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The 400G overview

IEEE P802.3bs

The table below describes the IEEE Application Acronyms for 400G.

Please note that for formfactor QSFP-DD and OSFP the electrical interface will always operate at 8 x 50G (PAM4).

acronym optical lanes speed per optical lane distance wavelength comment
DR 1 100G (PAM4) 500m 1310nm used for 100G QSFP28 with single lambda working at 112G
DR4 4 100G (PAM4) 500m 1310nm PSM, breakout with DR possible
DR4+ 4 100G (PAM4) 2km 1310nm PSM, DR4+ is not a IEEE acronym
FR4 4 100G (PAM4) 2km 1270, 1290, 1310, 1330nm CWDM, no breakout mode
FR8 8 50G (PAM4) 2km 1270, 1290, 1310, 1330nm June 2018: haven't seen on any QSFP-DD and OSFP roadmap
LR4 4 100G (PAM4) 10km 1295, 1300, 1305, 1310nm no breakout mode
LR8 8 50G (PAM4) 10km 1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309nm June 2018: haven't seen on any QSFP-DD and OSFP roadmap
SR4 2xBIDI 8 50G (PAM4) 100m 850/910nm 400G with MPO12 (instead MPO16). MPO12 is used for 100G SR4 and 40G SR4
SR8 8 50G (PAM4) 100m 850nm MPO16 required


PSM = Parallel Singlemode
CWDM = Coarse Wavelength Division Multiplex


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