Transport signal thru mult cables simultaneously?

So I want to break-in two digital cables at the same time; one AES/EBU and one SE. I have the AES/EBU in input one on my DAC and the SE in input 2. Does signal pass through both cables regardless of which input I'm listening thru or does only the cable which is plugged into the engaged input receive signal? Doesn't the transport output signal thru all cables which are plugged into its output jacks; or does the circut open on the cable which is plugged into the non-engaged input such that the signal does not pass thru it? Bottom-line: Can you break-in two digital cables simultaneously using the same transport/DAC?