1. Emergency Alert System
Dave Swift
Zach Smith

2. Why EAS? Virginia Polytechnic Institute
Client: Union College Campus Safety
Siren
Text Messaging
Web
TV (TVuC)
Radio (WRUC)
Why EAS?

3. Overall 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
Overall Specifications

4. Design Hardware Software Switch Server Java C++ MPG messages 8051
IC (CBT3244A)
Server
Linux
Software
Java
C++
MPG messages
Design

5. Launch 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
Launch Sequence

7. Current TVuC Layout WRUC A/V Switch
Time Warner
Headend
(channel 21)
coax
Ch.2 Modulator
composite audio
a/v
Network Patch Panel
A/V Switch
- Includes 250gb HD, JPEG Slideshow Capabilities
a/v
Monitor
IP Connection tvuc.union.edu
a/v
vga
a/v
a/v
a/v
a/v
MiniDV (video 1)
VCR
(video 2)
DVD 1 (video 3)
DVD 2 (video 4)
Computer
(video 5)
* note: a/v = mono audio and composite video connection
Current TVuC Layout

8. With EAS Additions WRUC EMERGENCY SYSTEM A/V Switch Time Warner
Headend
(channel 21)
coax
Ch.2 Modulator
composite audio
a/v
EMERGENCY SYSTEM
a/v
Network Patch Panel
A/V Switch
- Includes 250gb HD, JPEG Slideshow Capabilities
a/v
Monitor
IP Connection tvuc.union.edu
a/v
vga
a/v
a/v
a/v
a/v
MiniDV (video 1)
VCR
(video 2)
DVD 1 (video 3)
DVD 2 (video 4)
Computer
(video 5)
With EAS Additions
* note: a/v = mono audio and composite video connection

9. EAS Hardware Switch Emergency Computer Emergency A/V Switch 8051
TCP Connection
(To SW Interface)
Emergency Override
(serial)
Input B-1
Input B-2
8051
Microcontroller
Input A-1
Emergency
A/V Switch
VOLTAGE OUT
(Enables Input B)
Input A-2
Output 1
Output 2
EAS Hardware Switch

12. EAS Switch Logic TV: Radio: Common: 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
EAS Switch Logic

13. Conclusions 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
Conclusions

14. Attenuation
Audio: 44.1 KHz Video: 4.2MHz

16. What We Have Learned Building specifications around a specific client
Building hardware controllers with near 100% uptime & limited points of failure
Preventing computer from crashing
Learn how each other’s setup functions
TCP/IP connections in both Java and C/C++
Scripting
What We Have Learned

17. To Be Implemented… Actual hardware implementation
Install client software
Final design paper
Final modifications and updates to Web
User manual
To Be Implemented…

18. Future Design Designing printed circuit board Software GUI
Broadcast messages “on the fly”
Future Design

19. Questions?