ADTRAN 1204002L2, TSU IQ+ DSX Loopback

Chapter 11. Testing
61200275L1-1 TSU IQ+ User Manual 11-7
DSX Loopback
ADSX LOOPBACK test allows the user to initiate a loopback test at
the DSX-1 interface.
None
Select NONE to stop a test in progress.
Line
Select LINE to execute a line loopback test at the DSX-1 port. During
this test, data loops back toward the terminal equipment (usually a
PBX) connected to the DSX-1 port.
Port
Select PORT to execute a port loopback test at the DSX-1 port.
During this test, data loops back toward the network interface.