Differences between stack cards and extended rear channel cards of S series switches

The stack card and extended rear channel card of a switch use the same slot, and they cannot be installed simultaneously.
Stack cards are used when switches set up a stack in stack card connection mode. The extended channel card of a switch must be used together with the front four-interface card.
To enable a front card of a switch, an extended rear channel card must be installed. If not, only two front interfaces are available.

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