Today’s approach to transferring information at the greatest speed comes in the form of fiber optic systems. How the cable is manufactured as well as the units that send and receive information are the essential parts of the system. An SFP module is simply the system that understands the signals being sent to it and understands the language to send response messages back. These units are the foundation of any network since they are so simple but provide an essential function.
Normal networks in the home get to a blazingly fast one gigabit speed. While there are very few reasons to ever need that type of speed, the servers that provide the backbone of the Internet need many of these connections to transfer information efficiently. Typical fiber optics today only transfer around 4.25 gigabits, but do so at the speed of light instead of through electrical signals. Newer XFP modules are the advanced version, and those are capable of transfers at up to 10 gigabits. The forthcoming standard of these types of plugs, called SFP+, will change the way these modules are made since they need a controller on the motherboard. This method will be more efficient and cost effective, but ultimately require replaced server boards to use the standard.
The SFP modules were a replacement for what are referred to as GBIC interfaces. The GBIC devices were improved upon by SFPs in many ways, including fitting more plugs into one area and raising the speed of data both in how much can be sent at once and how fast it arrives. The wires are very efficient in a small area, but when the wire gets longer, the response time lowers considerably. Since this standard is still fast and relatively inexpensive now, small networks often benefit from these the most.
Digital optical monitoring capabilities are implemented into Cisco SFP modules, so looking at the network and being aware of what is going on does not have to be accompanied by more devices. Maximum performance is generally obtained by large systems because every single connection can be monitored and the operator can balance information between each system. Many of these systems use the extra resources to perform research or other data intensive tasks when there are not many people using the server.
Removing some of the power from the SFP modules has met some scrutiny because they are no longer entirely interchangeable, but the processors that will assist the SFP+ format are designed to perform more openly. This allows different formats the ability in the future to use the processor in different ways if necessary.
