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1000BASE-BX

Wenjun Huang
Expert 1770 points

Other Parts Discussed in Thread: TLK2201B

Does anyone know how to design for 1000BASE-BX?

Is 1000BASE-BX fiber optic Ethernet? Could it be routed through the backplane, or only come out through fiber optic SFP?

Is there any Ethernet PHY suitable for 1000BASE-BX

  • 0
    Mastermind 7395 points

    1000BASE-BX is indeed for fiber communications

    If you need to implement in a backplane, consider using 1000BASE-T which has a long experience on backplanes, including base fabric for ATCA.

  • 0
    TI__Expert 7850 points

    Wenjun,

    As mentioned before, 1000Base-BX is a part of the Gigabit Ethernet standard related to transmission over fiber optic cable.  Typically, the electrical serial data signal feeding the optical module is coming from a serializer/de-serializer (SerDes) device.  If  the SerDes is like TI's TLK2201B (1G Ethernet SerDes)  then the serial output of the SerDes can be driven over a backplane.  SerDes that  incorporate 1000BaseT functionality use multi-level signaling that is more optimal for cable based Ethernet links.

    Thanks,

    Atul Patel

    Texas Instruments

  • 0 in reply to Atul Patel
    Expert 1770 points

    Yes. Actually 1000BASE-BX is the Gigabit Ethernet protocol used for openVPX, VITA65, a backplane technology created by VITA committee. I m now trying to design a card that will provide 1000BASE-BX Ethernet that will be routed through the backplane to another card at a different slot.

    Does TI have a recommended Ethernet PHY for 1000BASE-BX?

  • 0 in reply to Wenjun Huang
    Prodigy 20 points

    Hello Atul & Wenjun, what was the solution for 1000BASE-BX on a VITA65 backplane.  Was a TLK2201B used?  Can two modules in a OpenVPX backplane interface directly using 1000BASE-BX without a PHY?  Thank you.

  • 0 in reply to Nic Norbert
    Expert 1770 points

    I am actually guessing that 1000BASE-X can be used for 1000BASE-BX since they are all fiber standard, uses 4 wires (2 pairs of differential signals) vs 8 wires for 1000BASE-T which is twisted pair interface.

  • 0 in reply to Wenjun Huang
    Prodigy 20 points

    Thanks. How should the physical interface be implemented across the backplane?  If they are SerDes, do I need a PHY on the BP or can I run the traces directly between modules? Unlike a traditional 1000BASE-BX interface, I do not intend to route the board traces to an SFP type interface. 

  • 0 in reply to Nic Norbert
    Expert 1770 points

    I think u will have 2 plug-in cards. Use 1000BASE-X PHYs on both the plug-in card. The backplane should be just routing. The connection is:

    MAC -> PHY -> VPX connector -> backplane -> VPX connector -> PHY -> MAC

  • 0 in reply to Wenjun Huang
    Mastermind 7395 points

    I don't know of no case where an active backplane is used. Think that if any of the active elements in the backplane failed, you would have to disassemble all the cards to dismount the backplane, a huge time for system down and an operation that cannot be made at the field anyway. People think it twice even to include resistors or capacitors in a BP... active devices in a BP are 99% out of the question.