Optical PMD reference by rate

Every optical Ethernet interface is a PMD (Physical Medium Dependent) defined in IEEE 802.3 or an industry MSA. The tables below list the ones you meet in practice, with fibre type, wavelength, nominal reach and connector — the facts a module's memory must agree with.

1 Gigabit

PMD	Fibre	λ	Reach	Connector
1000BASE-SX	MMF	850 nm	550 m (OM2)	LC
1000BASE-LX	SMF (MMF with MCP)	1310 nm	10 km	LC
1000BASE-EX	SMF	1310 nm	40 km	LC
1000BASE-ZX (MSA)	SMF	1550 nm	80 km	LC
1000BASE-BX-U/D	SMF, single fibre	1310 / 1490 nm	10–20 km	LC simplex

10 Gigabit

PMD	Fibre	λ	Reach	Connector
10GBASE-SR	MMF	850 nm	300 m OM3 / 400 m OM4	LC
10GBASE-LRM	MMF	1310 nm	220 m (legacy OM1/OM2)	LC
10GBASE-LR	SMF	1310 nm	10 km	LC
10GBASE-ER	SMF	1550 nm	40 km	LC
10GBASE-ZR (MSA)	SMF	1550 nm	80 km	LC
10GBASE-BX	SMF, single fibre	1270 / 1330 nm	10–40 km	LC simplex

25 Gigabit

PMD	Fibre	λ	Reach	FEC
25GBASE-SR	MMF	850 nm	70 m OM3 / 100 m OM4	RS-FEC
25GBASE-LR	SMF	1310 nm	10 km	RS-FEC
25GBASE-ER	SMF	1310 nm	40 km	RS-FEC

40 Gigabit (4 lanes)

PMD	Fibre	λ	Reach	Connector
40GBASE-SR4	MMF ×8	850 nm	100 m OM3 / 150 m OM4	MPO-12
40GBASE-LR4	SMF	4 × CWDM (1271–1331)	10 km	LC
40GBASE-ER4	SMF	4 × CWDM	40 km	LC
40G PSM4 (MSA)	SMF ×8	1310 nm	10 km	MPO-12
40G BiDi (vendor)	MMF	2 × 850/900 nm	100–150 m	LC

100 Gigabit

PMD	Lanes	Fibre	λ	Reach	Connector
100GBASE-SR4	4×25G	MMF ×8	850 nm	70 m OM3 / 100 m OM4	MPO-12
100GBASE-SR10	10×10G	MMF ×20	850 nm	100–150 m	MPO-24
100G CWDM4 (MSA)	4×25G	SMF	4 × CWDM	2 km	LC
100G PSM4 (MSA)	4×25G	SMF ×8	1310 nm	500 m	MPO-12
100GBASE-LR4	4×25G	SMF	4 × LAN-WDM (1295–1310)	10 km	LC
100GBASE-ER4	4×25G	SMF	4 × LAN-WDM	40 km	LC
100GBASE-DR	1×100G PAM4	SMF	1310 nm	500 m	LC
100GBASE-FR / LR	1×100G PAM4	SMF	1310 nm	2 km / 10 km	LC

200 and 400 Gigabit

PMD	Lanes	Fibre	Reach	Connector
200GBASE-SR4 / DR4 / FR4 / LR4	4×50G	MMF / SMF	100 m / 500 m / 2 km / 10 km	MPO-12 / LC
400GBASE-SR8	8×50G	MMF ×16	100 m	MPO-16
400GBASE-SR4.2 (BiDi)	4×2×50G	MMF ×8	100 m	MPO-12
400GBASE-DR4	4×100G	SMF ×8	500 m	MPO-12 APC
400GBASE-FR4 / LR4	4×100G	SMF, 4 × CWDM	2 km / 10 km	LC
400GBASE-FR8 / LR8	8×50G	SMF, 8 × LAN-WDM	2 km / 10 km	LC
400ZR (OIF)	coherent	SMF	~120 km	LC

800 Gigabit

PMD	Lanes	Fibre	Reach	Connector
800G-SR8	8×100G	MMF ×16	50–100 m	MPO-16
800G-DR8	8×100G	SMF ×16	500 m	MPO-16 APC
800G 2×FR4	2×(4×100G)	SMF	2 km	dual LC

Reading it against module memory

A module states its PMD through the compliance codes and wavelength bytes in its identity block (SFF-8472 for SFP-class, SFF-8636/CMIS for QSFP-class), using values from SFF-8024. The Check transceiver screen decodes these so you can confirm a module is the PMD its label claims — and when recoding, keep the codes consistent with the real optics (an SR module coded as LR will not reach 10 km).