Q1: What is an OSFP-400G-SR4 Flat Top module?
A: The OSFP-400G-SR4 Flat Top is an OSFP form-factor transceiver supporting 400 Gbps Ethernet over OM4 multimode fiber, using 4 parallel 100 Gbps PAM4 lanes and cooled via a flat-top housing designed to ride on host heatsinks.
Q2: What is the maximum supported transmission distance?
A: Up to 30 m over OM3 and 50 m over OM4, when host-side FEC is enabled.
Q3: What connector and fiber type does it use?
A: Uses a single MPO-12/APC connector over 50/125 µm multimode fiber (OM3/OM4).
Q4: Is the module compatible across different vendor equipment?
A: Yes. It is OSFP MSA-compliant and broadly compatible with OSFP-enabled switches and host cards (e.g., NVIDIA ConnectX-7, Spectrum-4), across brands supporting generic optics.
Q5: Does OSFP-400G-SR4 support hot-swapping?
A: Yes-it is a hot-pluggable module, allowing insertion/removal without shutting down the host device.
Q6: Does it support lane breakout to lower rates?
A: Yes-through use of 1:2 splitter or breakout cables, it can operate in 200 Gb/s mode (activating 2 lanes), reducing power consumption accordingly.
Q7: Does it support diagnostic monitoring (DDM/DOM)?
A: Yes. It supports CMIS/OSFP MSA diagnostics over I²C for optical power, temperature, voltage, and status.
Q8: What is the aggregate and per-lane data rate?
A: Supports up to 425 Gbps aggregate, with four lanes of 106.25 Gbps PAM4 (electrical 400GAUI-4).
Q9: What is the typical power consumption?
A: Typically <8 W, up to 9 W maximum in full 400G mode; drops to ~5-6.5 W when operating at 200G (2 channels).
Q10: What operating temperature range is supported?
A: Standard case temperature range: 0 °C to +70 °C; commercial-grade only.
Q11: Which standards does it comply with?
A: Complies with IEEE 802.3bs (400GBASE-SR4) and OSFP MSA, and supports PAM4, 400GAUI-4, and CMIS (v4.0) protocols.
Q12: How to verify compatibility with equipment?
A: Confirm host supports OSFP optics, CMIS-based modules, and generic flat-top variants (e.g. NVIDIA MMA4Z00-NS400 compatibility). Compatibility testing with major vendors is common.
Q13: What are common use cases for this module?
A: Used for 400 GbE server-to-switch or NIC-to-switch links within high-density data centers (e.g., NVIDIA ConnectX-7, Spectrum-4) over multimode fiber.
Q14: What are typical transmitter/receiver specifications?
A: Typical Tx power per lane: -4.6 to +4.0 dBm; receiver sensitivity ~< -4.6 dBm. Electro-optical link budget supports reliable OM4 link.
Q15: Are flat-top industrial or extended-temperature variants available?
A: Generally standard commercial spec only. Extended-temperature or industrial-grade versions may be offered by some vendors but are less common for flat-top modules.