I am at the start of my AllStar journey 
I have converted my Baofang accoring to this Utube video, Baaofeng UV-5R conversion for ALLSTAR - Search Videos
but have a problem , with the COS connection. I do not know enough about the system yet to know what it is apart the fact that I need it. Could someone with experiance please view the video and tell me if the COS is on the 2.5 R1 connection. You will see these references near the end of the video where connections from the Baofang are shown.
I know this is a big ask, but I am stuck at the moment.
73 de Paul OE8PCK