ADTRAN TSU 120e - Manual (Page 92)

Chapter 7. Test Menu
7-4 TSU 120 User Manual 61202129L1-1
Figure 7-2. Network Loopback Tests
LOCAL LOOPBCK
There are three available choices for setting the local loopback:
Using the arrow keys, select a setting and record it by pressing
Enter . The unit returns the display of 1) LOCAL LOOPBCK
and
2) REMOTE LOOPBCK
REMOTE LOOPBK
This activates the same loopbacks as Local Loopback but at the
far end. It uses either the inband loop-up code as specified by
ANSI T1.403 for line loopback (ATT In-Band LLB), or the FDL
as specified in ANSI T1.403 for payload and line loopback
codes. The following options are available:
LINE ON Activates the line loopback
PAYLOAD ON Activates the payload loopback
NO LOOPBACK Deactivates the loopback
ATT IN - BAND LLB Activates the line loopback using
inband code
ANSI FDL PLB Initiates the transmission of an FDL
payload loopup code toward the far
end
ANSI FDL LLB Initiates the transmission of an FDL
line loopup code toward the far end
TSU 120
DS1
NI CSU
Payload Loopback
Line Loopback
Secondary
Interface