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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. An earlier version of this presentation described several things for which FC-FS-3 references details or specific values in FC-PI-x. Some have been handled in FC-PI-x for years. Some are new for 16GFC.

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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 • An earlier version of this presentation described several things for which FC-FS-3 references details or specific values in FC-PI-x. • Some have been handled in FC-PI-x for years. • Some are new for 16GFC. • This presentation attempts to clarify the new ones. • It also corrects some names to better match IEEE 802.3:2008 terminology FC-PI-5, FC-FS-3, and 16GFC

  3. 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 64B/66B transmission code as its frame transfer transmission code.” (FC-FS-3 5.3.1) • This is new, there was never a choice before. • An implementation of a variant shall use 8B/10B if an FC-0 standard (e.g., FC-PI-4) does not specify a frame transfer transmission code for that variant. FC-PI-5, FC-FS-3, and 16GFC

  4. 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) • FC-PI-5 should select or reject for each 64B/66B physical variant • Transmitter Training Signal • Or it may simply say that all 64B/66B variants shall use the Transmitter Training Signal. FC-PI-5, FC-FS-3, and 16GFC

  5. If Speed Negotiation is supported… • “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

  6. 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

  7. 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 preset value, an initialize 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) • This author has recently been enlightened: the protocol for 16GFC Transmitter Training was intended to be based on the IEEE 802.3:2008 specification for the Physical Medium Dependent Sublayer and Baseband Medium, Type 10GBASE-KR PMD control function (IEEE 802.3:2008 subclause 72.6.10). FC-PI-5, FC-FS-3, and 16GFC

  8. If training of transmitter equalizer coefficients is supported • 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 • The preset value, to which it will be set for a Preset command • The initialize value, to which it will be set for an Initialize command • Its step size, by which it will be adjusted for an Increment or Decrement command • FC-PI-5 may decide how closely these follow IEEE 802.3. FC-PI-5 may even say some (or all?) of these parameters are vendor specific. FC-PI-5, FC-FS-3, and 16GFC

  9. Summary 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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