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?
 

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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