Re: 400G ER4 wavelengths - two grids

[Brandon Butterworth via NANOG <nanog () lists nanog org>]

On 28/11/2025 04:40:40, "Mark Tinka via NANOG" <nanog () lists nanog org> 
wrote:
> While I like those the most because data centre x-connects will generally be under 2km long, experience is showing that operators 
> are carrying their "LR4" habit into 100G-LR1 world :-).

Distance is a bogus metric, most of the time it's about the loss.

See shrinking link budget for 10km as you go from 1 to 10 to 100G.

> 100G-LR1 plugs are about 12% more expensive than 100G-FR1, on average, but it seems old habits die hard :-).

Having an extra dB or two when equinix are messing in the MMR
is worth it. Also one less type to carry spares for.

brandon
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