FS1048e 100Mbps capable transceiver

[Disitco]

We are migrating our network infrastructure to FS1048e switches. We have some legacy equipment that  refuses to communicate at a port speed of 1Gbps. The transceivers we are currently using are FN-TRAN-GC. Copilot suggested FN-TRAN-SFP+GC, but the website it referenced is a third party site that doesn't give me much confidence in its accuracy. Our requirements for the transceiver are an RJ-45 connector, compatible with the FS1048e that can operate at a speed of 100Mbps. Has anyone else run into a similar need and found a working transceiver for the FS1048e?

[AEK]

I think FN-TRAN-GC is the one you are looking for.
https://www.fortinet.com/content/dam/fortinet/assets/data-sheets/Fortinet_Transceivers.pdf

[Disitco]

Thanks, but FN-TRAN-GC is the transceiver that we already have and it won't do 100Mbps. Unless it has to be set in the CLI and just can't be set through the webadmin page or through auto-negotiate?

[AEK]

I know on some FGT you need to force 10Gb SFP to run at 1Gb, otherwise it will not work. So if I understand well it could be the same case for FSW.

[Disitco]

I tried to force it within the CLI but slowing things down to 100Mbps is not an option for the FN-TRAN-GC. Fortinet support wasn't able to provide a solution either

[AEK · Accepted solution]

Then I think your solution is one of the following :

• Make the required changes to the connected legacy equipment so it can operate at 1Gb
• Put an intermediate device between FSW and the legacy equipment, like an intermediate switch, that support 1Gb from one side and 100Mb from the other side

[Disitco]

Yeah, it looks like we will be holding on to a couple of 248D's until we can retire the legacy equipment.