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Re: [802.3_DWDM] Link degrade - Comment #246

Hi,

 

I updated the presentation according with Gary’s comments.

 

Please review and let me know if it is OK with you or if you have any comments, and if you want to be listed as a co-author/supporter.

 

Best regards,

Leon

 

From: Gary Nicholl (gnicholl) <gnicholl@xxxxxxxxx>
Sent: יום ב 05 יוני 2023 17:48
To: Leon Bruckman <leon.bruckman@xxxxxxxxxx>; STDS-802-3-DWDM@xxxxxxxxxxxxxxxxx
Cc: ofelt@xxxxxxxxxxx; jmaki@xxxxxxxxxxx
Subject: RE: Link degrade - Comment #246

 

Leon,

 

I made some updates in the attached.

 

I think basically the FEC degrade signaling should be identical to that for 400GbE as described in Clause 116, 118 and 119, with the following exceptions:

 

  • PCS (local degrade) : am_sf<1>  is replaced by STAT<7>
  • PCS (remote degrade): am_sf<2> is replaced by STAT<6>

 

I split your slide 2 into two new slides (slide 3 and 4 in the attached) to separate the local and remote degrade signaling as was done in Clause 116 (see Figure 116-7 and Figure 116-8)

 

I also cc’ed Dave and Jeff who were heavily involved with the definition of FEC degrade signaling in 3bs,  to make sure I didn’t miss something !

 

Gary

 

 

From: Leon Bruckman <0000177f9242b9c8-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, June 5, 2023 2:54 AM
To: STDS-802-3-DWDM@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_DWDM] Link degrade - Comment #246

 

Hi,

 

Attached are a couple of slides that show how the degrade indications flow according to my proposal below.

 

Best regards,

Leon

 

From: Leon Bruckman <0000177f9242b9c8-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: יום א 04 יוני 2023 11:56
To: STDS-802-3-DWDM@xxxxxxxxxxxxxxxxx
Subject: [802.3_DWDM] Link degrade - Comment #246

 

Hi,

 

Regarding the local and remote degrade issue, related with comment #246 from Eric.

 

Note that the draft does include a FEC_degraded_SER indication (see Table 155–9—MDIO/PCS and PMA status variable mapping).

 

My updated proposed resolution:

 

  • Transmit STAT
    • Actual text in 155.2.5.5.2:

 

If there is an adjacent PHY 400GXS sublayer then the value of remote degrade in STAT<6> is equal to the value of rx_am_sf<2> from the 400GXS sublayer, and local degrade in STAT<7> is equal to the value of rx_am_sf<1> from the 400GXS sublayer.

 

If there is no adjacent PHY 400GXS sublayer, meaning that the 400GBASE-ZR PCS is directly connected to a MAC-RS, then the value of remote degrade in STAT<6> is set to the value of local degrade in STAT<6> of the received status octet in the receive direction of the 400GBASE-ZR PCS, and the value of local degrade in STAT<7> in the transmit direction is set to 0.

 

    • Change to:

 

If there is an adjacent PHY 400GXS sublayer then the value of remote degrade in STAT<6> is set to 1 if rx_am_sf<2> from the 400GXS sublayer is set to 1 or FEC_degraded_SER is set, and to 0 otherwise, and the value of local degrade in STAT<7> is set to the value of rx_am_sf<1> from the 400GXS sublayer.

 

If there is no adjacent PHY 400GXS sublayer, meaning that the 400GBASE-ZR PCS is directly connected to a MAC-RS, then the value of remote degrade in STAT<6> is set to one if STAT<7> of the received status octet in the receive direction of the 400GBASE-ZR PCS is set to 1 or FEC_degraded_SER is set, and to 0 otherwise, and the value of local degrade in STAT<7> is set to 0.

 

  • Receive STAT
    • Actual text in 155.2.6.7.2:

 

If there is an adjacent PHY 400GXS sublayer, then the value of remote degrade in the received STAT<6> is passed to tx_am_sf<2> in the transmit direction of the 400GXS sublayer, and local degrade in STAT<7> is passed to tx_am_sf<1> in the transmit direction of the 400GXS sublayer.

 

If there is no adjacent PHY 400GXS sublayer, meaning that the 400GBASE-ZR PCS is connected to a MAC-RS, then the value of remote degrade in STAT<6> is passed to the DTE management entity to indicate a remote degrade event, and local degrade in the received STAT<7> is passed to the remote degrade bit in STAT<7> in the transmit direction of the 400GBASE-ZR PCS.

 

    • Change to:

 

If there is an adjacent PHY 400GXS sublayer, then the value of remote degrade in the received STAT<6> is passed to tx_am_sf<2> in the transmit direction of the 400GXS sublayer, and tx_am_sf<1> in the transmit direction of the 400GXS sublayer is set to one if local degrade in STAT<7> is set to 1 or FEC_degraded_SER is set, and to 0 otherwise.

 

If there is no adjacent PHY 400GXS sublayer, meaning that the 400GBASE-ZR PCS is connected to a MAC-RS, then the value of remote degrade in STAT<6> is passed to the DTE management entity to indicate a remote degrade event, and local degrade in the received STAT<7> is passed to the transmit direction of the 400GBASE-ZR PCS.

 

Please let us now your opinion

 

Leon

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Attachment: bruckman_3cw_01_010623.pptx
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