Everything you wanted to know about Link Layer Adaptation

This is a skeleton for the fully-expanded page

Linked from: http://www.bufferbloat.net/projects/cerowrt/wiki/Setting_up_AQM_for_CeroWrt_310

However, certain link types have smaller overheads, and if you can ascertain your link types (whether it’s LLC or VC-Mux based), you can use these smaller overheads: Try one of the Tests for Bufferbloat after making the change.

LLC-based Overheads:

  • PPPoA - 14 (PPP - 2, ATM - 12)
  • PPPoE - 40+ (PPPoE - 8, ATM - 18, ethernet 14, possibly FCS - 4+padding)
  • Bridged - 32 (ATM - 18, ethernet 14, possibly FCS - 4+padding)
  • IPoA - 16 (ATM - 16)

VC-Mux based Overheads:

  • PPPoA - 10 (PPP - 2, ATM - 8)
  • PPPoE - 32+ (PPPoE - 8, ATM - 10, ethernet 14, possibly FCS - 4+padding)
  • Bridged - 24+ (ATM - 10, ethernet 14, possibly FCS - 4+padding)
  • IPoA - 8 (ATM - 8)

Need to incorporate some discussion of VDSL?

To edit this page, submit a pull request to the Github repository.
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