Transcript FS-3 needs from PI

FC-PI-5, FC-FS-3, and 16GFC
[email protected]
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
1
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…
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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.
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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.
• FC-PI-5 should select 64B/66B for each physical variant that
does NOT use 8B/10B.
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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.” (FCFS-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.
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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-FS3 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
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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 )
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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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
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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That ought to do it
Questions?
T11/09-506v1 - 9/1/2009
FC-PI-5, FC-FS-3, and 16GFC
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