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Emergency Alert Emergency Alert SystemSystem
Dave SwiftZach Smith
Why EAS?Why EAS?
Virginia Polytechnic InstituteClient: Union College Campus Safety
◦Siren◦Text Messaging◦Email◦Web◦TV (TVuC)◦Radio (WRUC)
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
DesignDesign
Hardware◦Switch
8051 IC (CBT3244A)
◦Server Linux
Software◦Java◦C++◦MPG messages
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
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
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
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)
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
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
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
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
To Be Implemented…To Be Implemented…
Actual hardware implementationInstall client softwareFinal design paperFinal modifications and updates to WebUser manual
Future DesignFuture Design
Designing printed circuit boardSoftware GUIBroadcast messages “on the fly”
Questions?Questions?
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