GLC-BX40-U-I-BCC | Cisco Compatible 1GB Single-Mode 40km (1000BASE-BX40-U) Industrial

Q: Will this work in place of the Cisco GLC-BX40-U-I?
A: Yes. The GLC-BX40-U-I-BCC is a plug-and-play replacement that matches the Cisco GLC-BX40-U-I in form factor (SFP), data rate (1.25Gbps), standard (1000BASE-BX40-U), wavelength pairing (1310nm TX / 1550nm RX), reach (40km), and industrial temperature rating (-40°C to +85°C). It will initialise and operate identically in any Cisco platform with a compatible SFP slot.

Q: Which Cisco platforms support this industrial BiDi SFP?
A: This module is compatible with Cisco industrial Ethernet switches, routers, and media converters that support SFP ports and operate within the industrial temperature range. It works in any Cisco device with an MSA-compliant SFP slot that accepts 1000BASE-BX modules. Verify your platform supports BiDi upstream modules and industrial temperature operation if deploying in harsh environments.

Q: Why does this module require a matching downstream transceiver?
A: BiDi transceivers transmit and receive on different wavelengths over a single fibre strand. This upstream (U) module transmits at 1310nm and receives at 1550nm. It must connect to a downstream (D) module that transmits at 1550nm and receives at 1310nm (such as the GLC-BX40-D-I). The integrated WDM diplexer in each module splits the wavelengths, enabling bidirectional communication. Two upstream modules cannot communicate with each other.

Q: What fibre type and distance limitations apply to the 40km reach specification?
A: The 40km maximum reach applies to standard ITU-T G.652 single-mode fibre (9/125µm SMF) under typical conditions with a 22dB minimum optical budget. Actual distance depends on fibre attenuation, splice loss, connector loss, and any inline components. For links shorter than 10km, an optical attenuator may be required to prevent receiver saturation. OM3 and OM4 multimode fibres are not supported.

Q: Does this industrial-rated module support the same DOM parameters as commercial-temperature SFPs?
A: Yes. DOM functionality per SFF-8472 is fully supported across the entire industrial temperature range (-40°C to +85°C). You can monitor transmit optical power, receive optical power, module temperature, laser bias current, and supply voltage in real time via compatible network operating systems or management platforms. All parameters remain accurate and accessible even at temperature extremes.