Satellite Modem Overview
• Use the same transponders used to deliver TV
• Standards
– DSS: Hughes Network Systems (HNS) proprietary
– DVB (ETS 300-421): Open standards consortium
– Primestar (ITU-R 217/11): Being phased out
• Issues
– Shared media
– Unidirectional, return channel is via modem
• Estimated $100M modem sales in 1999
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