Ethernet: Difference between revisions
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==10GigE== | |||
===10GBASE-T=== | |||
* Reuses the existing 1000BASE-T MAC | |||
* Full duplex only | |||
* 4 connector, 4 twisted pairs (lanes) copper cabling | |||
* 10-level PAM code (3 bits/symbol) | |||
* Retains 8-state 4D trellis code across pairs | |||
* 833 Mbaud, ~450MHz bandwidth | |||
* Echo-cancelled transmission, FEXT cancellation | |||
** 10Gbps = 4 lanes * 833 Mbaud * 3 bits/baud | |||
===10GBASE-CX4=== | |||
* Short distance copper twin-ax | |||
==GigE== | |||
* 5-level PAM code (2 bits/symbol) | |||
* 125 Mbaud, ~80MHz bandwidth | |||
==Fast Ethernet== | |||
==Addresses== | ==Addresses== | ||
An address is ''unicast'' if the least significant bit of the first byte is 0. Otherwise, it is either ''broadcast'': | An address is ''unicast'' if the least significant bit of the first byte is 0. Otherwise, it is either ''broadcast'': | ||
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* (224.0.0.251, ff02::fb): mDNS | * (224.0.0.251, ff02::fb): mDNS | ||
* 33:33:00:01:00:02 (ff02::1:2): DHCPv6 server/relay | * 33:33:00:01:00:02 (ff02::1:2): DHCPv6 server/relay | ||
===Locally-assigned Addresses=== | |||
If the penultimately-significant bit is 1, the address is "locally assigned" (read: made up). This is used by the Linux kernel's rand_hw_addr() function, used by PPP and TAP. | |||
==See Also== | |||
* [http://wiki.wireshark.org/Ethernet Ethernet page] on the Wireshark wiki | |||
* Ethernet is specified in the IEEE 802.3 [[standards]] | |||
* "[[Media:IEEE_802_10GBASE-T_Tutorial.pdf|IEEE 802 10GBASE-T Tutorial]]" from the IEEE working group, 2003 | |||
[[CATEGORY: Networking]] | [[CATEGORY: Networking]] | ||