HFCT-5205D · 155 Mb/s SMF Transceiver for sonet/sdh OC-3/sdh STM-1 0C to 70C Blue Case HFCT-5205C · 155 Mb/s SMF Transceiver for sonet/sdh OC-3/sdh STM-1 -40C to 85C Blue Case HFCT-5205B · 155 Mb/s SMF Transceiver for sonet/sdh OC-3/sdh STM-1 0C to 70C Black Case FIBER OPTIC TRANSCEIVER,M:ML040MW025 From old datasheet system SC Duplex Single Mode Transceiver 155 Mb/s Single Mode Fiber Transceiver for sonet/sdh OC-3/sdh STM-1 0C to 70C Black Case