The term loop-back has the following meanings:
1. A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal.
2. A method of testing between stations (not necessarily adjacent) wherein two lines are used, with the testing being done at one station and the two lines interconnected at the distant station. Commonly called loop around when the interconnecting circuit is accessed by dialing.
3. A patch cable, applied manually or automatically, remotely or locally, that facilitates a loop-back test.
This article contains material from the Federal Standard 1037C (in support of MIL-STD-188), which, as a work of the United States Government, is in the public domain.
A loopback is a communications channel with only one endpoint. Any message transmitted through such a channel is immediately received by the same channel.
1. A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal.
2. A method of testing between stations (not necessarily adjacent) wherein two lines are used, with the testing being done at one station and the two lines interconnected at the distant station. Commonly called loop around when the interconnecting circuit is accessed by dialing.
3. A patch cable, applied manually or automatically, remotely or locally, that facilitates a loop-back test.
This article contains material from the Federal Standard 1037C (in support of MIL-STD-188), which, as a work of the United States Government, is in the public domain.
A loopback is a communications channel with only one endpoint. Any message transmitted through such a channel is immediately received by the same channel.
