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Ethernet Transformer

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Can someone tell me what is the meaning of Open circuit inductance and why we need to take care while choosing magnetics?

Also I have seen that, the turns ratio for selecting magnetics is 1:1 and must be 350uH. Can someone tell why is this value of 350uH is recommended? Can we increase or decrease this inductance value?
 

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Transformer inductance requirements can be derived from 10BASE-T load specification, e.g. in IEEE 802.3 clause 14. Higher inductance would be no problem as such, lower inductance can be extected to cause a violation of the waveform mask.
 

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