The 10G SFP + CU media type is not specified in the 802.3 standard, and the shorthand identifier was invented by the vendors who developed this cable type. This low-cost short copper cable segment is useful, for example, for interconnecting a stack of switches, and for short-distance connections between switch ports and Ethernet interfaces on servers and other devices. Prior to the development of 10GBase-T, this direct attach cable (also referred to as a DA or DAC) was the only low-cost copper connection available for 10 Gb/s operation.
The direct attach cable is terminated with a SFF connector module called the SFP+ (small form-factor pluggable plus). The SFP+ transceiver module fits into a port that is roughly the size of an RJ45-style port, making it possible for vendors to provide a higher port density on their switches.
The SFP+ module is not standardized by any official standard body, but instead is specified by a multisource agreement (MSA) that was developed among competing manufactures. Multisource agreements are the primary method used to develop communications connectors and transceiver modules that are used in Ethernet and other network systems. As technology advances, cabling and equipment vendors work together to develop smaller and more efficient connectors and modules, using the MSA as a rapid method of developing these enhancements. The SFP+ is the second generation of the SFP standard. The original SFP Module specifications support operation up to 4.5 Gb/s. The SFP+ features support for 10 Gb/s or higher signaling, based on improved impedance matching specifications for better signal transmission.
Vendors provide both active and passive version of the 10G SFP+CU DA cable. A 10G direct attach cable assembly is considered active if there are signal processing electronics in the SFP+ module to improve signal quality and provide a longer cable distance. The least expensive approach is the passive direct attach cable, which tends to be shorter; the active direct attach cable makes it possible to support longer and thinner cable assemblies. The available SFP Cable lengths range from 1 m to 7 m, although you will find variations in supported cable lengths among different vendors.
For example, SFP-H10GB-CU1M in FS.COM, it is fully compatible with Cisco devices. this kind of SFP+ passive copper direct attach cable are suitable for very short distances and offer a highly cost-effective way to connect within racks and across adjacent racks. its connector type is SFP+ passive Twinax cable assembly and compliant to SFP+ MSA. And FS.COM can offer customized service for cable length according to the needs of users.
The direct attach twinaxial cables use the same SFP+ connector module that is used on 10 Gb/s optical fiber links. However, rather than using an optical transceiver at each end and a length of fiber optic cable, the direct attach cable uses the SFP+ module, leaving out the expensive optical lasers and other electronic components. In both active and passive cables, a small electrical component is low cost and consumes very little power.
A direct attach cable is a fixed assembly that is purchased at a given length, with the SFP+ modules permanently attached to each end of the cable. Although significantly thinner than 10 Gbase-CX4 cable, this is still a relatively stiff cable. To install the cable on anything other than closely associated equipment, you must be able to route the cable and its attached SFP+ modules through any intervening cable management trays and cable guides.
Well, FS.COM’s products are in the price at a discount of 30% now and if you have related requirements about fiber optics, welcome to our online FS.COM.