Testing
5-9
7110-A2-GB20-00
June 1997
Data Terminal Loopback
Data Terminal Loopback (DTLB) loops the user data back to the DTE. This
loopback is located as closely as possible to the User Data Port (DTE) interface.
Procedure
To run a data terminal loopback:
1. Position the cursor at the Start command next to Data Terminal Loopback on
the Data Port Tests screen.
2. Press Enter.
3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.
DSU
CSU
DTE
Interface
Aggregate
T1
Network
Port
97-15145-01
DTE
Port
Local Loopback
Data Terminal Loopback cannot be started when any other loopback is already
active on the data port.