ADTRAN T1-FT1 - Manual (Page 69)

Chapter 4. Testing Example
61200060L1-1 TSU User Manual 4-3
8. Use the up and down scroll keys to set PAYLOAD in data
the field. (Must use V.54 PLB ON For Fractional T1 on
Public Networks.)
9. Press ENTER to activate a Remote Payload Loopback .
This initiates the transmission of a loopup code toward the far
end.
10. When completed use the up and down scroll key or the
number 3 to select 3)TEST PATTERN .
11. Press ENTER to activate the TEST PATTERN submenu.
12. Use the up and down scroll keys to select 511 ALL DS0s .
13. Press ENTER to activate the selection.
The TSU always checks for 511 errors. The results of this
check are shown under submenu item
4 .
14. When through viewing the results, press the CANCEL key
to return to submenu item 3)TEST PATTERN and select
NONE to terminate the test and the 511 pattern
generation. The far end will still be in loopback until the
network
REMOTE LOOPBK is set to NONE under
submenu item 2)REMOTE LOOPBK .
3 ) T E S T P A T T E R N :
5 1 1 A L L D S 0 s
4 ) C L R 5 1 1 E R R O R S
5 1 1 E R R O R S = 0