In fact I need to connect two remote sites about 14km over a single strand of single mode fiber, reason why I need a bi-directional SFP. Generally SFP (FPS) uses two fibers (one RX and TX), but whith Bidirectional SFP we use one fiber.
i find Bidirectional SFP compatible with Cisco 2911 .
1000BASE-BX40-D and 1000BASE-BX40-U for Single-Fiber Bidirectional Applications
The Cisco GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs operate on a single strand of standard SMF.
A GLC-BX40-D-I or GLC-BX40-DA-I device connects to a GLC-BX40-U-I device with a single strand of standard SMF with an operating transmission range up to 40 km.
The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two devices. The GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs also support 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.
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