Normally, the J1 byte to be transmitted and the J1 byte to be received in the higher order path should be the same. The HP_TIM alarm is generated on the EGT2 and EFS0 boards. To solve this problem, manually set the J1 byte to be received and the J1 byte to be transmitted to the same values.
Product

OptiX OSN3500
Fault Type

Ethernet fault
HP_TIM
Symptom

When the Ethernet services are configured, the J1 byte to be received and the J1 byte to be transmitted are set to the same values. The HP_TIM alarm, however, is generated on the EGT2 and EFS0 boards.
Cause Analysis

After the Ethernet services are configured, the Ethernet boards at both ends generate the HP_TIM alarm. Check the J1 byte in the single-byte mode on the overhead management interface on the T2000. It is found that the J1 byte to be received and the J1 byte to be transmitted are set to the same values (displayed in hexadecimal). Check the J1 byte in the 16-byte mode. It is found that the J1 byte to be received and the J1 byte to be transmitted are set to different values. Change the value of the J1 byte to be transmitted of the EGT2 or EFS0 board. It is found that the J1 byte received on the other board remains unchanged.
Procedure

Set the J1 byte to be received by the RX Ethernet board in the VC-4 on the SDH line board that corresponds to the TX Ethernet board. Then, the HP_TIM alarm is cleared.
Reference Information

The J1 byte to be received of the RX Ethernet board should be set in the VC-4 on the SDH line board that corresponds to the TX Ethernet board. Change the values of the J1 byte to be transmitted and the J1 byte to be received on the SDH line to prevent the HP_TIM alarm form being generated on the line.