SFP-10G-BX40U-I-BCC | Cisco Compatible 10G Single-Mode 40km (10GBASE-BX40U)

Q: Will this work in place of the Cisco SFP-10G-BX40U-I?
A: Yes. The SFP-10G-BX40U-I-BCC is designed as a plug-and-play replacement for the Cisco SFP-10G-BX40U-I. It matches the same 10GBASE-BX40-U standard, SFP+ form factor, 1270nm TX / 1330nm RX wavelength pair, 10 Gbps data rate, and 40km reach specification. Insert it into any SFP+ port where the Cisco reference SKU is specified.

Q: Which Cisco platforms support this transceiver?
A: This transceiver works in any Cisco switch, router, or appliance with an SFP+ port that supports 10GBASE-BX operation. Compatibility is determined by the host port supporting the 10GBASE-BX standard and SFP+ form factor, not by a specific model list. Consult your platform documentation to confirm 10GBASE-BX support on the intended port.

Q: Why must I pair this upstream unit with a downstream transceiver?
A: BiDi transceivers achieve bidirectional communication over a single fibre strand by using complementary wavelength pairs. The SFP-10G-BX40U-I upstream unit transmits at 1270nm and receives at 1330nm. It must connect to a downstream unit (such as SFP-10G-BX40D-I) that transmits 1330nm and receives 1270nm. Connecting two upstream or two downstream units will not establish a link because their wavelengths do not align.

Q: What fibre type and quality are required for 40km reach?
A: This transceiver requires OS2 single-mode fibre (G.652 standard) with clean simplex LC terminations. Actual reach depends on fibre attenuation, splice loss, connector insertion loss, and patch panel count. The module provides a 16 dB optical power budget. If your link budget exceeds this due to long distance or high loss, measure end-to-end attenuation and verify it stays within the transceiver transmit power and receiver sensitivity window.

Q: Can I monitor link health and optical parameters in real time?
A: Yes. This transceiver supports Digital Optical Monitoring (DOM) per SFF-8472. Your switch or NOS can query real-time transmit power, receive power, module temperature, laser bias current, and supply voltage over the I2C management interface. Use these parameters to detect degrading fibre, failing lasers, or thermal issues before they cause link failure. DOM thresholds are factory-programmed and accessible via standard commands.