[EAS] CAP Polling Interval Questions

[Skinner, Jim]

Al:

I would suggest the polling should not be any more than once per minute.
If a particular station or cable can poll more often, then the IPAWS
Aggregator system should be designed to handle it.  As you say, delays
could cause a listener or viewer to be injured. 

If a broadcaster or cable is unable to get a full time internet
connection, then five minutes will be too often.  Some special
provisions should be available for those few extreme cases.  Perhaps
VSAT.  

It is not fair to try and predict where the next emergency event is.
All regions should have the same polling standard.  

Management at a news station wants emergency information immediately.
That is why we should have the option to poll every 5 or 10 seconds if
the local system can handle it.  

By the descriptions posted by others on this list, the packet load for a
simple "no new message" should be very small and not significant.

Thanks for asking!

Jim Skinner CPBE CBNT
Nebraska SECC Chair
KPTM/KXVO TV

-----Original Message-----
From: eas-bounces at radiolists.net [mailto:eas-bounces at radiolists.net] On
Behalf Of Al Kenyon

So, what is the optimal polling interval for a CAP-EAS device?  As an
engineer at heart I have a tendency to over-specify and, in this case
that leads me to recommend a very short polling interval.  What do you
think is the right number? And why?  

If all the stations in your market start out with a CAP polling interval
of once every five minutes what happens if a competitor happens to air
an alert two minutes before your station? 

Should stations in areas with different threats set their polling
intervals differently?

Do you think management would care?  

What happens if one of your listeners is injured during that interval?

Can the various device vendors on this forum comment on a default
polling interval?

As usual, all opinions are welcome.

Al Kenyon
FEMA IPAWS Program Office

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