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
  • 19
    2017-10
    Today we want to share some about the media converter with you after some customers asked about it.Media converter is made up for the traditional Ethernet short transmission distance to realize long distance transmission of the signal.
  • 19
    2017-10
    40G network is more and more popular nowadays. Know the information about 40G optical transceiver module is important for you to deploy 40G Ethernet.
  • 19
    2017-10
    In the past year, the rapid development of cloud computing, Internet, and AI make the data center develop very fast, whether it is the building of data center or the need of data center performance improvement becomes more and more urgent. By 2019, the Global Data Center optical transceiver shipments reached 10 million, and market scale will be 4.9 billion U.S.
  • 16
    2017-10
    Transceiver optics and cables are necessary accessories to HP 5820 switch series, and they play an important role in the fiber cabling infrastructure, this article will introduce the optical transceiver and cabling solutions for them.