[GST-70x] Why I connect GST-70x to device with 1000Base-LX/SX interface and the 1000Base-LX/SX fiber connection fail?

1. Please check the fiber connection between two devices is correct.

2. Please check the 1000Base-LX / SX interface from both devices run at force full duplex mode.

3. Check and if the 1000Base-LX/SX interface of other device run at Auto-negotiation mode only, please enable the Auto negotiation bypass function of GST-70x for successful fiber connection.