The initial circuit receive pacing window size, in the unit
of SSP messages, to be used for future transport connections
activated using this table row. The managed node sends this
value as its initial receive pacing window in its initial
capabilities exchange message. Changing this value does not
affect the initial circuit receive pacing window size of
currently active transport connections. If the standard window
pacing scheme is not supported, the value is zero.
A larger receive window value may be appropriate for partners
that are reachable only via physical paths that have longer
network delays.