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Talk:10 Gigabit Ethernet

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This is an old revision of this page, as edited by 132.177.124.104 (talk) at 18:23, 16 July 2006. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

This article says

Unlike earlier Ethernet systems, 10-gigabit Ethernet (for any nontrivial distance) is so far based entirely on the use of optical fibre connections

although there is 10GBASE-CX4 -- Copper interface using InfiniBand CX4 cables and InfiniBand 4x connectors for short-reach (15 m maximum) applications mentioned... copper implies copper, not fiber.... so is there a mistake? --Abdull 12:12, 17 Mar 2005 (UTC)

  • The first 10GbE IEEE spec (802.3ae) did not support any copper (other than MAC to PHY interconnects). CX4 was added later in IEEE P802.3ak. You can also run XAUI for about 20 inches on copper or printed circuit board. I am not not sure what the "nontrivial distance" comment is referring too because CX4 can be 25m, so I assume that comment was referring to XAUI and is no longer true in light of CX4 and will definitely need deleting when 10GBASE-T is ratified. Patrick0101 20:33, 19 May 2005 (UTC)[reply]
  • Non-trivial means greater than the reach of CX4. I think this paragraph should be changed to "Unlike earlier Ethernet systems, 10 gigabit Ethernet was initially based mostly on the use of optical fiber connections. More recent developments introduced 10GBASE-CX4 for links up to 25m over Infiniband cable; and work is progressing on 10GBASE-T to allow links up to 100m over UTP." Thoughts? Andybryant 19:46, 16 June 2006 (UTC)[reply]

I searched everywhere for the clock rate of the 10GbE. I've just found in a datasheet of one transceiver vendor: 10.3125 Gbps, but I don't know how and where to put it in the text... Akira - Cleber Akira Nakandakare 12:15, 23 May 2005 (UTC)[reply]

  • This is the bit rate for the LAN PHY varient of 10GbE. The 10GBase-xW varients run at the SDH/SONET rate of 9.953 Gbps. I've made this change to the page. The only thing I'm not sure about is if LX4 is LAN PHY or not. Andybryant 19:46, 16 June 2006 (UTC)[reply]

The baud rate for each lane of CX4 is 3.125 GHz implying that with four lanes it's possible to transmit 12.5 Gbps though I know a large portion is lost by the 8b10b Clause 48 PCS conversion meaning ideal spead would be 10Gbps (8/10 * 12.5).

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