Hi nanog. Does anyone know distance support range about gigabit ethernet in IEEE 802.3z and 802.3ab and SONET/SDH? Gigabit Ethernet SX Transceiver : ? km LX Transceiver : ? km Long Haul Transceiver : ? km SONET/SDH MM(Multimode) : ? SR(Short reach) : ? IR(Intermediate reach) : ? LR(Long reach) : ? thanks for any input or pointer. Brian