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Phy Compatibility

Jim Brotton
Prodigy 30 points
Other Parts Discussed in Thread: TLK1501, TLK1221

I am looking at a new product design which takes in 10GB Ethernet and distributes to a number of other elements.

Current plan is to use a TLK2208 or equivalent on the main board talking to a series of TLK1501 at 1.2GB. It looks as though the 2 sides of the equation are compatible, but only one side refers to 802.3.

Anyone any experience of using this type of pairing?

Jim

  • 0
    TI__Mastermind 20820 points

    Hi Jim,

    It is unclear to me what you are attempting to do in this design with the parts that you have selected to use. The TLK2208 supports 8 ports of gigabit Ethernet, not 10 gigabit Ethernet. Are you just trying to see if you can get a gigabit serial link up between TLK2208 and TLK1501?  If so, one issue with the TLK1501 here is that, while it supports 8b/10b encoding, it doesn’t have the full control code set specified in 802.3. Here is a thread for reference: http://e2e.ti.com/support/interface/high_speed_interface/f/138/p/96931/338828.aspx#338828.

    Are you looking for more of an agitator type SerDes device that will take several low speed lanes and aggregate them up to a 10 Gbps link and perform the opposite operation?

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Prodigy 30 points

    Hi Mike, thanks for the reply

    The systems will have a 10GB link to a PC and demux this to 8 channels running at 1MB, so I was looking at the 2208 to drive the individual channels. We already have USB2 and USB3 version of this and I am looking at the next gen. The 2208 drives 8 channels and I was trying to find a compatible single (in fact I probably need dual) channel phy for the remote end:

    PC -> 10GB ->  PCB -> 8 x 1GB -> 1GB in and out.

    Hope this helps,

    Jim

  • 0 in reply to Jim Brotton
    TI__Mastermind 20820 points

    HI Jim,

    Is your application going to implementing Base-T signaling or Base - X? The TLK2208 is intended handle the BASE-X interface type, which is used to transmit NRZ signals over optical fiber, balanced copper twinaxial/coaxial cabling, or copper backplanes. If 1GbE Base-X will work for your application, then I would look at TLK1221, TLK1201A, or TLK2210B for the single channel solution and TLK2218 for the octal. I suspect TLK1221 would be the cheapest solution. There may be some other solutions that we can recommend here once you clarify for me if the application is Base-T or Base-X?

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Prodigy 30 points

    Hi Mike

    I was initially looking at the physical layer so hadn't considered the 2 options. We currently use LVDS @ 300MB using serdes and our own protocol. For the GB we could use our own protocol over an existing physical layer but it would probably make more sense to use a standard even if it is not quite as efficient.

    We certainly need to isolate the 2 ends and we currently use CAT6A so I am thinking the 1000BASE-T looks the more obvious choice?

    ATB

    Jim