The 400G overview
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).
Abbreviations:
PSM = Parallel Singlemode
CWDM = Coarse Wavelength Division Multiplex
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 | 1271, 1291, 1311, 1330nm | 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