Siemens 6GK5992-1AQ00-8AA0 SFP transceiver. Siemens 6GK5992-1AQ00-8AA0 is an SFP transceiver in the SCALANCE Industrial Ethernet range. Siemens’ exact-order-number description: SCALANCE X accessory, Plug-in transceiver SFP992-1ELH 1x 1000 Mbit/s LC port, optical single-mode up to max.