CD. Check my previous post. I'm sure it's a 4-core cable with a 6" piece of red twisted down the original red and back up the black. The photograph is a bit fuzzy but I think I can see that this red doesn't go into the cable - and it makes sense. I've never seen a sleeved alarm cable core... Sorry.
Finding the other end of the cable and discovering what's connected where, would be the best solution
Finding the other end of the cable and discovering what's connected where, would be the best solution