Chapter 4. Example Operations110 TSU 120 User Manual 61200.129L1-1Test the Nx56/64 InterfaceThe Nx56/64 interface is tested by essentially the samemethod as the Remote Loopback is tested.From the 4)TEST Main menu scroll or use number 3 toselect 3)PORT TEST. Enter activates the PORT TESTmenu. Scroll to select the Port to test and Enter toactivate. (For this example the 0.1 Nx56/64 is used.)The unit displays a menu with the cursor on1)LOOPBK. Scroll to select Remote and Enter toactivate. The display shows Looping while sending aV.54 loop-up code to the far end and waiting for aloop-up verification.If no verification is received after five seconds, thedisplay reads Failed.Upon receiving verification of proper loopup, start the511 pattern by selecting 511 PATTERN using menuitem 2)511 PATT:ON.The results (which are shown under menu item4)PATTERN RESULTS) are a display of a count of thenumber of seconds with error since the test wasinitiated and pattern sync was achieved. The Clearkey(shift + 9) is used to clear errored seconds count.For the 511 pattern, the TSU 120 provides a count of thenumber of seconds which contained errors, not an actualerror count.Test TerminationSelect 511 Pattern Off and deactivate the RemoteLoopback by selecting Off for the Loopbk menu itemnumber 1.
