All,
We should open this discussion to the ATM reflector for other possible
inputs.
Bob
From: Mike Steinberger [mailto:msteinb@xxxxxxxxxx]
Sent: Tuesday, July 14, 2015 2:14 PM
To: fangyi_rao@xxxxxxxxxxxx
Cc: wkatz@xxxxxxxxxx; Arpad_Muranyi@xxxxxxxxxx; msteinberger@xxxxxxxxxx;
michael.mirmak@xxxxxxxxx; bob@xxxxxxxxxxxxxxxxx
Subject: Re: The PAM4 BIRD 178 is not clear if PAM4_Mapping is Tx only, or
should it be allowed for Rx ...
Fangyi-
What data leads you to believe that PAM4 mapping mismatches are going to be
so rare that we should preclude the possibility of modeling them? I submit
that none of us have enough experience yet with PAM4 to make that
determination.
It might be perfectly reasonable to state that if the receiver mapping has
not been specified, it is assumed that the receiver will use the same
mapping as the transmitter. That would give us the simplicity you're looking
for without precluding other possibilities.
Mike S.
On 07/14/2015 04:08 PM, fangyi_rao@xxxxxxxxxxxx wrote:
My understanding is that PAM4_Mapping is only for Tx. I wouldn't worry too
much about different mappings between Tx and Rx. It's possible in theory,
but rare in reality.
Regards,
Fangyi
From: Mike Steinberger [mailto:msteinb@xxxxxxxxxx]
Sent: Tuesday, July 14, 2015 1:52 PM
To: Walter Katz
Cc: RAO,FANGYI (K-USA,ex1); Muranyi, Arpad; Mike Steinberger; Mirmak,
Michael; 'Bob Ross'
Subject: Re: The PAM4 BIRD 178 is not clear if PAM4_Mapping is Tx only, or
should it be allowed for Rx ...
Guys-
What would happen in the real silicon if the Tx used one mapping and the Rx
used another? (Answer: BER=0.5)
In the real silicon, is there any guarantee that the Tx and Rx are going to
use the same mapping? (Nope)
Our simulations should display the same behavior as the silicon.
In short, I strongly suggest that the PAM4 mapping needs to be defined for
both the transmitter and the receiver.
Mike S.
On 07/14/2015 02:31 PM, Walter Katz wrote:
Fangyi,
I have always assumed that PAM4_Mapping would be used in Tx .ami files only.
The BIRD is not explicit on this. Should we clarify this in the Editorial
work to make it Tx only. If we allow it for Rx, then we would somehow need
to make sure the Tx and Rx model used the same PAM4_Mapping. I would prefer
to make PAM4_Mapping Tx only. We would like to clarify this at the IBIS-ATM
meeting next week.
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
