A relatively new
 concept. Based on flow control from the network (employing Resource Management =
 RM cells). In ABR, we need to specify the following traffic
 parameters: 
 -  Peak Cell
 Rate
 (PCR)
 -  Minimum Cell Rate
 (MCR)
 MCR is a bound (0 < MCR < PCR) on the
 cell rate that the network should support. However, the cell rate of the source is allowed to
 vary between 0 … PCR.
 Typical applications:
 
 -  LAN emulation / LAN
 interconnection
 -  File transfer (critical
 applications)