QSFP112400G·since 2022 (QSFP112 MSA), 2024 (broad platform availability)

QSFP112: 400G in a QSFP envelope — four lanes of 100G PAM4.

QSFP112 (QSFP MSA, IEEE 802.3ck / 802.3cu). Four electrical lanes at 100 Gbps PAM4 — same 4-lane topology as QSFP28 and QSFP56, scaled to 100G per lane. CMIS-based management. The primary 400G form factor for new data-center fabric and the natural migration target for QSFP28-capable platforms. QSFP-DD800 is an alternative 8-lane 400G/800G form factor on select hyperscale platforms (see notes).

Specifications

MSA references

QSFP-MSA rev 5.x (mechanical) · CMIS 4.0 / 5.0 (management) · IEEE 802.3ck (PAM4 SerDes)

Electrical interface

4 lanes × 53.125 Gbaud PAM4 (100G per lane)

Power consumption

8 W – 14 W typical; up to 18 W for coherent ZR / ZR+ variants

Signalling

PAM4 with KP4 / RS-FEC

FEC

RS-FEC (544,514) required

Connector types

MPO-12 (DR4, FR4) · LC duplex (LR4, ER4) · QSFP112 DAC / AOC

Available SKUs

Part number	Spec	Wavelength	Fiber	Reach	Notes
`NAP-QSFP112-DR4`	400GBASE-DR4	1310 nm	SM parallel	500 m	MPO-12, 4×100G PAM4
`NAP-QSFP112-FR4`	400GBASE-FR4	LAN-WDM	SM	2 km	LC duplex
`NAP-QSFP112-LR4`	400GBASE-LR4	LAN-WDM	SM	10 km	LC duplex
`NAP-QSFP112-ER4`	400GBASE-ER4	LAN-WDM	SM	40 km	SOA-based
`NAP-QSFP112-400ZR`	400G coherent ZR	C-band	SM	80–120 km	OIF 400ZR, DSP-based
`NAP-QSFP112-400ZR-PLUS`	400G ZR+ (OpenZR+)	C-band	SM	500–1000 km+	Carrier-grade DCI
`NAP-QSFP112-BREAKOUT`	400G → 4×100G DR	1310 nm	SM parallel	500 m	Standard fabric breakout

In production with

QSFP112 modules are deployed across these platforms today. Full coding details are on the compatibility matrix.

Cisco Nexus 9300-GX/GX2, 9408, Silicon One platforms
Juniper QFX5130, QFX5220, QFX5240, MX10K
Arista 7060X5, 7280R3, 7500R3, 7800R3, 7060X6
Dell Z9332F, Z9432F, S5448F
Aruba CX 9300, 10000
NVIDIA Spectrum-4 (SN5000 series)

Operational notes

QSFP112 uses the same mechanical envelope as QSFP28 but requires a host with 100G PAM4-capable SerDes — older QSFP28 cages will not accept QSFP112 modules at 400G.

400ZR and 400ZR+ modules can draw 15–18 W. Verify chassis per-port power budget before populating every cage with coherent optics.

PAM4 sensitivity to dirty connectors is real — 400G installs warrant a fiber scope and a click-cleaner per port.

NetAPI also sells the 400G QSFP-DD form factor (8-lane variant) — pick QSFP-DD if your switch has QSFP-DD cages or you need migration headroom toward QSFP-DD800.

Recommended for

Modern data-center fabric (spine, leaf, ToR aggregation)
AI/ML training cluster east-west traffic (400G RoCE)
Hyperscale spine-spine links
Coherent DCI for metro and long-haul (400ZR / ZR+)

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