Question on Picon name definition

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I have been trying to understand the format of picon names. Spent hours Googling and most now makes sense except for a couple of points.

Hope some of the expert on this site can fill in the gaps. From what I can peace together the format seem to be based on the Service Reference in the format 1_0_1_9_2_85_C00000_0_0_0 where C000000 is the namespace. Namespace is in hex. This can be 6 or 7 digits. The first 2 or 3 digits relate to the satellites orbital position. In most cases the last 4 digits of the namespace are 0000, but not always. When they are not 0000 they relate to the transponder frequency. What determines that in some cases these 4 digits should be used to define the transponder frequency and in other this is not required?

The last three places in the namespace are normally 0_0_0. In some picon names these are not zero. When they are not zero what do they mean?

Hope some of you can fill in some or all of the gaps.

Thanks for any help.
 
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