SFP GPON C++ ZTE, 2.5/1.25G, SM SC, 34dB, TX1490/RX1310, DDM (Class C++)

OPTEC GPON C++ SFP, 2.5/1.25G, SM SC, 34dB, TX1490/RX1310, DDM (Class C++) 

DDM - Digital Diagnostic Monitor (compatible with Cisco DOM – Digital Optical Monitoring). This function enables monitoring of key module operating parameters such as transmitted optical signal power, received optical signal power, operating temperature, supply voltage, and laser current.
Using DDM helps prevent failures and speeds up the diagnosis of problems with the optical network. Operating parameters can only be monitored by devices with an implemented digital diagnostics readout function.