[alexhawdon]

My last ADSL router/modem from Vodafone (UK telecoms/broadband company - unsure who the OEM was) was amazing in this respect. You could configure it to have all the lights off by default, and it had an infrared proximity sensor built into the top - wave your hand to activate the blinkenlights.

[Nextgrid]

LEDs on most networking equipment are software-controlled. I can disable them on my OpenWrt devices and even the Devolo stock firmware also included a feature to disable LEDs.