This object denotes the value for the number
of IPDUs that must be acknowledged before the
working window size (Ww) can be incremented by
1 when the working window is not equal to the
maximum transmit window size (TW). It controls
the gradual incrementing of Ww in congestion
situations.
This function is not described in the IEEE
802.2 specification [5]. However, it is listed
in the IBM Token-Ring Network Architecture
Reference [6] as the Nw parameter and is widely
implemented.