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[802.3ae] Clause 46.3.1.4 Draft 3.1

Hello,

Q1.
>From Clause 46.3.1.4 Draft 3.1 Page 270 , line 4 and 5,
it appears that the effective data rate control is achieved by dynamic
preamble shrinkage (i.e either one or two
32bit columns of preamble before start of  ethernet destination
address-as shown below)

 I column             II Column         III Column
   SOF                PRMBL               DA
   PRMBL              PRMBL               DA
   PRMBL              PRMBL               DA
   PRMBL              SFD                 DA
or
 I column            II Column
   SOF               DA
   PRMBL             DA
   PRMBL             DA
   SFD               DA

In draft 3.0 Clause 46.3.1.4 Draft 3.0 Page 251 , line 37and 38,
it appears that the effective data rate control is by dynamic addition
and deletion of IPG columns in between
ethernet frames(i.e the IPG columns will dynamically change to say 2 or
4 cloumns for a nominal 3 IPG
colmun(96bits).

Q2.
Is it mandatory to support effective data rate control only by dynamic
preamble column shrinkage?

Q3
Is it right to consider /T/ (End of Frame Character)as IPG octect?
(Minimum 5 octects IPG infers- one 32 bit column of IDLE and an octect
of /T/ ; refer 46.2.1 line 53)

Please clarify the observations and comment on the same.


regards
jacob

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