 SMPTE 292 Real Time Transfer Rate Payload Bitrate (Mbs) Compression Ratio MB / Second MB / Minute MB / Hour 1485.0 185.625 11,137.500 668,250.000 560.0 70.000 4,200.000 252,000.000 360.0 45.000 2,700.000 162,000.000 270.0 33.750 2,025.000 121,500.000 155.0 19.375 1,162.500 69,750.000 100.0 14.85 12.500 750.000 45,000.000 19.80 9.375 562.500 33,750.000 39.08 4.750 285.000 17,100.000 76.63 2.423 145.350 8,721.000 Standard Definition - SMPTE 259 Ratio Real Time Transfer Rate Payload Bitrate (Mbs) Compression Ratio MB / Second MB / Minute MB / Hour 270.0 33.750 2,025.000 121,500.000 8.438 506.250 30,375.000 6.750 405.000 24,300.000 4.750 285.000 17,100.000 3.375 202.500 12,150.000 13.9:1 2.425 145.500 8,730.000 1.688 101.250 6,075.000 1.125 67.500 4,050.000 38.57:1 0.875 52.500 3,150.000 transmission channel. The reverse is also shown in which content elementary streams are recovered from the transmission and multi- plexing processes. Before explaining how to calculate or estimate payloads for network channels, bit stuffing needs to be explained. Bit stuffing simply adds bits to a signal to make up for differences in digital network channel hierarchy clocking and timing. Network clocking and timing parameters are based on time division multiplexing techniques. This means each channel of a given facility runs on a constant clock, resulting in fixed time intervals of equal dura- tion for each unit of information contained in a byte (octet) or sample. APPENDIX Video Stuff Channel Audio Interface Video Payload Extraction Audio FIGURE 1 Functional Block Diagram Multiplex Channel Interface Channel boundaries occur at fixed intervals marked by framing or overhead bits. Digital signal 0 (DSO, 64Kbs) resides at the bottom of the hierarchy. Multiple DSOs (24 or 32) created from a common clock and multiplexed with other peer streams of channels to build higher order groups of streams capable of carrying disparate traffic pro- duced by independent standard clocks. The channels run in near synchronous mode but carry asynchronous