There are some links in Cisco regarding this:
Some links says the P/N for all Cisco 8xx series routers is PWR-800-WW1.
Some other links say the P/N for 85x and 87x series routers is PWR-850-870-WW1=
I have spent several hours trying to find out which is right.
What is the right P/N for the AC power adapter for
I tried a PWR-800-WW1= and it wouldn't fit into a
CISCO877W-G-A-K9. The connector plug is bigger than the one in the router.
I have this problem too.