User`s manual

Chapter 4 Monitoring and Maintenance
94
Figure 4-16 Optical Local Loopback
Figure 4-17 E1 Local Loopback
Remote Loopback：
When the remote loopback is activated on a selected port, it returns the received
signal towards the remote user equipment connected to the same port. The
remote loopback is performed by connecting the port receiving the signal, after
regeneration, to the transmit path. The test signal is provided by user’s equipment,
which is connected to the remote end of the link, and it must receive its own
transmission.