HD, JPEG
Slideshow Capabilities
MiniDV (video 1)
Computer(video 5)
VCR(video 2)
DVD 1 (video 3)
DVD 2 (video 4)
Monitor
coax composite audio
a/v
a/v
a/va/va/va/va/v
vga
IP Connectiontvuc.union.edu
NetworkPatchPanel
* note: a/v = mono audio and composite video connection
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With EAS AdditionsWith EAS Additions
Time WarnerHeadend
(channel 21)
Ch.2 Modulator WRUC
A/V Switch- Includes 250gb HD, JPEG
Slideshow Capabilities
MiniDV (video 1)
Computer(video 5)
VCR(video 2)
DVD 1 (video 3)
DVD 2 (video 4)
Monitor
coax composite audio
a/v
a/v
a/va/va/va/va/v
vga
IP Connectiontvuc.union.edu
NetworkPatchPanel
* note: a/v = mono audio and composite video connection
EMERGENCY SYSTEM
a/v
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EAS Hardware SwitchEAS Hardware Switch
Emergency ComputerTCP Connection
(To SW Interface)
Emergency Override
(serial)
EmergencyA/V Switch
Input A-1
Input A-2
8051Microcontroller
VOLTAGE OUT
(Enables Input B)
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EAS Switch LogicEAS Switch Logic
TV:◦ Input A-1: Normal Video◦ Input A-4: Normal Audio◦ Input B-4: Emergency Video◦ Input B-1: Emergency Audio
Radio:◦ Input A-1: Normal Audio (left)◦ Input A-4: Normal Audio (right)◦ Input B-4: Emergency Audio (left)◦ Input B-1: Emergency Audio (right)
Common:◦ Vcc: 5V DC◦ GND: Ground◦ Enable A, B: Active Low
http://www.engadget.com/2007/03/13/how-to-make-a-solid-state-a-v-switcher
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ConclusionsConclusions
Single point to initiate override of both TV and radio◦ Emergency control station (server)
Single point to initiate override TV-out always enabled No pop-ups / automatic restart
Manual override implemented◦ Client software installed on server◦ Additional methods of launching
Secure◦ Unique user name / password required◦ IP address and port to be provided by ITS
Reliable◦ Output levels = input levels◦ Response time of hardware ~0.1 seconds◦ FCC regulations met
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Frequency Response of Switch
0.000
0.200
0.400
0.600
0.800
1.000
1.200
0 5 10 15 20 25
Frequence (MHz)
Ou
tpu
t /
Inp
ut
Output/Input
Audio: 44.1 KHz Video: 4.2MHz
AttenuationAttenuation
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What We Have LearnedWhat We Have Learned
Building specifications around a specific client
Building hardware controllers with near 100% uptime & limited points of failure
Preventing computer from crashingLearn how each other’s setup functionsTCP/IP connections in both Java and C/C+
+Scripting
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To Be Implemented…To Be Implemented…
Actual hardware implementationInstall client softwareFinal design paperFinal modifications and updates to WebUser manual
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Future DesignFuture Design
Designing printed circuit boardSoftware GUIBroadcast messages “on the fly”
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Questions?Questions?