400G QSFP112 SR4

The 400G QSFP112 SR4 is a 400-Gigabit Ethernet multimode transceiver based on IEEE 802.3cm 400GBASE-SR4.2, delivering cost-effective, high-density links inside data centers. It uses 4×100G PAM4 lanes over bi-directional MMF with two wavelengths per fiber (SR4.2), presented on an MTP/MPO-12 connector (8 fibers active). With a 400GAUI-4 electrical host, it’s ideal for spine/leaf fabrics and short-reach DCI across halls.

• Standards & Management

  • Optical: 400GBASE-SR4.2 (IEEE 802.3cm)

  • Electrical host: 400GAUI-4 (4×106.25 Gbps PAM4, host KP4 FEC)

  • Module mgmt: CMIS 4.0+ with DOM/diagnostics and alarms

• Optics & Reach

  • Wavelengths (per fiber, bi-di): ~850 nm & ~910 nm (SR4.2)

  • Fiber/Connector: OM4/OM5 MMF, MTP/MPO-12

  • Reach: up to 100 m (OM4) / 150 m (OM5)

• Performance & Power

  • Line rate: 400 GbE (4×100G PAM4)

  • Typical module power: ≤ 8 W (platform-dependent)

  • PRBS/loopback support; low BER with host KP4 FEC

• Reliability & Environment

  • Case temperature: 0 to +70 °C (commercial)

  • Laser safety: Class 1 (IEC 60825-1)

  • RoHS/REACH compliant

• Use Cases

  • 400G spine–leaf interconnects over MMF inside/between rows

  • Short-reach campus/CO backbones using existing MMF plant

  • (Platform-dependent) 4×100G breakout to access layers