Why only two optical interfaces are displayed after a front card is installed on an S5700

The reason is that no extended rear card is installed on the S5700.
An S5700-EI or S5700-SI can provide only two optical interfaces for a front card. If a 4-port front card is installed, an ETPB extended rear card must be installed to provide the other two ports. Otherwise, only two optical interfaces are displayed.

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