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Hi Brain, PHY frame alignment is achieved by using the training frame. Considering that PHY frame when FEC is used corresponds to four partial frames, it is better to set the 2nd bit in every
4 partial PHY frames to 1. In this way, the PHY frame in both modes can be aligned. This also allows the same InfoField header as Clauses 55, 97, 149, and 165. In terms of PHY control for 100BASE-T1L, using timers during the first stage of training for stable timing lock and transmitting PHY capability bits after the receiver is fully
up is useful to improve training efficiency. Transmitting the training frame with InfoField allows different states to share the logic at the maximum. Besides, partial frame counter (PFC24) and DataSwPFC24 enables reliable, fast, and accurate recognition of
format switching and is more robust to bit errors due to the regular value and transmitting PAM2. It is still beneficial to 100BASE-T1L with LONG system reach. Therefore, PHY Control for 100BASE-T1L can be still similar to Clauses 97, 149, and 165 but take
the following small modifications to achieve the aforementioned advantages.
1.
Introducing timers to the Master and Slave TRAINING state (PMA_state=00), ensuring sufficient time to achieve stable timing lock. The timing_lock bit in the Slave Message
field can be replaced by a reserved bit 0.
2.
After both receivers are fully up, PHY capability bits and PFC24 are transmitted to improve training efficiency. The CAPABILITY EXCHANGE state with a new PMA_state=10
is added between TRAINING and COUNTDOWN.
3.
As long as one valid InfoField containing PHY capability bits is received, it moves to COUNTDOWN. DataSwPFC24 can be greatly reduced to e.g. 128. More details of the PHY Control idea can be found on my second presentation on the website. We can also discuss this during the meeting. Best wishes, Tingting 发件人: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx>
All ? I have updated the 802.3dg website with the unconfirmed minutes from Wednesday, the presentations and proposed motions for next week, and the presentations received so far for next week. I have also uploaded a
new version of the draft to the private area (d0p2). Still waiting for the final agenda for our joint meeting and the editor’s report. George A. Zimmerman, Ph.D. Chair, IEEE P802.3dg 100BASE-T1L Task Force 2nd Vice Chair, IEEE 802 LAN/MAN Standards Committee CME Consulting, Inc. 1-310-920-3860 To unsubscribe from the STDS-802-3-SPEP2P list, click the following link:
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