Chapter 7. Test Menu61202129L1-1 TSU 120 User Manual 7-9Port Test Menu Items for 0.1 Nx56/640.1 Nx56/64 is the base Nx interface. It offers the following testfunctions:DTE LOOPBKThis initiates a loopback. The following options are available:The TSU 120 checks the remote loopback activation by detectinga proper response from the remote end. While waiting for the re-sponse, the display shows Looping. If successful, the displaychanges to L OOPED-U P. If unsuccessful, the display shows F AILED.511 PATTERNThis activates the generation of the 511 test pattern. The follow-ing options are available:511 RESULTSThis displays the results of the 511 test indicated in the 511option. The results are in the form of the number of errored sec-onds. The error count can be cleared by pressing Clear (Shift+9).PRT/ LCL The Nx port activates both a Localloopback (back toward the DTE) and a Portloopback when either is invoked.REMOTE The remote loopback causes a V.54 code tobe sent to the far end. The Nx at the far endactivates a PORT/LCL loopback upondetection of the V.54 code.OFF The loop is deactivated.ON The pattern check circuitry is enabled and atest started. The test is ended by selectingOFF.OFF The pattern generation and check isdisabled.
