The Model OTOLS-BIYY-ZZ small form pluggable (SFP) bidirectional transceiver operates at 1.25Gb/s and is compatible with gigabit Ethernet and 1000BASE-T standards. The link uses a two-wire serial communication protocol based on current industry requirements. The compact metallic enclosure includes a standard SC/UPC connector. The transceiver uses 1310nm, 1490nm, or 1550nm for transmission in one direction and 1310nm, 1490nm, or 1550nm for transmission in the other direction. The transceiver may be used for bidirectional data links up to 1.25GB/s over single-mode fiber. All SFP modules now include Digital Diagnostic Monitoring (DDM).