Why some S3752 switches cannot set up a stack

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An S3752 does not support the stacking function if it uses a print circuit board (PCB) of version A.

Run the display version command on the S3752. If the following information is displayed, the S3752 uses a PCB of version A.

[Unit 0] EMFEA uptime is 0 day, 11 hours, 8 minutes
128M bytes DDR Memory
16M bytes FLASH
Pcb Version : CX22EMFEA REV A
Basic BOOTROM Version : 209 Compiled at Nov 6 2010, 16:31:25
Software Version : VRP (R) Software, Version 5.70 (S3752 V100R005C01)

Other related questions:
Why cannot some S3752 series switches establish stacks?
Run the display version command on an S3752 switch. [Unit 0] EMFEA uptime is 0 day, 11 hours, 8 minutes 128M bytes DDR Memory 16M bytes FLASH Pcb Version : CX22EMFEA REV A Basic BOOTROM Version : 209 Compiled at Nov 6 2010, 16:31:25 Software Version : VRP (R) Software, Version 5.70 (S3752 V100R005C01) If the version of the printed circuit board (PCB) is CX22EMFEA REV A, the switch does not support stacking.

Can CE series switches use stack cards to set up a stack
CE series switches cannot use stack cards to set up a stack.

Stack cables supported by S series fixed switches
For details about stack cables supported by S series fixed switches, click Typical Configuration Examples and choose Typical Stack Configuration of Fixed Switches- Determining the Stack Connection Mode and Hardware and Software Requirements. This section describes whether each model and version of S series fixed switches supports stacking as well as stack modes, hardware and software requirements, typical networking, configuration steps, and also stack cables used to set up various stacks.

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