©2007 Belden All About HDMI Steve Lampen Multimedia Technology Manager Belden

©2007 Belden What is HDMI?  High Definition Media Interface  A transmission standard.  Invented by seven CE companies  Copy protection ‘handshake’.  No recording devices.  Won’t work “too well”.

©2007 Belden What is HDMI?  19 conductors –3 shielded twisted pairs: data –1 shielded twisted pair: clock 100Ω±15Ω –1 wire for control CEC (Consumer Electronics Control) –2 wires for 2-way communication (DDC): High-bandwidth Digital Content Protection (HDCP) EDID reading Handshaking –1 wire for +5v (50mA) –5 ground wires for –1 wire for Hot Plug Detection –1 wire reserved for future use

©2007 Belden Handshake  EDID and DDC –DDC Display Data Channel (DDC2) 2-way communication channel –EDID Extended Display Identification Data Read through the DDC VESA standard –Video Electronics Standards Association »Manufacturer’s name »Product type »Phosphor or filter type »Timings supported by the display »Display size »Luminance data »Pixel mapping data.

©2007 Belden Cable Construction

©2007 Belden HDMI Connector Nineteen pins in a tiny connector! Big, heavy, and non-locking.

©2007 Belden Bandwidth & Data Rate  Category p/1080i –74.25 MHz clock Mbps –148.5 MHz clock Gbps  Category 2 – 1080p –165 MHz clock 1.65 Gbps per pair –340 MHz clock "equalized". 3.4 Gbps per pair 10.2 Gbps payload

©2007 Belden Testing & Limitations  Anything works if it is short enough.  Cable tends to be big.  Gage sizes… –22 AWG, rare, the biggest –24 AWG, very common, big –26 AWG, common –28 AWG, smaller, short runs –30 AWG, rare, very short runs

©2007 Belden Test Results

©2007 Belden Test Results

©2007 Belden Eye Pattern Requirements

©2007 Belden Category 1 – MHz

©2007 Belden Category 2 – 165 MHz

©2007 Belden Category 2 – 340 MHz w/EQ

©2007 Belden Eye Patterns at 50 ft. 720p Belden Cable Chinese Cable

©2007 Belden Eye Patterns at 50 ft. 1080p Belden Cable Chinese Cable

©2007 Belden Construction Options  Bonded pairs –Belden patent Improved impedance stability Improved return loss Improved inter-pair skew Dramatically improved intra-pair skew

©2007 Belden Active HDMI  Active reclocking, EQ’ing –Dramatic increase in distance ~150 ft. –Usually uses same HDMI cable with boxes  Belden and Gennum joint venture –100 meters (328 ft.) HDMI –1080p/60 –“Secret” cable construction

©2007 Belden Further Considerations  Exactly what do eye patterns tell us? –Effect of attenuation (AWG) –Effect of crosstalk –Effect of jitter –Effect of return loss (impedance variations)  We could do this all on one coax!  The cost of eye-pattern test gear  Display Port  Many thanks to HDMI Licensing ( and

©2007 Belden 6,000 pages 1,000,000+ hits per week Samples: