Can RJ-45 port SFP be used in the SFP+ slot?

2017-07-19
Most users feel puzzled about the compatibility of SFP and SFP+, and the real point that puzzles them is if the SFP module will work when plugging it into the SFP+ slot. For lots of engineers, this is also an issue that hard to get a clear answer. In this condition, this post will bring you to conclude an answer to it.
Can RJ-45 port SFP be used in the SFP+ slot?
First of all, SFP optical module can be plugged into SFP+ port in most cases.

Without knowing the exact switch model, but from the experience, SFP module is able to work in the SFP+ slot, while SFP+ module can’t work in the SFP slot. When plugging the SFP module into SFP+ port, the speed at this port is 1G, rather than 10G. Sometimes the port would lock the speed at 1G until re-order the switch. Besides, SFP+ port usually can’t support a speed under 1G. That is to say, we can’t plug 100BASE SFP module in the SFP+ port.

Basically, this issue mostly depends on the switch model, because in some cases, SFP module can work in SFP+ port, but in other cases not. For instance, almost all the SFP+ ports of Cisco switch can support SFP optical modules, but Brocade switches’ SFP+ ports can only support SFP+ modules.

SFP+ is not able to be automatically compatible with 1G to support SFP optical modules.
Can RJ-45 port SFP be used in the SFP+ slot?
Unlike the copper SFPs that are available for automatic compatibility with 10/100/1000, SFP and SFP + fibers do not support auto-compatibility. In fact, most SFP and SFP + will only run at rated speed.

Although in many cases we can use the SFP optical module on the SFP + port, but this does not mean that SFP plugged into SFP + ports can support 1G. In a fiber-optic link, if we insert an SFP optical module on one side of the SFP + port (1G) and then insert the SFP + optical module on the other side (10G) of the SFP + port, it may not work! For this problem, if you use SFP + high-speed cable, it can’t be compatible with 1G.

Conclusion

When using SFP and SFP + optical modules in your network, make sure that the speeds at both ends of the fiber link are the same. 10G SFP optical modules can be used in SFP + ports, but SFP can’t connect to SFP + optical modules. For different speeds, transmission distances and wavelengths, the 10G SFP + optical module can only be used for 10G SFP + ports and can never be automatically compatible with 1G.

SFP+ module,SFP+ transceiver,bidi sfp,XFP module,XFP transceiver Which is good? First choice Fiberland!Thanks for your concern, to learn more about Fiberland, please enter Fiberland website: http://www.fiberlandtec.com/
RECENT BLOG POST
  • 01
    2019-10
    With the continuous development of 5G communication technology, 100G modules are gradually becoming popular. We know that there are many kinds of packages for 100G optical modules. From 2000 to now, the optical module package types have been rapidly developed. Its main package types are: GBIC, SFP, XENPAK, SNAP12, X2, XFP, SFP+, QSFP/QSFP+, CFP, CXP. In the fast-developing network era, some 100G optical modules avoid the risk of being eliminated, and upgraded and revised with the wave of the Internet, such as 100G CFP optical modules.
  • 01
    2019-10
    1. What is the CWDM SFP? The CWDM optical module is an optical module using CWDM technology to implement the connection between the existing network device and the CWDM multiplexer/demultiplexer. When used with a CWDM multiplexer/demultiplexer, CWDM optical modules can increase network capacity by transmitting multiple data channels with separate optical wavelengths (1270 nm to 1610 nm) on the same single fiber.
  • 01
    2019-10
    AOC is the abbreviation of Active Optical Cables, which is called Active Optical Cables in Chinese. AOC active optical is to encapsulate two optical modules and cable together. Because the medium of transmission in the middle is optical cable, AOC optical module, which contains laser devices, has a higher price for DAC. However, its optical aperture is not exposed, it has high reliability, and its working distance can be customized for a long distance of less than 100 meters.
  • 01
    2019-10
    Dense Wavelength Division Multiplexing (DWDM) technology is capable of transmitting data in an optical fiber using bit wavelength parallel transmission or string line transmission using the wavelength of the laser.It is widely used in different fields of communication networks, including long-distance backbone networks, metropolitan area networks (MANs), residential access networks, and local area networks (LANs).The DWDM optical module is the optical module that uses this technology, so the DWDM optical module has high bandwidth and long-distance transmission characteristics.