SFP (small form-factor pluggable) is a popular industry format jointly developed and supported by many network component vendors.SFP transceiveris designed to support SONET, Gigabit Ethernet, Fibre Channel, and other communications standards.

Main Features:
Industry standard small form pluggable (SFP) package;
Immovable lock Design;
Hot Pluggable;
Duplex LC connector;
Full duplex speeds support;
TTL signal detect indicator;
3.3 VDC power supply;
Industry leading EMI performance for high port density;
Class 1 laser product complies with EN 60825-1;
RoHS compliant.

The Types
SFP Transceivers have a wide range of detachable interfaces to multimode/single-mode fiber optics, which allows users to select the appropriate transceiver according to the required optical range for the network. SFP has transmission rate ranging from 100Mbps to 4Gbps and it can work at distances ranging between 500 meters to hundreds of kilometers. Optical SFP modules are commonly available in several different categories, including single mode SFP, multimode SFP and copper SFP, which are with various working wavelength and functions. Each type comes with different configurations of transmitter and receiver.

Multi-mode fiber
SX - 850 nm, for a maximum of 550 m at 1.25 Gbit/s (Gigabit Ethernet) or 150m at 4.25 Gbit/s (Fibre Channel).
Single-mode fiber
LX - 1310 nm, for distances up to 10 km;
BX - 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-D for Uplink and Downlink respectively, also for distances up to 10 km. Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction;
1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX);
CWDM andDWDM SFPtransceivers at various wavelengths achieving various maximum distances.
Copper fiber
1000BASE-T - these modules incorporate significant interface circuitry and can only be used for Gigabit Ethernet, as that is the interface they implement. They are not compatible with (or rather:do not have equivalents for) Fibre channel or SONET.

Suitable Applications:
Switches/bridges/routers/servers;
SONET/SDH Network;
Gigabit Ethernet;
1x/2x Fiber Channel;
Point-to-point networking;
Metro Access Rings;
Fiber-to-the-desktop (FTTD);
High-speed computer links;
LAN, SAN (local, storage area networks).

The Advantages
SFP, also called a mini GigaBit Interface Converter (GBIC), is an upgraded version of GBIC module. Since SFP is only half the size of the GBIC, making it saved more space. Any future changes can be easily incorporated into the SFP module, it is easier to change and easier for maintenance compared with traditional modules. Users can replace a single SFP module during the process instead of replace the whole board with many modules on it.

SFP optic transceiver is also available with copper cable interfaces, which allows a host device designed primarily for optical fiber communications to communicate over shielded or unshielded twisted pair networking cables. Usually such copper cable interfaces are used when the information to be transmitted needs to cover only shorter distances where use of copper cable is more economical than optic fiber cables.

Modern optical SFP transceivers support digital diagnostics monitoring (DDM) functions, also known as digital optical monitoring (DOM). This feature gives users the ability to monitor the real-time parameters of SFP, such as optical output power, optical input power, temperature, laser-bias current and transceiver supply voltage. SFP transceivers are housed in a metal enclosure and their power dissipation is low. They operate over a wide temperature range and support a large number of different types of cable. An improved version of SFPoptical transceiverstandard called SFP+ can support transmissionrates up to 10Gbps.

Posted by: mikofy at 06:42 AM | No Comments | Add Comment
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