TL;DR: The LEDs on an RJ45 jack (母座) are PHY-driven status lights, not part of the data path — and their colours are conventions, not a standard.
- Common convention: solid green = link up, blinking = activity; a second amber/green LED = speed. The chip/equipment vendor picks the mapping.
- What is fixed: IEC 60603-7 (jack mechanics), ANSI/TIA-568 (pinout), IEEE 802.3 (electrical link) — none of them fixes LED colour.
- VOOHU jacks: integrated LEDs, green ≈568 nm, yellow ≈585 nm, driven up to 20 mA, in codes like G/Y, G/G, G/O, G/R; light-pipe options too.
- Design tip: decide the LED mapping at the PHY; pick the jack LED colours to match your faceplate/OEM convention.
Full guide: https://voohuelectronic-ux.github.io/voohu-rj45-guide/resources/rj45-jack-led-indicators.html
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