Q1: What is a QSFP112-400G-DR4 module?
A: The QSFP112-400G-DR4 is a QSFP112-form-factor transceiver supporting 400 Gbps Ethernet over single-mode fiber (SMF) using four parallel PAM4 lanes at ~1310 nm, compliant with IEEE 802.3 and QSFP112 MSA standards.
Q2: What is the maximum supported reach?
A: Supports up to 500 meters over G.652 SMF, provided host-side forward error correction (FEC) like KP4 is enabled.
Q3: What fiber type and connector does it use?
A: Uses MPO-12 APC connector over single-mode 9/125 µm fiber (G.652).
Q4: Is QSFP112-400G-DR4 compatible with equipment from different vendors?
A: Yes. It is MSA-compliant, works with Cisco, ProLabs, FS.com, AsterFusion, Coherent, and others supporting generic QSFP112 optics.
Q5: Does the module support hot-swapping?
A: Yes, it is hot-pluggable, allowing insertion or removal without powering down the host device.
Q6: Can it operate in breakout modes?
A: Yes—supports 4×100G DR1 or 2×200G DR2 breakout modes via host support and compatible cabling.
Q7: Does it include diagnostic monitoring (DDM/DOM)?
A: Yes—supports Digital Optical Monitoring (DOM/DDM) and CMIS (v5.0) diagnostics reporting temperature, voltage, and optical power via I²C.
Q8: What is the aggregate and per-lane rate?
A: The electrical/optical interface supports ~425 Gbps aggregate, using four 106.25 Gbps PAM4 lanes (~53.125 GBd per lane) under 400GAUI-4.
Q9: What is the typical power consumption?
A: Up to 10 W maximum, with many implementations under 8 W depending on vendor and models.
Q10: What is the operating temperature range?
A: Typical case temperature range: 0 °C to 70 °C (commercial grade).
Q11: What standards and protocols apply?
A: Compliant with IEEE 802.3bs / 802.3cu (400GBASE-DR4), QSFP112 MSA, CMIS v5.0, and 400GAUI-4 signaling per IEEE 802.3ck/km.
Q12: How to check compatibility with my device?
A: Confirm your host or switch supports QSFP112 ports, allows third-party optics, and enables FEC. Generic modules tested on >100 platforms have serialized compatibility lists.
Q13: What are typical use cases?
A: Ideal for 400 GbE data center interconnect, HPC/AI compute clusters, spine-leaf links, or breakout into 100G/200G lanes within 500 m SMF span.
Q14: What are the per-lane transmitter/receiver specifications?
A: Typical transmit power: –2.9 dBm (min) to +4.0 dBm (max); receiver sensitivity: around –5.9 dBm. Max insertion loss: ~3 dB per lane for 500 m link margin.
Q15: Are industrial or extended-temperature variants available?
A: Primarily provided in commercial grade. Extended or industrial versions are rare in QSFP112 form factor but may be available upon request.