Media and Telecom Primers

Any in depth primers for the above industries that aren’t the first few to show up on Google? Those are decent but not in depth at all.

Telecom is pretty straightforward except for satellites and c-band and all can be a bit more complicated. I think media is more nuanced in terms of business model / segments operationally even though a lot is also high fixed cost and arpu arpa and PxQ modeling.

Anything helps though either way. Thanks all