Finisar FWLF1523P1x51 Small Form Factor Pluggable (SFP) transceivers provide a reliable solution for 1511nm, point-to-point, 155Mb/s Optical Supervisory Channel (OSC) applications, outside the band of the transmitted signal. 1550nm 80km ZX 155 MB Modules are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA), as well as with SONET and SDH standards at OC-3 LR-2/STM L-1.2 and Fast Ethernet applications. Digital diagnostics functions are available via the 2-wire serial bus specified in the SFP MSA. 155M ZX SFP Modules are RoHS compliant and lead-free per Directive 2011/65/EU and Finisar Application Note AN-2038.