[EAS] CAP Polling Interval Questions

[ed.czarnecki at monroe-electronics.com]

Unless the CAP unit is pulling an audio file from a state server (note on that below), the bandwidth requirements are modest.  Again, the DASDEC would poll the IPAWS RSS feed for an XML script - rough size comparison would be a long-ish script for a text webpage, no graphics, etc...

If a state wanted to send audio via IPAWS, we were told that the IPAWS CAP message would contain a resource link to an audio file that would be hosted on the state CAP server (or third party server).  So in this case, the DASDEC would poll IPAWS for the CAP message, then poll another source for audio.  If the audio was not present, bad file, or not downloadable in a defined timeframe, then the DASDEC reverts to text-to-speech conversion from the the CAP message text.

If there is no internet available at all, that's a different problem.

p.s. - that would be a schema for using IPAWS.  A sizable number of states will use their own CAP systems, and probably connect to IPAWS secondarily.  In these cases (most of them "push") the alert, audio and multimedia would be relayed directly into the DASDEC via satellite and/or internet.

Edward Czarnecki, Ph.D.
Senior Director - Strategy, Development and Regulatory Affairs
Monroe Electronics, Inc. / Digital Alert Systems
ed.czarnecki at monroe-electronics.com

www.monroe-electronics.com
www.digitalalertsystems.com

-----Original Message-----
From: Barry Mishkind [mailto:barry at oldradio.com]

At 08:37 AM 5/11/2011, Alex Hartman wrote:>Plenty of ISP's are "throttling" users that are high-bandwidth hogs.>Comcast particularly. Keeping in mind that EAS/CAP would be a VERY>small portion of this, but a mom and pop shop with a standard cable>modem account from comcast, who downloads programming daily will hit>this cap quite quickly, and thus comcast will "throttle" their Not only Comcast. I know a station with at T-1 that is throttled at 350 kbps ... and the ISP started telling them they were doing something wrong. And it isn't an extreme few that are without solid Internet. Quite a number of stations are on dialup, satellite, or no Internet at all. _______________________________________________This is the EAS Forum Discussion ListPlease invite your friends to join our Forum!http://lists.radiolists.net/mailman/listinfo/easAnd, remember the main page: http://eas.radiolists.net