Cisco Compatible GLC-BX-U-40K – 1000BASE-BX-U BiDi SFP Transceiver (Tx1310nm/Rx1490nm) 40km, LC Simplex

Enhance your Cisco network with a high‑quality, OEM‑compatible GLC-BX-U-40K SFP transceiver from ENET. This module is functionally identical to Cisco’s GLC-BX-U, delivering dependable 1 Gbps fiber connectivity over a single fiber strand using BiDi technology. With a long reach of up to 40 kilometers and an LC simplex connector, it’s designed for enterprise, data center, and campus environments where performance, compatibility, and cost‑efficiency matter. Plug‑and‑play ready, this transceiver integrates smoothly into Cisco switches, routers, and other 1000BASE‑X devices while offering a cost‑effective alternative without sacrificing reliability or functionality.

• BiDi design for streamlined fiber deployment: This GLC-BX-U-40K operates as a bidirectional transceiver, transmitting at 1310 nm and receiving at 1490 nm on a single optical fiber. By combining both directions over one fiber strand, it reduces fiber plant requirements, simplifies cable management, and lowers installation costs—without compromising full‑duplex 1 Gbps performance.
• Long reach up to 40 km on single‑mode fiber: Engineered for mid‑to‑long haul links, the module supports distances up to 40 kilometers when paired with appropriate single‑mode fiber. This makes it ideal for campus interconnects, data‑center uplinks, and building‑to‑building connections, delivering stable performance over extended runs.
• Cisco‑compatible, OEM‑equivalent reliability: The ENET‑equivalent GLC‑BX‑U‑40K is designed to be functionally identical to Cisco’s own module, with a 100% compatibility guarantee for Cisco switches, routers, and other 1000BASE‑X devices. It provides the same electrical, optical, and interoperability behavior you expect from an OEM module, backed by robust testing and certification processes.
• Cost‑effective, high‑value solution: ENET’s OEM‑compatible optics deliver substantial savings compared with OEM pricing while maintaining full functionality and compatibility. This supports scalable deployments across growing networks, offering value without compromising reliability or support.
• Easy installation and strong support: As a hot‑pluggable SFP module, the GLC-BX-U-40K installs quickly into standard SFP ports. It’s paired with dependable technical support and documentation to help administrators deploy, test, and monitor links with confidence, minimizing downtime and expediting maintenance.

Technical Details of Cisco Compatible GLC-BX-U-40K

• Type: 1000BASE‑BX‑U SFP BiDi transceiver
• Wavelengths: Tx1310nm / Rx1490nm
• Distance: Up to 40 km on single‑mode fiber
• Connector: LC simplex
• Data Rate: 1.25 Gbps (1000BASE‑X standard)
• Fiber Type: Single‑mode optical fiber
• Compatibility: Cisco‑compatible and ENET OEM‑equivalent; designed for interoperability with 1000BASE‑X devices

How to Install Cisco Compatible GLC-BX-U-40K

• Identify an available SFP port on the Cisco device and ensure the port is powered or powered down per your maintenance policy. The module is hot‑pluggable, so it can be inserted into a powered device in most environments.
• Insert the GLC‑BX‑U‑40K into the SFP port until it seats with a firm click. If your chassis has a locking mechanism, secure the module as required.
• Connect a single‑mode fiber patch cable with LC simplex connectors between the SFP module and the corresponding port on the partner device. Ensure Tx on one end aligns with Rx on the other end to support BiDi operation.
• Power up the equipment or confirm the port is active, then verify link status on both ends. The link indicators should illuminate, and the port should report a stable 1 Gbps connection across the 40 km link where applicable.
• Optional verification: Access the device’s management interface to view transceiver information (such as basic optical parameters and link status) and monitor link health and uptime. If supported by your network management tools, enable DOM or interface counters to track performance over time.

Frequently Asked Questions

• What is the GLC-BX-U-40K? It is a Cisco‑compatible 1000BASE‑BX‑U BiDi SFP transceiver with a 40 km reach on single‑mode fiber, using 1310 nm transmit and 1490 nm receive wavelengths in an LC simplex package.
• Is this module compatible with Cisco gear? Yes. The GLC‑BX‑U‑40K is designed to be functionally identical to Cisco’s GLC‑BX‑U and is backed by a guarantee of compatibility with Cisco switches, routers, and other 1000BASE‑X devices when used within supported configurations.
• What type of fiber and connectors do I need? You’ll need single‑mode fiber with LC simplex connectors. Ensure proper orientation for BiDi operation (Tx/Rx alignment) to achieve the expected 40 km reach.
• Do I need any special configuration? In most cases, no. This transceiver is designed for plug‑and‑play use in supported SFP ports. Some devices may require enabling the interface or confirming link settings after installation.
• What performance should I expect? The module supports 1 Gbps Ethernet over single‑mode fiber up to 40 kilometers, aligning with the 1000BASE‑BX‑U standard and the bidirectional 1310 nm/1490 nm wavelength pairing.