This attribute specifies the maximum number of sequentially
numbered Information (I) frames that may be outstanding (that is,
unacknowledged) at any given time from the IWF to the mobile
station. GSM specification 4.22 defines the range as 0 to 61.
During the Exchange Information (XID) negotiation, both Radio
Link Protocol (RLP) entities (mobile station and IWF) can agree to
use a specific window size. The IWF attempts to negotiate to the
value specified by this attribute.
The negotiated value can be viewed in the component
GsmIwfRlpOp attribute iwfToMsWindowSize.
Changes to this attribute do not effect existing calls.