Hi Siriphan,
Thank you for bringing this discrepancy to our attention.
All 8 and 10-port switches use external power supplies.
We will work on getting the 300 series datasheet updated.
Regards,
Cindy Toy
Cisco Small Business Community Manager
for Cisco Small Business Products
www.cisco.com/go/smallbizsupport
twitter: CiscoSBsupport
Regards,
Cindy
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