155 MB/S SINGLE MODE FIBER OPTIC TRANSCEIVER FOR ATM, sonet OC-3/SDH STM-1 HFCT-5805A · 155 Mb/s SMF (15km) 1x9 3.3V Transceiver for ATM, sonet OC-3 -40C to 85C Black Case HFCT-5805B · 155 Mb/s SMF (15km) 1x9 3.3V Transceiver for ATM, sonet OC-3 0C to 70C Black Case HFCT-5805C · 155 Mb/s SMF (15km) 1x9 3.3V Transceiver for ATM, sonet OC-3 -40C to 85C Blue Case HFCT-5805D · 155 Mb/s SMF (15km) 1x9 3.3V Transceiver for ATM, sonet OC-3 0C to 70C Blue Case