Q1. What is a QSFP28‑100G‑LR4 module?
A: The QSFP28‑100G‑LR4 is a QSFP28 form‑factor transceiver supporting 100 Gbps Ethernet over single‑mode fiber (SMF), using four LAN‑WDM lanes at 1310 nm and duplex LC connectors.
Q2. What is the maximum supported transmission distance?
A: Supports up to 10 km over standard G.652 SMF; some engineered variants reach 10 km or slightly beyond depending on fiber quality and FEC support.
Q3. What connector and fiber type are used?
A: Uses duplex LC connectors over 9/125 µm single-mode fiber (SMF).
Q4. Is QSFP28‑100G‑LR4 compatible with various brands?
A: Yes—it's MSA-compliant and broadly compatible with Cisco, Arista, Juniper, Huawei, Ciena, FS.com, controlled vendors, and generic optics providers.
Q5. Does the module support hot-swapping?
A: Yes. As a QSFP28 module, it is hot-pluggable, allowing insertion/removal without powering down the host system.
Q6. Does it support diagnostic monitoring (DDM/DOM)?
A: Yes. It includes Digital Diagnostic Monitoring (DDM/DOM) via I²C, supporting real‑time monitoring of temperature, voltage, optical power, etc.
Q7. What is the aggregate and per-lane data rate?
A: Operates at up to 103.125 Gbps aggregate, with each of the four lanes at ~25.78125 Gbps (some modules support 112 Gbps electrical rate).
Q8. What is the typical power consumption?
A: Typical power consumption is under 3.5 W (often around 3.5 W, some vendor versions slightly lower).
Q9. What is the operating temperature range?
A: Standard commercial range: 0°C to 70°C; extended: –5°C to +70°C; industrial-grade: –40°C to +85°C.
Q10. Which IEEE and MSA standards does it conform to?
A: Complies with IEEE 802.3ba 100GBASE‑LR4, QSFP28 MSA (SFF‑8665/8436), and diagnostic standard SFF‑8472.
Q11. How to verify compatibility with my network device?
A: Confirm your device supports 100GBASE‑LR4 QSFP28 optics and allows third-party modules. Many vendors encode part numbers for compatibility on platforms like Cisco, Juniper, Ciena, etc.
Q12. What are typical use cases for QSFP28‑100G‑LR4?
A: Ideal for data center inter-rack links, long‑distance campus or metro backbone links, telecom aggregation, and enterprise or carrier-grade long-reach SMF connections up to 10 km.
Q13. What is the optical transmit and receive power budget per lane?
A: Typical lane Tx power: –1.3 to +4.5 dBm; Rx sensitivity: –8.6 to +2.4 dBm, providing sufficient optical budget for ~10 km links.
Q14. Are there industrial or extended variants available for harsh environments?
A: Yes. Some versions such as LR4‑I support industrial temperature ranges (–40 °C to +85 °C) and optimized robustness/performance for demanding environments.