Cisco C6840-X-750W-AC 750W AC Power Supply
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Campus switch power redundancy and stacking design
Treat the data stack and the power-sharing system as two separate designs.
Deployment scope
Treat the data stack and the power-sharing system as two separate designs. Draw the data-stack ring separately from power connections. Calculate endpoint PoE plus chassis demand and the capacity remaining after the intended supply failure. Allow space for connector access, bend radius and service replacement.
Component decisions
- Stack adapters for C9200, C9200L and C9300L are not universally interchangeable. Confirm whether an offer contains an adapter or a complete kit.
- PWR-C1, PWR-C4, PWR-C6 and C9K-PWR families require exact host and power-mode checks. Rated output is not measured switch consumption.
- CAB-SPWR-30CM is a power-sharing cable, not a data stacking cable. Two power supplies do not guarantee full-load redundancy.
Acceptance plan
- Record adapter, cable and power supply part numbers and counts.
- Validate the intended data-stack topology and member failure behavior.
- Test power mode and remaining PoE capacity when one supply is removed under an approved maintenance procedure.
Configuration boundary
StackWise carries stack data and control traffic. StackPower shares electrical capacity on supported systems. A data stack can be working while the power redundancy objective is not met; the acceptance records must test both independently.
Technical references
Cisco Campus LAN and Wireless LAN — official reference: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-campus-lan-wlan-design-guide.html Catalyst 9300 ： — official reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/hardware/install/b_c9300_hig/Product-overview.html Cisco Introduces New Catalyst 9300X Switches Designed for the Need for Speed — official reference: https://blogs.cisco.com/networking/cisco-introduces-new-catalyst-9300x-switches-designed-for-the-need-for-speed Catalyst 6840-X — official reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6840-x-switch/datasheet-c78-734470.html Cisco Catalyst 9300 — official reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html Cisco Catalyst 9500 — official reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9500-series-switches/nb-06-cat9500-ser-data-sheet-cte-en.html Cisco Catalyst 9200 — official reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9200-series-switches/nb-06-cat9200-ser-data-sheet-cte-en.html
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