The 2417G4A and 2417H4A transceivers are highspeed, cost-effective optical transceivers that are compliant with the International Telecommunication Union Telecommunication (ITU-T) G.957 specifications for use in ATM, SONET, and SDH applications. The 2417G4A operates at the OC-3/STM-1 rate of 155 Mbits/s, and the 2417H4A operates at the OC12/STM-4 rate of 622 Mbits/s. The transceivers feature Agere Systems high-reliability optics and are packaged in a narrow-width plastic housing with an LC duplex receptacle. This receptacle fits into an RJ-45 form-factor outline. The 10-pin package and pinout conform to a multisource transceiver agreement. The transmitter features differential LVPECL logic level data inputs and an LVTTL logic level disable input. The receiver features differential LVPECL logic level data and an LVPECL logic level signal-detect output for the 2417G4A, and a LVTTL logic level signal-detect output for the 2417H4A.