Packet Loss Occurs in Ethernet Service Testing of the L4G Board

The packet loss occurs in Ethernet service testing of the L4G board due to the different equipment and meters.

Product

OptiX Metro 3000

OptiX Metro 1000

Fault Type

Ethernet service

Symptom

In a test of EPL and VLAN networking by using the L4G board, the Smartbits meter is used to transmit complete bandwidth signals that are looped back on the client side at the remote end. During the test, a packet loss ratio of 0.001% is found. If the EPL networking is set up without the VLAN networking, no packets are lost on site.

Cause Analysis

In the EPL networking, exact synchronization of Ethernet networking can hardly be realized and a frequency deviation tolerance of +/-100 ppm is permitted. Hence, different equipment and meters trace different clock sources. If the inner oscillation frequency of the transmit unit is quicker than that of the receive unit, packet loss occurs.

Procedure

1. None.

Reference Information

None.

More related:

When Interruption of Existing Services on Some Data Boards of OSN Products

How to do when Bit Errors Occur in Lower Order Path Due to Improper Grounding

What Caused Occasional NE Unreachability

Certain Boards Report the TF Alarm Transiently

Certain boards report the TF alarm transiently because the FAN speed is low and the board temperature reaches 60°C centigrade.

Product

OptiX BWS 1600G

Fault Type

Fan

TF

Symptom

The LWF board in the BWS 1600G reports the TF alarm transiently. Reseat the board and the alarm is cleared. The alarm, however, is generated again several days later. Query the board performance by using the T2000. It is found that the temperature of slots 1, 2, 11, and 12 is extremely high and reaches 60°C centigrade. Then, check the fan status. The fan is working normally. Check the PMU performance. The ambient temperature is 35°C centigrade.

Cause Analysis

• The NE temperature is very high because the ambient temperature is extremely high.
• The laser of the board is aged.
• The fan speed is very low and thus the temperature in certain areas in the NE is very high.

Procedure

1. Measure the ambient temperature. The ambient temperature is 25°C centigrade, which is normal.
2. Measure the NE temperature. The temperature in the two sides of the NE is very high and the temperature in the middle area is normal.
3. Check the fan speed. It is found that the air distribution on the right and left sides is inadequate.
4. Replace the fan board. The board temperature becomes normal and the TF alarm is cleared.

Reference Information

None.

If you want Huawei product, such as OLT, OTN, DSLAM, MSTP, please contact us at Sales@thunder-link.com

More related:

How The SSE3LWF Board Reports the OTU_LOF Alarm When Interworking with the SSE1TMR

Warning of Unexpected NE Resets Resulted from Resetting Boards Without a CPU on MSTP NEs

What’s the alarm on the OptiX OSN 1800II board restarts after power-off