2-Port GE IOA: supports up to (2) pluggable SFP adapters (RX-550M-SFP, RX-10KM-SFP, RX-70KM-SFP). Works with the GE/FE-8 and ERX-GEFE256M-MOD line modules and requires the purchase of at least (1) pluggable SFP adapter per IOA, (2) SFP adapters per IOA for a redundant (APS-like) configuration.