*From*: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>*To*: <opendtv@xxxxxxxxxxxxx>*Date*: Tue, 23 Dec 2008 22:06:27 -0800

I've had a chance to calculate how many bits per second would be devoted to MPEG-2 transport packets were a broadcaster to devote as much of their transport stream to M/H services. It is 4,572,160 bits per second. Reserve 150 kbps per second for PSI/PSIP (if you are using EtherGuide Emissary) or 400 kbps if using Triveni Guide Builder, and with some allowance for null packets, and you have something North of 4 Mbps. Let me emphasize that this is what would be the bits remaining were a broadcaster to transmit the maximum number of bits per second permitted for ATSC M/H which is 14,197,760 bps. The other end of the spectrum - how many bps could be devoted to main service with the minimum M/H configuration requires more extensive calculations and discussion of features and options, so that will have to wait for "another day." It's possible to transmit at least one SD feed and perhaps two (with some tweaking) in 4 mb/second. John Willkie

**Follow-Ups**:**[opendtv] Re: An M/H calculation***From:*John Willkie

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