Q1. What is a QSFP‑40G‑LR4 module?
A: The QSFP‑40G‑LR4 is a QSFP+ transceiver supporting 40 Gbps Ethernet over single‑mode fiber (SMF), using four CWDM lanes at 1270–1330 nm with duplex LC connectors.
Q2. What is the maximum transmission distance supported?
A: Supports up to 10 km over G.652 SMF; some variants support up to 20 km with higher optical budgets.
Q3. What connector and fiber type does it use?
A: Uses a duplex LC connector over 9/125 µm single-mode fiber (SMF).
Q4. Is QSFP‑40G‑LR4 compatible across major brands?
A: Yes. It is MSA-compliant and broadly compatible with Cisco, Arista, Juniper, Huawei, Dell, ProLabs, Optcore, FS.com, QSFPTEK, etc.
Q5. Does the module support hot‑swapping?
A: Yes. QSFP‑40G‑LR4 is hot-pluggable, allowing removal or insertion without powering down the device.
Q6. Can it be used in 4×10G breakout mode?
A: Yes. Many implementations (e.g., QSFP‑4X10G-LR-S) support 4×10G breakout, interoperable with SFP‑10G‑LR ports up to 10 km.
Q7. Does it support Digital Diagnostic Monitoring (DDM/DOM)?
A: Yes. It supports SFF-8436 and SFF‑8472 diagnostic monitoring for optical power, temperature, voltage, etc.
Q8. What is the typical power consumption?
A: Typically around 3.5 W, though some vendors produce versions under 2.5 W.
Q9. What operating temperature ranges are supported?
A: Standard commercial: 0 °C to 70 °C. Extended versions: –5 °C to +85 °C or –40 °C to +85 °C.
Q10. Which IEEE/MSA standards apply?
A: Compliant with IEEE 802.3ba (40GBASE‑LR4) and QSFP+ MSA SFF‑8436, with diagnostic per SFF‑8472.
Q11. How to verify compatibility with my equipment?
A: Check that your device supports generic QSFP+ LR4 optics and allows third-party modules. Many are preprogrammed for Cisco, Juniper, Arista platforms.
Q12. What are typical use cases for QSFP‑40G‑LR4?
A: Common in data centre interconnects, spine‑leaf architectures, long‑reach campus or metro links, and carrier networks.
Q13. Are extended-reach variants available?
A: Yes. Some versions support 20 km reach (e.g. LR4-20) over SMF at higher optical budgets.
Q14. What is the module’s physical size and interface?
A: Typical dimension ~13.5 × 18.4 × 72.4 mm, consuming 3.5 W, using QSFP+ electrical interface (38‑pin) and LC optical connector.