For an unmodified 9960 you need the pogo pin adapter to connect the JP1 cable to the remote. Rob sells modified 9960s that can be connected without the adapter.

I think the vendors selling JP1 cables also sell the pogo thing. For occasional JP1 use, the inconvenience of using that adapter is probably minor compared to modifying the 9960 to not need it. But if you haven't bought your 9960 yet, buying it modified from Rob is probably easier.