Rate Increase Factor: Controls the rate increase which occurs when a backward RM-cell is received with CI=0 and NI=0. Larger values lead to faster rate increase This factor is applied at both the local and remote endpoints, thus making the loop control symmetrical. Backward RM cells at the local endpoint correspond to RM cells received in the remote->local direction. Backward RM cells at the remote endpoint correspond to RM cells received in the local->remote direction.