Views: 0 Author: Site Editor Publish Time: 2023-07-03 Origin: Site
SFP transceivers are regulated by a multilateral agreement (MSA) between competing manufacturers. SFP is designed based on the GBIC interface, allowing for a higher port density (number of transceivers per inch on the motherboard edge) than GBIC, hence SFP is also known as "mini GBIC". The small package transceiver (SFF transceiver) related to this is smaller in size than SFP, but SFF is inserted vertically into the motherboard as a pin through hole device (not hot swappable), rather than parallel to the side card slot like SFP (supports hot swappable).
At present, most optical SFP transceivers support SFF-8472 (Industry Standard Multilateral Protocol). According to the SFF-8472 protocol, it is necessary to support Digital Diagnostic Monitor (DDM) function. This feature enables end users to detect SFP parameters in real-time, such as the basic five monitoring quantities: output optical power, input optical power, temperature, laser bias current, and voltage.
The SFP MSA defines a 256 byte Memory map in the EEPROM. Standard interfaces, manufacturers and other information can be accessed through the I ² The C interface is accessed at 8-bit address 10100000X (A0h).
