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HDMI to SDI Converter

CVT-HDMI-SDI

Converts an HDMI source to SDI for long professional-video runs.

Type: Converter
Connectors: HDMI / BNC

In-depth technical details

HDMI Type-A carries 19 pins: TMDS pairs for the video/audio signal itself, plus control lines -- CEC (single remote controlling multiple devices), DDC/+5V (the EDID handshake that lets the source learn the display's supported resolutions), and HPD (Hot Plug Detect, how the source knows a display is actually connected). BNC connectors come in two incompatible impedances: 50 ohm (RF/data standard) and 75 ohm (video/broadcast standard) -- mixing them causes real signal loss (about 5% per mismatch point) from impedance-mismatch reflection, a common mistake when a 50 ohm BNC cable ends up on a 75 ohm CCTV run.

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End A

HDMI Type-A

01 19 pins Three differential TMDS pairs carry picture and sound, a fourth carries the clock, and the rest are named-function pins.
02 CEC A single wire that lets one remote control multiple connected devices, e.g. a TV and a receiver.
03 DDC / +5V The EDID handshake -- how the source learns which resolutions the display supports.
04 HPD Hot Plug Detect -- how the source knows a display is connected at all.
05 Metal shell The shell is grounded and wraps the pins, keeping interference out of a very high-frequency signal.
06 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
07 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

End B

BNC

01 Centre conductor Carries the video signal — the copper wire at the very core of the coaxial cable.
02 Bayonet lock Push and give it a quarter turn to lock. That is what keeps a camera connected on a pole in the wind.
03 Braided shield The copper braid surrounds the core and holds the cable's impedance constant along the whole run (50 or 75 ohm, depending on the cable).
04 50Ω vs 75Ω BNC connectors come in two incompatible impedances: 50 ohm (RF/data standard) and 75 ohm (video/broadcast standard). Mixing them causes real signal loss (about 5% per mismatch point) — a common mistake when a 50 ohm BNC cable ends up on a 75 ohm CCTV run.
05 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
06 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

SDI is the professional broadcast standard: it carries uncompressed video over a single coaxial BNC cable for well over 100 metres without repeating the signal -- far past HDMI's practical cable-length limit. The converter electrically rebuilds the signal between the two protocols, and it is directional -- an HDMI-to-SDI converter does not work in reverse.

Function: Active protocol conversion between broadcast SDI and consumer HDMI
Why SDI: Runs 100m+ over coax without a repeater, far past HDMI's practical range
Direction: One way only -- check which side is the input

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Applications

Connecting a modern device to an older screen
Driving a meeting-room projector

Technical specifications

Type	Converter
Connectors	HDMI / BNC

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