The 1417G5 and 1417H5 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 1417G5 operates at the OC-3/STM-1 rate of 155 Mbits/s, and the 1417H5 operates at the OC-12/ STM-4 rate of 622 Mbits/s. The transceiver features Agere Systems high-reliability optics and is packaged in a narrow-width plastic housing with an LC duplex receptacle. This receptacle fits into an RJ-45 form factor outline. The 20-pin package and pinout conform to a multisource transceiver agreement. The transmitter features differential PECL logic level data inputs and a LVTTL logic level disable input. The receiver features differential PECL logic level data and clock outputs and a LVTTL logic level signaldetect output.