SFP+ Cables are available in lengths up to 12m

Physical layer modules are not specified in an official standards body but by multi-source agreements (MSAs) that can be negotiated more quickly. Relevant MSAs for 10GbE include XENPAK (and related X2 and XPAK), XFP and SFP+ Cables. When choosing a PHY module, a designer considers cost, reach, media type, power consumption, and size (form factor). A single point-to-point link can have different MSA pluggable formats on either end (e.g. XPAK and SFP+) as long as the 10GbE optical or copper port type (e.g. 10GBASE-SR) inside the pluggable is identical.Optical modules are connected to a host by either a XAUI, XFI or SFI interface. XENPAK, X2, and XPAK modules use XAUI to connect to their hosts. XAUI (XGXS) uses a four-lane data channel and is specified in IEEE 802.3 Clause 48. XFP modules use a XFI interface and SFP+ Cables use an SFI interface. XFI and SFI use a single lane data channel and the 64b/66b encoding specified in IEEE 802.3 Clause 49.SFP+ Cables can further be grouped into two types of host interfaces: linear or limiting. Limiting modules are preferred except when using old fiber infrastructure which requires GLC-LH-SMD​,Compatibl​e Cisco SFP Transceive​r 1000Base-L​X SFP 1310nm 20KM with DDM the use of the linear interface provided by 10GBASE-LRM modules Also known as Direct Attach (DA), 10GSFP+Cu, 10GBASE-CR,[25] 10GBASE-CX1, SFP+, or 10GbE Cu SFP+ Cables.