Can you use an Ethernet cable (Cat6) in a switch's SFP+ port to connect to another switch?

  • In the port itself, or in the SFP transceiver which is plugged into the port? Commented Jul 17, 2020 at 15:54
  • plugging a cat 6 cable into the switches SFP+ port and then connecting to the other switches SFP+ port Commented Jul 17, 2020 at 16:32
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3 Answers 3


Assuming you have compatible SFP-T transceivers, Yes.


An SFP(+) port requires a PHY module unless it's used with a direct-attach cable (DAC) that has fixed SFP+ modules at its ends.

Not all SFP/SFP+ ports support 1000BASE-T modules. Quite a few SFP+ ports don't support 10GBASE-T (and if they do the reach is normally reduced to 30 m or so).

In any case, you'll need to check the device documentation for compatible modules. Most vendors also try to force you to use "original" modules, so you'll make sure the module at hand shows the required brand as well.


No, you need to put an SFP transceiver in the port, and then you plug the cable into the transceiver.

A RJ45 (Ethernet) connector will kinda fit in a SFP+ port, but it won't work because the wires won't get connected. It's like plugging USB into an Ethernet (RJ45) port.

  • if both switches have a Copper Combo SFP Port would that work? Commented Jul 17, 2020 at 16:43
  • Most combo/dual-personality ports don't accept TP SFP modules on the SFP-side port version.
    – Zac67
    Commented Jul 17, 2020 at 16:46
  • @user10776032 Well that means they have a copper port next to the SFP port and you can only use one or the other.... So you just use the copper port, which isn't an SFP port, and don't worry about SFPs. Commented Jul 17, 2020 at 16:46

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