RE: RS minimum IPG
Pat,
I think you have explained what you had asked me for.
Thanks
-Sanjeev
At 11:41 AM 02/20/2001 -0700, pat_thaler@xxxxxxxxxxx wrote:
>It occurs to me that one source of confusion may be on how to count the IPG.
>The IPG includes the /T/. A minimum IPG of 5 characters is a /T/ plus 4
>/I/s.
>Currently, clause 49 states that the minimum is 5 /I/s but I have submitted
>a comment to change that to 4.
>
>10GBASE-R requires that minimum IPG for encoding. With an IPG of 5, a start
>and terminate never fall within the same block.
>
>10GBASE-X requires that minimum for disparity checking. The check_end
>function returns an error if the column after the ||T|| is neither ||A|| nor
>||K||.
>
>Regards,
>Pat
>
>-----Original Message-----
>From: THALER,PAT (A-Roseville,ex1)
>Sent: Tuesday, February 20, 2001 9:48 AM
>To: 'Sanjeev Mahalawat'; stds-802-3-hssg@xxxxxxxx; yariv@xxxxxxxxxxxxx
>Subject: RE: RS minimum IPG
>
>
>Sanjeev,
>
>Where do you find such a definition in the standard? I don't know of
>anyplace a minimum receive IPG of 5 is stated. Further, that is a parameter
>that has varied based on speed so what it was at 100/1000 Mb/s does not
>limit our choice at 10 Gig.
>
>Regards,
>Pat
>
>-----Original Message-----
>From: Sanjeev Mahalawat [mailto:sanjeev@xxxxxxxxx]
>Sent: Monday, February 19, 2001 11:25 AM
>To: stds-802-3-hssg@xxxxxxxx; yariv@xxxxxxxxxxxxx
>Subject: Re: RS minimum IPG
>
>
>
>The min IPG varies from 9 bytes to 15 bytes
>based on the packet size and due to clock compensation
>the PHY may delete a column that will lead to min
>IPG of 5 Bytes. So, thoeritically it should not be
>less than 5 bytes but the spec. always defines it
>to be 4 bytes as this was in the 100/1000 mbps
>specs.
>
>Thanks
>-Sanjeev
>