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Apologies, I pushed send by accident. Additionally, I would state that some of the PMA electrical specifications have been tightened up, proposed to be tightened up (e.g., the transmit PSD), and better defined. The PMA electricals are defined at TC1/TC2 – different from the
(not well defined) MDI on clause 147. We still need to specify a crosstalk performance spec, which isn’t defined for multidrop mode in clause 147. Other things have been proposed (such as a relaxation of the receive-mode collision requirement to a “should” – see
https://www.ieee802.org/3/da/public/0523/beruto_3da_20230515_carrier_sense_1p1.pdf ), these could make clause 168 not necessarily compliant with clause 147, but not materially different, IMHO, and we could adjust clause 147 by maintenance or within our
amendment to maintain compliance. However, while the text of the spec requires a new clause (largely because of the intermingling of point-to-point and multidrop functionality in the clause 147 text), nothing is fundamentally changed in the phy type. There are substantial
changes in the link segment specification, which is indicated by the title of the amendment. The 10BASE-T1M isn’t a new phy type from what I know exists with clause 147 in any real sense – it only differs in a specification sense, enabling, and better defining
the multidrop mode of operation. I think this will become painfully clear when we process the PICS… George Zimmerman, Ph.D. President & Principal CME Consulting, Inc. Experts in Advanced PHYsical Communications 310-920-3860 From: George Zimmerman
All – I received more than a few questions this week regarding the differences between the clause 168 phy spec and the clause 147 phy spec. I believe that the clause 168 phy spec is better defined, with more specificity, and that a clause
168 phy would comply with clause 147 in multidrop mode (but not in the mandatory point-to-point half-duplex mode). The mixing segment and MDI/TCI specs are different. The state diagrams are different, because we have pared out the non-multidrop branches,
and we have eliminated the heartbeat and link monitor functions. George Zimmerman, Ph.D. President & Principal CME Consulting, Inc. Experts in Advanced PHYsical Communications 310-920-3860 To unsubscribe from the STDS-802-3-SPMD list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-SPMD&A=1 |