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CHIP_FAIL and E1LOC Alarms Are Reported Because the 2M Oscillator Is Intermittently Stopped

Publication Date:  2019-07-17 Views:  156 Downloads:  0

Issue Description

On an OSN 3500, the PQ1 in slot 13 reports the CHIP_FAIL and E1LOC alarms and corresponding services are interrupted. Perform a cold reset for the PQ1 board in slot 13 and then the services are restored. The NE software version:
13 CHIP_FAIL MJ end 2007-6-29 17:1:47 2007-6-29 18:40:9 0x01 0x00 0x0f 0xff 0xff
13 E1LOC MJ end 2007-6-29 17:1:48 2007-6-29 18:40:9 0x01 0x00 0x01 0xff 0x01 


Alarm Information


Handling Process

After a cold reset, the 2M oscillator of the PQ1 board can resume oscillation to provide normal clock signals. In this case, the alarm is cleared and the service is restored.
The 2M oscillator is unlikely to stop oscillating intermittently. In January 2007, the Manufacture Department provides the ASFT test to detect the stress of the temperature. In this way, the faulty boards can be filtered during the manufacturing process. In addition, the service configuration test is provided to further filter the faulty boards. Then, quality of the 2M oscillators delivered can be ensured.
If a 2M oscillator stops oscillating on site, replace it with the oscillator that is manufactured after January 2007. 

Root Cause

CHIP_FAIL is an alarm that indicates the failure of the import chip. PARA[0] and PARA[1] indicate the number of the faulty chip; PARA[2] and PARA[3] indicate the type of clock-related fault. See "Phenomenon Description", PARA[2] in the information about the CHIP_FAIL alarm is 0f, indicating that chip SA527 detects that the 2M clock is lost; PARA is 0xff, indicating that eight SA527 chips of the PQ1 board detect that the MCLK clock is lost. Hence, the 2M clock of the PQ1 board is already degraded and 2M oscillator stops.
The E1LOC alarm is detected by the SD538 chip. The SD538 chip extracts 2M clock from the service sent by the SA527 chip. If the 2M clock of the SA527 chip is lost, the SD538 chip cannot extract any clock. Hence, the SD538 reports the E1LOC alarm.