ETest presents itself independent kit of the equipment, operation and the condition checking which does not depend on presence or conditions testable channel. For organization of the channel testing tester is connected on one side of the channel. The testable channel is connected to tester to RJ-45 socket. The RJ-45 loopback or another tester (in pair testing procedure) must be connected to the other end of the channel. At power-up, in the event of correct connection of the tester and loopbacks (or another tester), is formed testable communication loop in any testable configurations.
Active testing is founded on principle of the permanent sending of the Ethernet frames with constant length (within the range of from 64 before 1600 bytes) and interframes interval (16 - 65535 bytes) and measurement parameters of their passing.
The standard command ping answers In purpose "passive" testing ETest with the pings length not more than 1400 bytes.