Chapter 7. Test Menu7-2 TDU 120e User Manual 61202156L2-1Menu flow is depicted from left to right. At every level ofthe menu, pressing Escape returns the system to the pre-vious menu level. Pressing Escape repeatedly returns thesystem to the M AIN menu.Network TestsNetwork tests control the activation of loopbacks and theinitiation of data test patterns.Network tests are run on the Network Interface (NI). Youcan select three different test configurations to determinethe type of loopback and the pattern to run. Test resultsdisplay in the LCD window.Loopback TestsA number of different loopbacks can be invoked locallyfrom the front panel, by T-Watch PRO commands, or re-motely by using special in-band codes (AT&T D4 net-work loop-up and loop-down codes). Additionally, theloopbacks can be remotely controlled by means of out-of-band commands by the T1 ESF FDL or from T-Watch PROby a modem connection.Executing tests will disrupt some of the normal operation. See individual menuitems concerning tests before executing.Executing Network Tests will disrupt normal data flow unless only TST DS0sare selected for testing.
