3com Boomerang and 3com Cyclone

[Admin-Eng]

3com Cyclone :-
dmesg :
3c59x.c:v0.99H-WOL 2/24/99 Donald Becker
http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
eth0: 3Com 3c905B Cyclone 100baseTx at 0x1000,  00:10:4b:11:96:5c, IRQ 11
  8K byte-wide RAM 5:3 Rx:Tx split, autoselect/Autonegotiate interface.
  MII transceiver found at address 24, status 786d.
  MII transceiver found at address 0, status 786d.
  Enabling bus-master transmits and whole-frame receives.

vortex-diag :
Found a 3Com PCI Ethernet 3c905b rev 4 at 0x1000.
 Indication enable is 06c6, interrupt enable is 06de.
 No interrupt sources are pending.
 Transceiver/media interfaces available:  100baseTx 10baseT.
 MAC settings: full-duplex.
 Station address set to 00:10:4b:11:96:5c.
 Configuration options 4000.

On 3Com Boomerang
dmesg :
3c59x.c:v0.99H-WOL 2/24/99 Donald Becker
http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
eth0: 3Com 3c905 Boomerang 100baseTx at 0x1000,  00:60:08:2d:9d:e3, IRQ 9
  8K word-wide RAM 3:5 Rx:Tx split, autoselect/MII interface.
  MII transceiver found at address 24, status 786f.
  Enabling bus-master transmits and whole-frame receives.

vortex-diag :
vortex-diag.c:v1.07 11/24/98 Donald Becker (becker@cesdis.gsfc.nasa.gov)
Found a 3Com PCI Ethernet 3c905 rev 0 at 0x1000.
 Indication enable is 06c6, interrupt enable is 06de.
 No interrupt sources are pending.
 Transceiver/media interfaces available:  MII.
 MAC settings: full-duplex.
Maximum packet size is 0.
 Station address set to 00:60:08:2d:9d:e3.
 Configuration options 4000.


Both card are connected to 3Com 3C16980 switch (100/10)
The question is :
------------------
1) Transceiver/media interfaces available:  MII.	  
and 
Transceiver/media interfaces available:  100baseTx 10baseT.
whats the difference ?
2) I'm using these cards on my beowulf clusters. What the difference
(speed) if i set it to half-duplex instead of full-duplex ?

thanks

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