What is 'requests' in Targetspot stats?

[outpostradio]

The current Targetspot stats page shows allocations, impressions, fill rate, and requests. The first three are defined, but not 'requests'. Anyone know what 'requests' refers to? It is a much larger number than any of the others.

[outpostradio]

I emailed this question to support and this is the response:

The requests are the number of ads and PSA's calculated by the ad server for the players connected to your stream.
That number will always be higher than the allocations/impressions number for several reasons:
- The calculation occurs less than 60 seconds after the connection of a player. If the player is disconnected before you trigger the ads or if the ad server re-calculates the ads between the first minute of the connection and the first ads triggering, you'll find those requests on your Targetspot page, but they have not resulted in allocations/impressions.
- The ad server calculates more ads/PSA's than the actual ad break duration set on your Radio Manager.