The SRX3K-16GE-SFP adds 16 ports for Gigabit Ethernet traffic from either copper or fiber interface media. It is inserted horizontally into the midplane of the services gateway to communicate with the SFB and to receive power. To use fiber interface media, install small form-factor pluggable (SFP) transceivers on the desired ports. LEDs on the faceplate of the IOC indicate port status and connectivity. Ports are numbered from top to bottom and left to right, 0-15.