While reading through the install manual, I came across a part that says PCB verification. It says before connecting MDF cables, insert test cable to the first DLI port. Im looking inside the switch case now wondering where is the first SLI port and what test cable?

Any help would be appreciated.

Been a while since I installed one, but I never bothered with that step because it did not make sense. The 1st DLI Port is on the Amphenol connection.... Never heard of a Samsung DCSC "Test Cable"

Just hook it up and it should work.

With no expansion its all on the p1 amp conn. Just double check your wiring to make sure its ok and hook it up. You sure don't want to run a ringing co into your dli ports that would be bad.