Defines  the  maximum  number  of  transport circuits that the
 local node can use.  Number must be in the range 1 to 32. If you
 receive an "INVALID VALUE" error, you probably have not allocated
 enough Non Paged Pool space.  You must lower the MAXIMUM CIRCUITS
 value or increase the VMS NPAGEDYN value.  See Chapter 5 of the
 Guide to Networking for some guidelines on NPAGEDYN.