I have an existing stack of WS-C3750X-24T-L switches and I am trying to find out if I can add a WS-C3750X-48P-S which would enable me to have a 10Gb uplink to our new core. I an initially leaning towards this configuration not working as the new 3750X switches have a Stacking cable AND a Stacking power cable which the older 3750's do not have. Am i right?
From the 3750X Q&A -
Q. Are mixed stacks supported?
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A. It depends. The Cisco StackWise and StackWise Plus solutions are flexible enough to allow you to:
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• Stack any Cisco Catalyst 3750 switch in the same stack (hardware mixed stack)
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• Stack any Cisco IOS Software feature set in the same stack (software mixed stack)
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One exception is the new LAN Base models being introduced with the Cisco Catalyst 3750-X Series, which can stack only with other Catalyst 3750-X LAN Base models.
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Q. Can a Cisco Catalyst 3750-X Series Switch with LAN Base software be used in any Cisco Catalyst 3750 stack?
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A. No. LAN Base models can stack only with other LAN Base models.
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Q. Can a Cisco Catalyst 3750-X LAN Base switch be upgraded to IP Base and stacked with any Cisco Catalyst 3000 switch?
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A. Yes. Once a Cisco Catalyst 3750-X LAN Base switch is upgraded to IP Base or IP Services, it can be stacked with any non-LAN Base switch or stack.
So yes you can use it in a mixed stack with the right feature set. However the WS-C3750X-24T-S also supports Stackpower and as far as i know this is only supported on the X series so you won't be able to use that feature.