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FC-PI-5, FC-FS-3, and 16GFC

FC-PI-5, FC-FS-3, and 16GFC. bob.nixon@emulex.com. Hot Potatoes. In the course of developing the 16GFC protocols, several things were determined to be out of scope for an FC-1/FC-2 standard So, we’re trying to dump them on FC-PI-x…. Bit Sync and Loss-of-Signal.

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FC-PI-5, FC-FS-3, and 16GFC

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  1. FC-PI-5, FC-FS-3, and 16GFC bob.nixon@emulex.com FC-PI-5, FC-FS-3, and 16GFC

  2. Hot Potatoes • In the course of developing the 16GFC protocols, several things were determined to be out of scope for an FC-1/FC-2 standard • So, we’re trying to dump them on FC-PI-x… FC-PI-5, FC-FS-3, and 16GFC

  3. Bit Sync and Loss-of-Signal • “Bit Synchronization is defined in FC-PI-x.” (FC-FS-3 6.2) • “A receiver may provide a Loss-of-Signal check”, though it is optional (FC-FS-3 6.3.4.2) • PI has always done that for us, please do the same for 16GFC. FC-PI-5, FC-FS-3, and 16GFC

  4. Selection of Transmission Code • “An FC-0 standard (e.g., FC-PI-5) may specify the use of the 8B/10B transmission code as its frame transfer transmission code.” (FC-FS-3 5.2.1) • “An FC-0 standard (e.g., FC-PI-5) may specify the use of the 8B/10B transmission code as its frame transfer transmission code.” (FC-FS-3 5.3.1) • This is new, there was never a choice before. • FC-PI-5 should select 64B/66B for each physical variant that does NOT use 8B/10B. FC-PI-5, FC-FS-3, and 16GFC

  5. If Transmission Code is 8B/10B • “An FC-0 standard (e.g., FC-PI-5) may specify the use of Emission Lowering Protocol when using the 8B/10B transmission code.” (FC-FS-3 10.3.5) • “An FC-0 standard (e.g., FC-PI-5) may specify the use of Frame Scrambling when using the 8B/10B transmission code.” (FC-FS-3 10.3.6) • FC-PI-5 should select for each 8B/10B physical variant that uses it • Frame Scrambling • Emission Lowering Protocol (default is neither will be used) • PI has been doing this for 8GFC, nothing new needed. FC-PI-5, FC-FS-3, and 16GFC

  6. If Transmission Code is 64B/66B • “An FC-0 standard (e.g., FC-PI-5) may specify the use of the Transmitter Training Signal….” (FC-FS-3 5.4.1) • Implicitly, Speed Negotiation support depends on physical variant specs. I don’t think we have bothered to explicitly say yes or no per physical variant before, so I don’t see that we need to start now. • FC-PI-5 should select or reject for each 64B/66B physical variant • Transmitter Training Signal FC-PI-5, FC-FS-3, and 16GFC

  7. If Speed Negotiation is supported… • …and the variant does not take the 1 millisecond default • “For any variant that does not specify a Transmitter Stabilization Time, including those specified in FC-PI-2, FC-PI-3, FC-PI-4, 10GFC, the Transmitter Stabilization Time shall be one millisecond.” (FC-FS-3 8.6.6) • “For any variant that does not specify a Receiver Stabilization Time, including those specified in FC-PI-2, FC-PI-3, FC-PI-4, 10GFC, the Receiver Stabilization Time shall be one millisecond.” (FC-FS-3 8.6.6) • FC-PI-5 should specify for each physical variant that can not stabilize a signal in one millisecond: • Receiver Stabilization Time • Transmitter Stabilization Time FC-PI-5, FC-FS-3, and 16GFC

  8. If Transmitter Training Signal is supported • “Transmitter training negotiates either or both of two capabilities between the transmitters and receivers connected by a link: a) values of transmitter equalizer coefficients that result in most reliable signal reception across the link; and b) use of FEC.” (FC-FS-3 9.2) • FC-PI-5 should select, reject, or make optional for each physical variant that supports the Transmitter Training Signal • training of transmitter equalizer coefficients • Forward Error Correction (FEC ) FC-PI-5, FC-FS-3, and 16GFC

  9. If training of transmitter equalizer coefficients is supported • “The use of each coefficient is specified by FC-PI-x for each FC-0 variant that supports transmitter training. Each coefficient in the model has a minimum value, a maximum value, a default value, a preset value, and a step size by which it may be adjusted. These values are specified by FC-PI-x for each FC-0 physical variant that supports transmitter training.” (FC-FS-3 9.2) • FC-PI-5 should specify for each physical variant that supports coefficient training, the following for coefficients 0, 1, and 2: • What it does (if anything) • Its minimum value • Its maximum value • Its default value • Its preset value • Its step size FC-PI-5, FC-FS-3, and 16GFC

  10. That ought to do it Questions? FC-PI-5, FC-FS-3, and 16GFC

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