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RE: [802.3ae] Interpacket gap

The interFrameGap specification is now in bits and is 96 bits for 10 Gb/s
just as it was at lower speeds.  There are a couple  of significant
differences at 10 Gb/s though.  

1.  The Reconciliation sublayer will align the start of frames on 32 bit
word boundaries.  At maximum frame rate, the average IPG will be preserved,
but the number of IPG bits observed at the MDI may be less or greater than

2. A capability to lengthen the IPG has been added.  When connected to a WAN
PHY, the ifStretchRatio will cause longer IPG to be generated so that the
effective data rate of the MAC allows a maximum rate string of any size of
frames to be mapped into a STS-192c/SDH VC-4-64c payload.  

--Bob Grow

-----Original Message-----
From: Pete Morrissey [mailto:pmorrissey@xxxxxxx]
Sent: Friday, June 07, 2002 10:07 AM
To: stds-802-3-hssg@xxxxxxxx
Subject: [802.3ae] Interpacket gap

Could someone tell me what the Interpacket gap is
for 10 Gig? I'm guessing that it is 96 nanoseconds.

Also, if this isn't the right place to ask, just tell
me where to go.


Pete Morrissey
Network Computing Magazine