AMX InspiredSignage XPress Features
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AMX InspiredSignage XPress Programming Guide
A Note About Data Polling Rates
When configuring a signage project that polls external server feeds, being aware of sample rates is extremely
important. Content providers can and will throttle, temporarily block, or even permanently block client
requests if their servers are flooded with requests. This is extremely easy to do with a large-scale project. For
example, one player requesting an update on a stock source every ten seconds is probably safe. However, since
most servers don't update their data that often, best practice is to send as few requests as necessary to satisfy
client needs. A good starting point would be twenty or thirty minutes between updates.
One request every ten seconds may not create a red flag for the provider if the requests come from one player,
but consider the project increasing in scale to one hundred players, all running the same project. This now
leads to one hundred players all requesting an update every ten seconds. Even if these were evenly dispersed,
this still leads to ten to one hundred players per second requesting an update. This is likely to be viewed by the
content provider or local IT staff as a denial of service attack and they would be justified to take protective
action if satisfying IS-SPX-1000 requests is putting undue strain on their resources. As an alternative, consider
increasing the interval between update requests, or introduce an aggregate server on your own network to serve
up the data retrieved from the original provider. The aggregate would be one request every ten seconds to the
original content provider and it would handle the subsequent requests from your own network. RSS feed
sources will often include a max-age set in the XML to advise how often the content cache should request an
update from the server.
It should also be noted that if an aggregation server is employed, it is the user's responsibility to ensure that
such an aggregation of that data matches the style and format of any given data request precisely.
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