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iPump 6420 User’s Manual
www.wegener.com 800070-01 Rev B Chapter 1, Page 4
The non-real-time portion of the S/F sub-system accepts a schedule file, on a regular basis,
for each supported affiliate site. This schedule will define local spots, as files, to be played in
each available segment of the day. These segments are defined by the radio network
management as those portions of each hour where specific spots will be eligible for play at the
remote receiving i6420 sites. And for each segment of each hour of each day, a playlist name is
defined. For each affiliate, that playlist may define a different file, or no file at all. The Compel
network control system then orders the building of those playlists on the affiliate i6420s. In
addition, the referenced files are also ordered for downloading. The file will be pulled (or
pushed) from a file server in the customer traffic system, and then broadcast by UDP to a
“satellite” IP address. The emitted UDP messages are encapsulated by MPE protocol, creating a
Transport stream which is re-multiplexed with the main Transport and sent over the satellite to
the receiving i6420s. The Compel control stream bears control commands that instruct which
i6420s, or which groups of i6420s, will receive each file. While setting up the affiliate i6420s,
the Compel system also sets up it’s internal scheduling mechanism to re-assign known incoming
customer closures, for the supported networks, each to a new playlist-execution command on
each segment’s time boundary. This sets up the real-time portion of the S/F system.
In real-time, Figure 1-2 represents a method by which the S/F system creates localization
under central control. On a PIO input assigned for spots on a specific supported networks, the
Compel system receives a closure from the customer’s traffic system. The customer’s traffic
system sends this closure to coincide with the start of a network-wide spot, the default play for
any “linear” edge receiver. At the time that closure is received by Compel, it causes a playlist-
execution command to be emitted to the entire network of i6420s. The name of the playlist has
been assigned by the Compel scheduler for that network, day, hour, and segment. The remote
affiliate iPumps either have that playlist defined or not. If not, they continue decoding the live
network feed, playing out the “network” spot. If they do have that playlist defined, those i6420s
each mute the live network feed, and instead, insert the audio for the referenced file, a local spot.
As the spot concludes, the live network feed unmutes and resumes on the i6420 audio output.