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RE: RS minimum IPG


I can't quite parse what you've said. In any case, Shimon has pointed out
where it is specified in 4.4.2. Note that the numbers in 4.4.2 are

   10 Mb/s   47 BT
   100 Mb/s  not specified 
   1 Gb/s    64 BT
   10 Gb/s   40 BT (= 5 Phy characters)

As you can see, consistancy between speeds was not particularly a goal.


-----Original Message-----
From: Sanjeev Mahalawat [mailto:sanjeev@xxxxxxxxx]
Sent: Tuesday, February 20, 2001 12:45 PM
To: pat_thaler@xxxxxxxxxxx; pat_thaler@xxxxxxxxxxx; sanjeev@xxxxxxxxx;
stds-802-3-hssg@xxxxxxxx; yariv@xxxxxxxxxxxxx
Subject: RE: RS minimum IPG

At 01:10 PM 02/20/2001 -0700, pat_thaler@xxxxxxxxxxx wrote:
>I dashed off my response too quickly. I meant to say "I don't know of
>anyplace a minimum receive IPG of 4 is stated for 10 Gb/s."

The original question was why everybody is talking about 
shrinking the IPG to 4 bytes. The receive IPG is never shrinked
to 4 bytes and and it is never less than 5 bytes at RS receive
for explained or unexplaned reasons, it is an issue that 
specify the preamble and the min IPG that 
are "consistence" with the slower speeds those are 4 bytes
min IPG and SFD at RS. I am not sure of you chasing the the place.


>-----Original Message-----
>From: pat_thaler@xxxxxxxxxxx [mailto:pat_thaler@xxxxxxxxxxx]
>Sent: Tuesday, February 20, 2001 9:48 AM
>To: sanjeev@xxxxxxxxx; stds-802-3-hssg@xxxxxxxx; yariv@xxxxxxxxxxxxx
>Subject: RE: RS minimum IPG
>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. 
>-----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