I may already have the answer to this but I am just making sure. I have watched a few video's that kinda explain how to Jam Sync TC from the Sound Device 744T to the Arri Alexa.
If I am right, you need to connect a 5 pin Lemo cable from the Time Code in/out and connect it to the 5 pin Lemo TC input on the Arri Alexa. From there, you access the TC on the Alexa and countdown to make sure the TC's are in sync.
Am I correct in this? If not, it would be much appreciated if you could shed some new light on this.