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QSFP+ optics on QSFP28 ports can support 10G SFP+, is it right?


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#1 frankWhite12

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Posted 30 July 2018 - 01:51 AM

Quite confused about the Ethernet netowrk.

So here is the thing, My fiber optic technicians tell me that the QSFP28 optics can not be break out into 10G, but a QSFP+ transceivers on QSFP28 ports can support 10G SFP+. I don't understand? :(

Hope some expert can share some useful insights here! Thanks in advance! if i take a QSFP28 Modules here,can it work?



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#2 toofarnorth

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Posted 30 July 2018 - 06:30 PM

Hello
 

The port on the switch/router will accept a fiber module which you insert into it.
 

This module will determine the capabilites of the transmission over the fiber you connect it to

 

QSFP+ is actually four individual 10Gbit connections run over one pair of fiber. It can be bundled to run one 40Gbit link or separated into 4x 10Gbit links
 

QSFP28 is four individual 28Gbit connections run over one pair of fiber.. It can be bundled to run one 100Gbit link or separated into 4x 25Gbit links.

 

This means that you either increase transfer speeds between single point to single point connections, or you can get more connections crammed into tight spaces.

Here is a QSFP+ to 4x SFP+ cable from Skylane Optics

 

 

QSFP28_Cable-600x0-c-default.png

 

 

 

I hope this cleared things up!

 

tfn






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