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

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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.

Other related questions:
Whether front cards and rear stack cards can be used together on S series fixed switches
S5700-EI, S5710-LI, and S5700-C-SI series fixed switches have front and rear card slots. Font card slots can have 2-port or 4-port service interface cards installed. Rear card slots can have stack cards or extended channel cards installed. The rules are as follows: -- A 4-port ES5D000G4S01 or ES5D00G4SA01 GE front card and a 4-port ES5D000X4S01 10GE front card must be used with an ES5D00ETPB00 rear extended channel card; otherwise, only two ports on the 4-port front card can work. -- If an ES5D000G4S01 or ES5D00G4SA01 front card is used with an ES5D00ETPC00 rear stack card on an S5700-EI, S5700-SI, or S5710-C-LI switch, only the first two ports on the front card can work when the switch is working normally. If the ES5D000X4S01 front card is used, only ports 1 and 3 are available. --The ES5D00ETPB00 card used with the ES5D000X4S01 front card must have a PCB of version C. -- The S5700-EI switch that uses the ES5D000X4S01 front card must have a PCB of version B or later (version C on S5700-52C-EI). You can run the display version command to check the PCB version of a switch. For details about cards, see the Hardware Description. For the hardware description of S5700 switches, see S5700 Hardware Description. For the hardware description of S6700 switches, see S6700 Hardware Description.

Must 4-port GE cards and 4-port 10GE cards of the S5700EI and S5700SI switches be used with rear extended channel cards
When a 4-port GE card or 4-port10GE card is used without a rear extended channel card, only two ports on the card are available: - 4-port GE subcard: Only the first and second ports can be initialized. The two ports are displayed as GigabitEthernet */1/1 and GigabitEthernet */1/2 after initialization. - 4-port 10GE subcard: Only the first and third ports can be initialized. The ports are displayed as XGigabitEthernet */1/1 and XGigabitEthernet */1/2 after initialization.

Difference between CSS and stack on S series switches
For S series switches, both stack and cluster indicate that combine multiple switches are virtualized into a logical switch. In V200R001C00 and earlier versions, there is only one name called stack in Chinese. In later versions, fixed switches use stack and modular switches use the cluster. Each cluster allows only two member devices, whereas a stack can contain a maximum of nine member devices.

Does the installation of a stack card in an S series switch affect functions of the front card
The stack card and extended rear channel card of a switch use the same slot, and they cannot be installed simultaneously. When a stack card is installed, no extended card can be installed in the switch. Therefore, when a stack card is installed in a switch, only two front interfaces of the switch are available for the front card.

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