Q1. What is a QSFP112‑400G‑SR4 module?
A: The QSFP112‑400G‑SR4 is a QSFP112 form‑factor transceiver module delivering 400 Gbps Ethernet over multimode fiber (MMF) at 850 nm, using four parallel PAM4 lanes and an MPO-12 APC connector, compliant with IEEE 802.3db and QSFP112 MSA standards.
Q2. What is the maximum supported transmission distance?
A: Achieves up to 60 m over OM3 and 100 m over OM4 MMF when FEC is enabled on host equipment.
Q3. What connector and fiber type does it use?
A: Uses MPO‑12 APC connector over 50/125 µm multimode fiber (OM3/OM4/MMF).
Q4. Is this module compatible across brands?
A: Yes. Being MSA‑compliant, it’s broadly compatible with platforms by Nvidia/Mellanox, Cisco, Arista, Nvidia etc.
Q5. Does the module support hot‑swapping?
A: Yes. It’s hot-pluggable, allowing insertion/removal without powering down host devices.
Q6. Can it be used in breakout mode?
A: Yes. Supports 2×200G NDR200 mode when used with 1:2 splitter cables, lowering link rate and power. Also supports 4×100G breakout per lane if host supports lane disabling.
Q7. Does it support diagnostic monitoring (DDM/DOM)?
A: Yes. Supports diagnostics via CMIS 5.0 / I²C, showing lane-wise optical power, voltage, temperature, etc.
Q8. What is the aggregate and per‑lane data rate?
A: Operates at ~425 Gbps aggregate, using four 106.25 Gbps PAM4 lanes (53.125 GBd). Electrical interface is 400GAUI‑4 corresponding to IEEE specs.
Q9. What is the typical power consumption?
A: Typical power consumption < 8 W (max ~9 W) at full 400G rate; drops to ~5 W in 200G mode.
Q10. What is the operating temperature range?
A: Designed for commercial case temperature range of 0 °C to 70 °C.
Q11. Which standards does it conform to?
A: Compliant with IEEE 802.3db (400GBASE‑SR4), 400GAUI‑4 interface per IEEE 802.3ck, and QSFP112 MSA standards.
Q12. How can I verify compatibility with my device?
A: Confirm the device supports QSFP112 optics, allows generic modules, and has FEC enabled. Many vendors list part numbers like MMA1Z00‑NS400/SR4.
Q13. What are typical use cases for this module?
A: Designed for 400G data center interconnect, HPC/AI workloads, server-to-switch or switch-to-switch links within racks over MMF.
Q14. What are the optical transmitter/receiver specifications per lane?
A: Tx power: –4.6 dBm to +4.0 dBm; receiver sensitivity (OMA_outer) around –4.6 dBm. Provides sufficient margin for OM4 links up to 100 m.