DB9 Female to DB25 Female Serial Loop Back Tester

[Music] hey guys brian here from computer cable store and today we're gonna be talking about loopback adapters first thing we'll want to go over what is the purpose of a loopback adapter a loopback adapter is a small device used to test network ports and help identify simple network connection issues it's a great tool when mapping out a physical layout of a network and quickly identifying active ports on a switch the device works by taking the transmitted signal and redirecting it or looping it back into the receiving end of the same connection you'll see in the rj45 Ethernet pin out the TX and rx pairs are linked directly together so the signal will stay in a closed loop the same thing is happening in the gigabit pin out although that uses all four pairs [Music] for our test I have a simple network setup containing an R on a solid cat6 cable which is about 10 feet long it's terminated