Q1. What is a QSFP28‑100G‑DR module?
A: The QSFP28‑100G‑DR (Digital Reach) is a QSFP28 transceiver module that delivers 100 Gbps Ethernet over single-mode fiber (SMF) using a single 1310 nm PAM4 wavelength with duplex LC connectors, compliant with IEEE 100GBASE‑DR specifications.
Q2. What is its maximum supported reach?
A: Supports up to 500 m over G.652 SMF, requiring host‑side RS‑FEC per IEEE 802.3cd.
Q3. What fiber and connector does it use?
A: Uses duplex LC connectors over single-mode 9/125 µm fiber (G.652).
Q4. Is QSFP28‑100G‑DR compatible across multiple brands?
A: Yes. It is MSA‑compliant and works with Cisco, Juniper, Huawei, Arista etc., assuming generic optics are permitted by the host system.
Q5. Is the module hot‑swappable?
A: Yes. As a QSFP28 form factor, it supports hot-plug insertion/removal without interruption.
Q6. Does it support diagnostic monitoring (DDM/DOM)?
A: Yes. It includes digital diagnostic monitoring (SFF‑8472) for temperature, optical power, voltage, and status via I²C interface.
Q7. What is the optical modulation and baud rate?
A: Uses PAM4 modulation at 53.125 GBd sending a single-lambda 100G signal, converting 4×25 Gbps NRZ electrical lanes into a single optical stream.
Q8. What is the typical power consumption?
A: Typical power consumption is up to ~4.5 W, depending on vendor implementation.
Q9. What operating temperature ranges are supported?
A: Standard commercial modules support 0 °C to 70 °C. Industrial or extended versions may support broader ranges if specified.
Q10. Which IEEE and MSA standards does it comply with?
A: Complies with IEEE 802.3cd (100GBASE‑DR), QSFP28 MSA, SFF‑8636, SFF‑8665, and Single Lambda MSA.
Q11. How can I check compatibility with my device?
A: Ensure your switch or NIC supports generic 100GBASE‑DR optics and allows third-party modules; many vendors (e.g., Cisco, Huawei) include DR‑coded EEPROM for compatibility.
Q12. What are typical application scenarios?
A: Ideal for 100G connectivity within data centers, high-performance computing clusters, single-wavelength breakout from 400G to 100G, and short SMF interconnects up to 500 m.
Q13. Can QSFP28‑100G‑DR interoperate with 400G DR4 optics?
A: Yes. It supports interoperability with IEEE 400GBASE‑DR4 transceivers via appropriate fiber breakout cables.
Q14. What is the optical link budget per lane?
A: Optical budget is typically ~3 dB, sufficient for reliable 500 m link over SMF G.652 with margins.
Q15. Are extended‑range or industrial variants available?
A: QSFP28‑100G‑DR modules are primarily for short-reach; industrial-temperature versions exist. For longer reach, alternatives like LR4, FR, ER variants support 10 km–40 km distances