Typical tests, such as a BERT test, can be performed. A loopback occurs when a receiving communications device takes all of the data which is received and returns that data unchanged back to the sender. In other words, the received signal was looped back to the sender. In the telecommunications industry, this test is called a loopback test. Loopback, Inc. furnishes general looping facilities for all types of ISDN bonded calls.
Equipment is compliant with general industry standards.
Once the signal has been received, the looping communications device makes sure that the data signal is in sync with the clock signal, and then presents both to the looping device to be sent back to the source where the test was initiated. A Loopback is a good test because the sender is able to test the sending equipment, the communications path, and the receiving equipment. This test can be done with only one person. Since the calling party only uses one location, after the test is completed, the caller has verified the operation of the equipment at the calling location. Typically, only one of the two locations will have a problem.