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When using auto detection the SFP ports on LANCOM switches can only detect the SFP module. No negotiation is done between the tow two connected switches. If for example a switch with a 10 GBit SFP+ module is connected to a switch with a 1 GBit SFP module the link cannot be established. Therefore the link speed must be set to a fixed value (the same value on both switches).
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