GLC-BX40-DA-I= - Cisco Single-mode 1Gbps 1000Base-BX-D Fiber 40km 1490nmTX/1310nmRX LC Connector SFP Transceiver Module

The Cisco GLC-BX40-DA-I SFP operates on a single strand of standard SMF.The GLC-BX40-DA-I SFP also supports digital optical monitoring (DOM) functions according to the industry-standard SFF-8472 multisource agreement (MSA). This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage.