Q: Will this work in place of the Cisco QSFP-40G-LR4?
A: Yes. The QSFP-40G-LR4-BCC is a plug-and-play replacement for the Cisco QSFP-40G-LR4, sharing the same QSFP+ form factor, 40GBASE-LR4 standard compliance, and 10 km reach over single-mode fibre. It is fully compatible with Cisco QSFP+ ports supporting 40 Gigabit Ethernet.

Q: Which Cisco platforms support this transceiver?
A: This module works in any Cisco platform with a QSFP+ port supporting 40GBASE-LR4 interfaces. Confirm your switch or router supports QSFP+ form factor transceivers and 40 Gigabit Ethernet data rates. The module is coded for Cisco compatibility.

Q: What fibre type and specifications are required to achieve 10 km reach?
A: The module requires G.652 single-mode fibre with duplex LC connectors. Actual reach depends on fibre attenuation, splice and connector losses, and total link budget. The 40GBASE-LR4 standard specifies a minimum link budget to support 10 km under typical deployment conditions.

Q: How does the four-lane CWDM wavelength architecture work?
A: The transceiver converts four 10.3125 Gbps electrical lanes into four optical signals at distinct CWDM wavelengths (1271, 1291, 1311, 1331 nm). An internal multiplexer combines these onto a single transmit fibre. At the receiver, a demultiplexer separates the wavelengths back into four electrical lanes. This architecture enables 40 Gbps transmission over a single duplex fibre pair instead of requiring parallel ribbon fibre.

Q: Can this module support OTU3 or STM-256 applications in addition to 40 Gigabit Ethernet?
A: This module is optimised for IEEE 802.3ba 40GBASE-LR4 Ethernet applications. If your deployment requires OTU3 (43.018 Gbps) or other telecom data rates, confirm your specific host platform and line card support those signal types with this transceiver before deployment.