100G-LR1 (DR/FR)

Tue Apr 4 06:54:38 UTC 2023

On Tue Apr 04, 2023 at 08:54:55AM +1200, Tony Wicks wrote:
> I have been using the  QSFP-100G-CWDM4 2k optics for within rack/DC
> for a couple of years now. They are about the same price as SR optics
> but allow the use of simple duplex single mode patches without blasting
> 10K optics at each other over a 2M patch

10k used to be standard part at lower speeds. It's a bogus measure of link
budget which is what really matters and is lower for the same rated
distance with each speed increase.

At 4.3dB an LR4 is hardly blasting. While you are fine in rack with
the 1.6dB of FR4, in the average DC with a MMR it is marginal/broken. I'd
prefer they had the old 1G LX's 9dB.

brandon