Belkin ADSL Modem Pre-N router polarity question

Positive or negative centre pin? Model label indicates F5D8630-4 ver1000uk although its not on the Belkin web site It is marked airgo true mimo with three antennae.

Sadly I've lost the power supply block. The router indicates DC 15v/1A but nothing to specify polarity!

Anyone got a power block to physically check polarity?

TIA

I have a couple of Belkin routers (all different models) and all have center positive.

incidendely, My Draytek and Netgear blocks are also center positive

I have the same problem, I lost the adapter block. Xon, the center positive polarity worked for you? Thank you for your reply.