61200226L1-1 ATLAS 800 PLUS User Manual B-1Appendix B TroubleshootingTable B-1. TroubleshootingSYMPTOM POSSIBLE CAUSES TROUBLESHOOTING TIPSPower-up Self-TestFailsModules seated improp-erly, module failureRemove all modules and cycle power to the unit.If self-test still fails, call Technical Support andreport the results. If the self-test now passes, re-insert modules one at a time, running the self testafter installing each module. When an installedmodule causes the self-test to fail, note it andreport results to tech support.System TimingSource Unlocked(displayed on Ter-minal Interface,“System Status”)Selected Timing Source isnot present or clock is outof tolerance• Verify that system timing is correctly configuredfor the desired clock.• Verify that the interface cable to clock source ispresent.• Temporarily configure the system to operate offof internal timing. Verify that the system can lockto this clock.Cannot pass datafrom T1 interfaceto V.35 portMisconfiguration, impropercabling• Verify that the T1 signal is being received. If not,check that the cabling is correct.• Verify that the T1 is being received without er-rors. If not, double-check that framing and cod-ing are set properly.• Verify that desired dedicated map is active.• Verify that bandwidth is mapped to the correctV.35 port.• Verify that the V.35 port is set to the correct datarate (terminal interface).• Check T1 performance using the terminal inter-face; if excessive errors, report fault to the Telco.• Verify proper state of DTE signals via the termi-nal interface or the LCD front panel.
