LPT Switching Fails Due to Inconsistency of LPT Bearer Mode

If the LPT bearer modes of the ports at both ends are inconsistent, LPT switching may fail. Hence, ensure that the LPT bearer modes of the ports at both ends are consistent.

Product

• OptiX OSN 1500A/1500B
• OptiX OSN 2500
• OptiX OSN 3500
• OptiX OSN 7500

Fault Type

• LPT
• Fault in the Ethernet

Symptom

In the case of R006 or earlier versions, LPT fails to work normally when the EFS board interconnects with the EMS4 board. After the service at the SDH layer is disconnected, automatic switching can be normally performed at both ends. After the network cable is removed from an Ethernet port, automatic switching at the opposite end fails.

Cause Analysis

In the case of version R006 or earlier than R006, the LPT function of the EFS board supports the MAC bearer mode only whereas the EMS4 board supports the GFP bearer mode only. Hence, the EFS and EMS4 boards fail to interconnect with each other due to different LPT bearer modes after the LPT function is enabled.

Procedure

1. Modify the LPT bearer modes of the ports at both ends to be the same.

Reference Information

In the case of R006 or earlier versions, do not interconnect the EFGS boards with the EMS4 boards after the LPT function is enabled.

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