The BD_STATUS alarm was not cleared after replacing the spare board on OSN9800

Issue description

In Huawei OSN9800 U32E, Slot 106 TUN1PSU was reported BD_STATUS alarm, and the alarm was not cleared after replacing the spare board.

Handling Process

1．Check the related register of the master and slave U2CTU, the result show that the PSU in slot 106 is not in position.

2. PSU in-position detection principle: The PSU in-position signal is sent to master and slave U2CTU through the backplane. The active main control board detects the in-position status. Currently, both U2CTU detect the slot 106 PSU is not in position, so there maybe 4 point should to be checked as below:

Root cause

The in-position cable of the PSU is in poor contact. (Bend pins on the backplane and system control board slots) or the board is faulty.

Solution

Take 1pcs spare part of TNU1PSU board to the site, and check on site as below steps to do trouble shooting:

Step1. Remove the PSU in slot 106. Check whether the slot 106 on the backplane and the board connector have bent pins or dirty, as shown in the following figure. Take photos and record them. If backplane is normal, replace the spare PSU. Wait for 5 minutes, if the BD_STATUS alarm persists, please use the following command to collect data and go to next step:

:cfg-get-chipreg:70,0,0x2000c00,8

:cfg-get-chipreg:78,0,0x2000c00,8

Step2.Remove the standby system control board (in slot 70). Check whether the slot 70 on the backplane and the board connector have bent pins or dirty. Take photos and record them. If normal, wait for 5 minutes and check whether the PSU in slot 106 still reports the BD_STATUS alarm. If the alarm persists, please use the following command to collect data, then reinsert the U2CTU in slot 70 and go to next step.

:cfg-get-chipreg:70,0,0x2000c00,8

:cfg-get-chipreg:78,0,0x2000c00,8

Step3.After the 70 system control board starts up and the two boards are in good state, switch over the active and standby system control boards, remove the standby system control board (in slot 78), Check whether the slot 78 on the backplane and the board connector have bent pins or dirty and take photos. If normal, wait for 5 minutes. Check whether the PSU in slot 106 still reports the BD_STATUS alarm. If the PSU still reports the BD_STATUS alarm, please use the following command to collect data, reinsert the U2CTU in slot 78.

:cfg-get-chipreg:70,0,0x2000c00,8

:cfg-get-chipreg:78,0,0x2000c00,8

Step4.If the BD_STATUS still report after above steps, it should be the backplane is faulty.