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