1. 3Gbps SMPTE 292M compliant SDI interface Gennum Corporation

2. Simple model of Coax cable loss Gennum Corporation Simple model doesn’t account for dielectric effect – but it’s close enough The important thing to note is that the loss variation is with square root of frequency

3. Assuming 140m of Beldin 1694 Coax cable this model yields a loss of…….. Gennum Corporation Frequency [MHz] Loss at 140m (1694)[dB] 750MHz (1.485Gb/s)23 1500MHz (3.0Gb/s)34 3000MHz (6.0 Gb/s)50

4. Current physical interface SDI chips can be modified to reliably (in real systems) recover up to 30dB of loss and remain within SMPTE 292M specification limits at 3Gb/s Gennum Corporation Experimental work to date however shows that this is about as far as we can go without changing existing standards / specifications The following charts illustrate test results from prototype silicon

5. Equalizer at 3Gbps,PrN23: Belden 1694 0.2UI

6. 3Gbps @ 140m, Belden 1694

7. The important points to note however are that cable loss dominates Gennum Corporation Pathological is not the limiting factor AND

8. In summary Gennum Corporation

9. A fully standards compliant multi-rate (143Mb/s ~ 3Gb/s) SDI interface over Coax cable could be implemented today Gennum Corporation No new installation practices or infrastructure change required to go to higher data rates 3Gb/s provides a useful ‘building block’ for multi-link interface capable of addressing 2K and 4K 4:4:4 formats

10. It’s familiar – uses all the existing SDI technologies and techniques we know and love today Gennum Corporation Relatively inexpensive solution – compared to data comm / telecom fiber solutions

11. Some questions…… Gennum Corporation At 3Gb/s, is backwards compatibility with existing SDI infrastructure more important than forwards compatibility with Fiber Is a 100m interface sufficient ?