Maintenance Adhoc Overview Jeff Mandin PMC-Sierra July 2008.

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Presentation transcript:

Maintenance Adhoc Overview Jeff Mandin PMC-Sierra July 2008

802.3 Maintenance Adhoc2 Background describes two different interfaces to the MAC: a)MA_DATA.Request/Indication in Clause 2 -This is the ISO/IEC/802.1 interface b)TransmitFrame()/ReceiveFrame() in Clause 4 2.In 802.3as it was determined that this “longstanding discrepancy” between the interface definitions should be remedied -“Service to humanity” -MAC Control sublayer no longer an “optional” sublayer inside the MAC but instead a MAC client -State diagram added to reconcile MA_DATA.Request with TransmitFrame() -MAC Control Clauses (31, 31B, 64) were modified to use the Clause 2 “service interface primitives” instead of the TransmitFrame()/ReceiveFrame() “functions”

July Maintenance Adhoc : MAC Control sublayer is part of MAC

July Maintenance Adhoc ay D2.3: MAC Control sublayer no longer part of MAC

July Maintenance Adhoc5 State diagram from Clause 4 (802.3ay D2.2)

July Maintenance Adhoc6 An instance of impact on MAC Control that wasn’t recognized (Maint #1196) 1.There are cases where the TransmitFrame() function cannot simply be replaced by the MA_DATA.Request() primitive -TransmitFrame() has “duration” ie. it does not complete until all supplied bits are transferred to the PHY 2.Clause 64 (Multipoint MAC Control) specifies the “Control Multiplexer” – which transmits frames to the MAC with extra gap time after IPG to enable the PHY to include FEC parity 3.In , the Control Multiplexer relies on the duration of TransmitFrame() as part of its calculations of gap time -When TransmitFrame() is replaced by MA_Data.Request(), this calculation needs to be modified

July Maintenance Adhoc7 MPCP Control Multiplexer

July Maintenance Adhoc8 Questions for the adhoc 1.Are there other instances in the MAC Control clauses (or elsewhere) that were affected by the MAC interface change? -eg. Is the PAUSE operation transmit state diagram in figure 31B-1 in need of modification? 2.Is there a need to reevaluate the MAC interface changes affecting MAC Control?

July Maintenance Adhoc9 Backup

July Maintenance Adhoc10 PAUSE Operation Transmit State Diagram (Figure 31B-1)

July Maintenance Adhoc11 OAM Multiplexer State Diagram (Figure 57-7)