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# ethtool eth0
Settings for eth0:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
    Advertised auto-negotiation: Yes
    Speed: 10Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 4
    Transceiver: internal
    Auto-negotiation: on
    Current message level: 0x00000000 (0)
    Link detected: yes

The question is what does TP mean? I found out MII means media independent interface. Also I am wondering why can't I change the value of port:

# ethtool -s eth0 port tp
Cannot set new settings: Invalid argument
  not setting port
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1 Answer

It means Twisted Pair. The cable and port are named after the wire-twisting method which due to the chemical / mechanical properties of the metal reduces cross-talk and interference between several cables.

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I thought about this. But how could an integrated single port eth card have both - mii and TP? Or is it the case that the TP phy is connected through card's mii port and it is just not possible to select the other one? I assume the card has two ports but only one is wired for use in the device. –  akostadinov Sep 9 '13 at 11:39
    
Never payed attention to that bit, to be honest. Hopefully someone else will have a better (complete) answer. –  Ярослав Рахматуллин Sep 9 '13 at 13:29
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