ADTRAN ATLAS 800PLUS user manual Table B-1.Troubleshooting

Appendix B Troubleshooting

Table B-1.Troubleshooting

SYMPTOM	POSSIBLE CAUSES	TROUBLESHOOTING TIPS
Power-up Self-Test	Modules seated improp-	Remove all modules and cycle power to the unit.
Fails	erly, module failure	If self-test still fails, call Technical Support and
		report the results. If the self-test now passes, re-
		insert modules one at a time, running the self test
		after installing each module. When an installed
		module causes the self-test to fail, note it and
		report results to tech support.
System Timing	Selected Timing Source is	• Verify that system timing is correctly configured
Source Unlocked	not present or clock is out	for the desired clock.
(displayed on Ter-	of tolerance	• Verify that the interface cable to clock source is
minal Interface,		present.
“System Status”)		• Temporarily configure the system to operate off
		of internal timing. Verify that the system can lock
		to this clock.
Cannot pass data	Misconfiguration, improper	• Verify that the T1 signal is being received. If not,
from T1 interface	cabling	check that the cabling is correct.
to V.35 port		• 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 correct
		V.35 port.
		• Verify that the V.35 port is set to the correct data
		rate (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.

61200226L1-1 ATLAS 800 PLUS User Manual B-1