ADTRAN DUAL Nx56/64 1200142L1# - Manual (Page 33)

Chapter 3. Operation
61200054L2-1 Nx56/64 (EIA-530) Option Module User Manual 3-11
2)511 PATT: Activates the generation of the 511 test pat-
tern.
On: The pattern check circuitry is enabled and a test
started. The test is ended by selecting Off.
Off: The pattern generation and check is disabled.
3)DIS 511 RESLT: Displays the results of the 511 test
indicated in item 2, above. The results are in the form of
the number of errored seconds. The error count can be
cleared by pressing
Clear ( shift + 9 ).
The TSU 100 checks the remote loopback activation by detecting a proper
response from the remote end. While waiting for the response, the display
shows Looping. If successful, the display changes to Looped Up. If
unsuccessful, the display shows Failed.