MT-6000 PSU plug question

Router
1

It’s a DC5521 plug, but is it center positive or negative? - usually this information is printed on the PSU but to my great surprise it is not.

Does any one know?

2

Center pin is +

3

Hi

For anyone else who may be interested, you should be able to find a symbol like this on the power adapter indicating the polarity.

image
image3000×827 59 KB