The term MLPPPoX is used to reference MLPPP sessions over ATM transport (oA), Ethernet over ATM transport (oEoA) or Ethernet transport (oE). Although MLPPP in subscriber management context is not supported natively over PPP/HDLC links, the terms MLPPP and MLPPPoX terms can be used interchangeably. The reason for this is that link bundling, MLPPP encapsulation, fragmentation and interleaving can be in a broader scope observed independently of the transport in the first mile. However, MLPPPoX terminology prevails in this section in an effort to distinguish MLPPP functionality on an ASAP MDA (outside of ESM) and MLPPPoX in LNS (inside of ESM).
The terms speed and rate are interchangeably used throughout this section. Usually, speed refers to the speed of the link in general context (high or low) while rate quantitatively describes the link speed and associates it with the specific value in b/s.