The Metro1000 EFT single board has RJ-45 type electrical connector on the panel for sending and receiving 10M/100M Ethernet electrical signals. Dimensions (W×D×H): 89.0mm×218.5mm×24.0mm.Weight: 0.25kg.The EFT Ethernet pass-through single board can be plugged into the IU1, IU2 and IU3 slots of the Metro1000v3 device.The single board consists of an interface module, a service processing module, an encapsulation/mapping module, a communication and control module and a power supply unit. The interface processing module accesses signals sent from external Ethernet devices (e.g., Ethernet switches, routers, etc.) for decoding and serial/parallel conversion. Then it enters the service processing module to perform functions such as frame delimitation, stripping leading code, terminating CRC check code and Ethernet performance statistics, and classifies the streams according to the form of service and configuration requirements, and finally sends it to the mapping module to perform VC-12 or VC-3 mapping, and sends it to the crossover unit. The VC-12 or VC-3 signals sent from the crossover unit are demapped and then sent to the encapsulation module for decapsulation. The service processing module determines the routing according to the level at which the device is located. Performs stream classification according to the service form and configuration requirements. Functions such as frame delimitation, adding leading code, calculating CRC check code and Ethernet performance statistics are completed. Finally, the interface processing module carries out serial-parallel conversion and encoding to be sent out by the Ethernet interface.

Problem Description

A bureau opens and finds that the EFT board of Metro1000v3 equipment reports the HARD_BAD alarm, the site has checked that there is no backward pinning, replaced the slot, replaced the board, but still reports the HARD_BAD alarm, the alarm parameter is 0X11 0XFF 0XFF 0XFF 0XFF 0XFF, and the host version is: 5.37.5.12.

Alarm information

hard_bad

Processing

1, the site has changed several EFT boards and found that the alarm will also be reported, basically exclude the single board problem.

2, due to the single board opened the test business, business is normal, so suspect that the alarm is false.

3、After confirmation by the company confirmed that version 5.37.5.12 has the following defects: EFT single board in the port of the business traffic is very small, it may be false alarm HARD_BAD alarm, a complete solution: V300R005C01SPC180 and subsequent versions.

Root Cause

1. Single board failure

2、Alarm false alarm