New rear port mappings

Once the new fiber card(s) is/are installed, the port assignments will be, from left to right when looking at the back of the appliance: P1, P2, E1, E2, C, and N. Note that C and N interfaces are only an option on the V20000 G1 appliance running version 8.5.3 or higher. If the E1/E2 or C/N interfaces are being replaced with fiber cards, the copper ports on the lower back of the appliance cannot be used.