FN-TRAN-LX-BCC | Fortinet Compatible 1GB Single-Mode 10km (1000BASE-LX)

Q: Will this work in place of the Fortinet FN-TRAN-LX?
A: Yes. The FN-TRAN-LX-BCC delivers the same 1.25 Gbps data rate over single-mode fibre using the same 1310nm wavelength and SFP form factor as the Fortinet FN-TRAN-LX. It is IEEE 802.3z 1000BASE-LX compliant and plug-and-play compatible with Fortinet equipment that specifies the FN-TRAN-LX.

Q: Which Fortinet platforms support this transceiver?
A: This transceiver works in any Fortinet system with SFP or SFP/SFP+ slots. This includes FortiGate firewall models, FortiSwitch access and data centre switches, and FortiSandbox appliances. If your Fortinet device has an SFP port and lists FN-TRAN-LX in its datasheet, this module is compatible.

Q: What fibre type and link budget does this transceiver require?
A: This transceiver requires standard single-mode fibre (9/125 micron G.652). It transmits at 1310nm and is specified for up to 10km reach with a duplex LC connection. The actual achievable distance depends on total link loss, including fibre attenuation, splice loss, and connector loss. The transceiver includes sufficient power budget for typical enterprise and service provider links within the 10km specification.

Q: Can I monitor the optical power levels on this transceiver?
A: Yes. This transceiver includes Digital Diagnostic Monitoring (DDM) support per SFF-8472. The host system can read real-time transmit power, receive power, supply voltage, laser bias current, and module temperature via the I2C interface. Most Fortinet network operating systems expose these parameters through CLI or web interface for link troubleshooting and preventive maintenance.

Q: What is the difference between 1000BASE-LX and 1000BASE-SX for my application?
A: 1000BASE-LX uses 1310nm wavelength over single-mode fibre and reaches up to 10km, while 1000BASE-SX uses 850nm over multi-mode fibre and is limited to 220m to 550m depending on fibre grade (OM1, OM2, OM3). Use LX transceivers for campus backbone links, building-to-building interconnects, or any link requiring distances beyond 550m. Use SX for short intra-rack or intra-building links where multi-mode infrastructure is already installed.