HP HSR6800 Configuration Manual page 58

The configurations of clock mode, scrambling, and other physical parameters are consistent on the
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connected two POS interfaces.
The same link layer protocol is configured on two sides.
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Symptom 3
A great amount of IP packets are dropped.
Solution
Check that the correct clock mode is configured on the POS interface. If not, enormous amount of CRC
errors can be generated.
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