I am trying to configure my new TL-SX3008F to use 1Gi and 1.25Gi SFP modules. Each time that I attempt to configure a port I receive the glorious feedback "Invalid port number." Can someone please tell me how I am supposed to configure this device? Following are the commands I have tried:

TL-SX3008F#interface gigabitEthernet 1/0/8                             

Invalid port number.

TL-SX3008F#int gi Te1/0/7                                              

Invalid port number.

TL-SX3008F#show interface configuration

Port      State       Speed     Duplex    FlowCtrl    Description

----      -----       -----     ------    --------    -----------

Te1/0/1   Enable      10G       Full      Disable     

Te1/0/2   Enable      10G       Full      Disable     

Te1/0/3   Enable      10G       Full      Disable     

Te1/0/4   Enable      10G       Full      Disable     

Te1/0/5   Enable      10G       Full      Disable     

Te1/0/6   Enable      10G       Full      Disable     

Te1/0/7   Enable      10G       Full      Disable     

Te1/0/8   Enable      10G       Full      Disable     

TP-Link - on a side note: I have found the process to get this far to be FAR TOO COMPLICATED! The documentation provided with the device is useless! You restructured your site so much that Google is confused! Links to documentation fail! This is not service! You need to replace your QA and Project Management staff! To get to this point should have only taken me an hour at most. I have exhausted more than 5 hours trying to figure out how to connect to this device! I am truly questioning if this purchase was worthwhile!