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(C) Herbert Haas
2005/03/11
Several Physical Media Supported
Logical Link Control LLC
MAC Control (optional)
Media Access Control MAC
PLS
AUI
PMA (MAU)
MDI
Medium
Reconciliation Reconciliation Reconciliation
PCS
PMA
PMD
GMII
MDI
PLS
AUI
PMA
MII
MDI
PCS
PMA
PMD
MII
MDI
Medium Medium Medium
Data Link Layer
PHY
1-10 Mbit/s 10 Mbit/s 100 Mbit/s 1000 Mbit/s
AUI Attachment Unit Interface, PLS Physical Layer Signaling, MDI Medium Dependent Interface
PCS Physical Coding Sublayer, MII Media Independent Interface, GMII Gigabit Media Independent
Interface, PMA Physical Medium Attachment, MAU Medium Attachment Unit, PMD Physical Medium
Dependent
The diagram above shows various physical media designs supported by the
official GE standard. Each modern GE card could theoretically support the old
10 Mbit/s standard as well. However many vendors create GE NICs that only
support GE or GE and FE—who would connect a precious GE interface with
another interface, which is 100 times slower?