The Cisco SFP-10G-BXD-I-RF SFPs operate on a single strand of standard SMF. The communication over a single strand of fiber is achieved by separating the transmission wavelength of two devices. The SFP-10G-BXD-I-RF transmits a 1330-nm channel and receives a 1270-nm signal. The SFP-10G-BXD-I-RF SFPs also support Digital Optical Monitoring (DOM) functions. 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.