188 CHAPTER 8: PSTN G ATEWAY CONFIGURATION4 Click the Performance Data tab.5 Click G.826 Near End.6 See the online Help for details for more information.G.826 Far End To view E1 Span far end statistics:1 Log in to the NBX NetSet utility using the administrator username andpassword.2 Click PSTN Gateway Configuration > ISDN PRI Spans.3 Click a MAC address.4 Click the Performance Data tab.5 Click G.826 Far End.6 See the online Help for details for more information.Using LoopbackTestsThe 3C10116D T1 and 3C10165D E1 cards can respond to commandsfrom the Central Office to loop back data at different points fordiagnostic purposes.You use the NBX NetSet utility to enable each loopback test and toinitiate the Local and Framer loopback tests. The Central Office, or testequipment that emulates Central Office equipment, must initiate Lineand Payload loopback tests.For detailed logging information, you can enable TEP logging before youenable loopback testing. However, to set up logging and interpret thelogs are advanced tasks that require help from a technical supporttechnician. You can see a simple pass/fail result by viewing the spanstatus, as described in “Enabling or Disabling Loopback Tests” onpage 189. To see the loopback test status of all spans, click PSTNGateway Configuration > Digital Line Cards > Config & Status Report.The cards loop back data at the following points and with the followingcharacteristics:■ Line Loopback — A loopback in which the signal returned towardthe source of the loopback command comprises the full 1.544 Mbits/ssignal with bit sequence integrity maintained, no change in framing,and no removal of bipolar violations.
