Here's a Fortinet link for the FortiGate 1800F series data sheet. The FG-1800F front chassis has 1x RJ45 / USB CONSOLE port, 2x GigE RJ45 out-of-band management ports (MGMT1 and MGMT2), 2x 10 GigE fiber SFP/SFP+ HA1 and HA2 ports (2x fiber SFP included in the box), 16x GigE RJ45 ports, 8x GE fiber SFP ports, 12x 25 SFP28 / 10 GigE fiber SFP+ / GE SFP ports, 4x 100 GigE QSFP28 / 40 GigE QSFP+ ports.
Here's a Fortinet link for the different types of copper and optical transceivers supported in a Fortinet appliance. Third party SFP/GBIC transceivers (such as Cisco brand) would still work in a FortiGate SFP/SFP+ port. It's always best practice to use Fortinet branded SFP in a FortiGate appliance for optimum performance.
Here's a Fortinet link to check the SFP serial number and power (Tx/Rx) level in a FortiGate firewall. You'll need to issue the get system interface transceiver to view all ports or get system interface transceiver <interface> to display the info for a specific interface including its fiber optic levels (Rx/Tx power). Notice port 17 uses a Fortinet brand SFP while port 18 uses a Cisco brand SFP.
FGT# get system interface transceiver
<intface> Interface name.
FGT # get system interface transceiver
Interface port17 - SFP/SFP+/SFP28, 10GBASE-SR
Vendor Name : FORTINET
Part No. : FTLX8574D3BCLABC
Serial No. : N88B123
Interface port18 - SFP/SFP+/SFP28, 10GBASE-SR
Vendor Name : CISCO-FINISAR
Part No. : FTLX8574D3DEF-CS
Serial No. : FNS21510456
Interface port19 -Transceiver is not detected.
Interface port20 - Transceiver is not detected.
<OUTPUT TRUNCATED>
FGT # get system interface transceiver port17
Interface port17 - SFP/SFP+/SFP28, 10GBASE-SR
Diagnostics : Implemented
Vendor Name : FORTINET
Part No. : FTLX8574D3BCLABC
Serial No. : N88B123
Measurement Unit Value High Alarm High Warning Low Warning Low Alarm
------------ ------------ ------------ ------------ ------------ ------------ ------------
Temperature (Celsius) 31.8 78.0 73.0 -8.0 -13.0
Voltage (Volts) 3.29 3.70 3.60 3.00 2.90
Tx Bias (mA) 5.98 13.00 12.50 5.00 4.00
Tx Power (dBm) -2.3 0.0 -1.0 -5.0 -6.0
++ : high alarm, + : high warning, - : low warning, -- : low alarm, ? : suspect.
You can also view the same info via web GUI, just go to Network > Interfaces > Transceiver(s) column > hover over a specific interface SFP serial number to view more details. Note the Cisco brand SFP was detected by the FortiGate but there's a warning: This transceiver is not certified by Fortinet.



