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Asymmetric PAUSE

2007.09.12 13:30 : 네떡
• 802.3x defines extensions to Clause 28 that allows configuration of PAUSE function
• The single bit definition only supports symmetric PAUSE ability
  • PAUSE=1 means "I can transmit & receive PAUSE frames"
  • PAUSE=0 means "Not only can’t I transmit PAUSE frames, but I won’t understand them"
  • Turn on PAUSE functionality only if PAUSE=1 on both ends
• Asymmetric PAUSE requires an additional bit
• Solution: Add ASM_DIR bit
  • PAUSE=0, ASM_DIR=1 -> Advertises transmitter but no receiver
  • PAUSE=1, ASM_DIR=1 -> Advertises receiver but no transmitter

asym.pdf
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