10Gb SFP+ 光纖模組插入支援1G SFP SWITCH的光纖PORT，是否會通？

會，我的認知是石英震盪器在Switch上，所以10Gb SFP+安裝在1Gb SFP會以1Gb方式運作！

若是將10Gb SFP+ 安裝在switch 10Gb SFP+上，與另外一台switch 1Gb SFP的光纖對接，這樣反而不會通喔！

FYI

https://ithelp.ithome.com.tw/articles/10189738

http://www.cables-solutions.com/can-i-use-sfp-transceiver-in-sfp-plus-slot.html

SFP Can be Plugged into SFP+ Ports in Most Situations

I’m not sure about the specific switch model, but as a general rule of thumb, SFPs will work in SFP+ slot, but SFP+ optics do not work in SFP slots. It’s just a power availability thing. When you plug the SFP module in SFP+ port, the speed of this port is 1G not the 10G. And sometimes this port will lock the speed at 1G until you reload the switch or do some fancy set of commands. Besides, the SFP+ port usually can never support speed under 1G. That is to say, we can’t plug the 100BASE SFP in the SFP+ port. In fact, for this question, it may depend greatly on the switch models – sometimes SFPs are supported in SFP+ ports, and sometimes not. For example, almost all SFP+ ports of Cisco switch can support SFPs and many SFP+ ports of Brocade switch only support SFP+. Though it’s feasible often, it’s safer to ask your switch vendor for some information.

其實阿所有設備有相容的 SFP or GBIC 表
不相容的插到設備上10GB不會變1GB
是不能用 ㄎ ㄎ ㄎ
估歌都茶的到 不然就掐廠商提供
樓上的回答都很瞎