NuBAR-1000 is an ideal Ethernet tester for testing and troubleshooting potential problems of data transmission and bandwidth in the field. NuBAR-1000 works by pair with roles of Lord and Servant. Without extra standby personnel at the other test site, two NuBAR-1000 negotiate with each other automatically, start bi-directional symmetric / asymmetric wirespeed transmission, synchronize the test result and store result at Lord NuBAR-1000.