40G QSFP+ to 4X SFP+ Active Optical CableDescription 40G QSFP+ to 4x SFP+ Active Optical Cable The product's direct attach optical cables are based on the 10G and 40G Ethernet IEEE 802. 3ae standard, support 4 lanes of 10Gbs (40Gbs composite), and are programmed to be fully compatible and functional with its brand's own designated switching devices. These cables use multimode fiber carrying a 850nm nominal wavelength. The active optical QSFP+ cable is a lightweight with a small diameter.