The CT2 Series SFP transceiver provides a fully SONET compliant interface between the SONET/SDH photonic layer and the electrical layer. Its microprocessor-based modular design implements all features specified in the SFP MSA compatible 2-wire Serial Digital Diagnostic Monitoring Interface for Optical Transceivers. They are available at all the rates from OC-3 to OC-48 (SFP) and OC-192 (XFP) as well as all the reaches from SR1 to LR2, CWDM and DWDM.