Library /sys$common/syshlp/ncphelp.hlb SET, MODULE, X25-PROTOCOL, KNOWN_DTES, MAXIMUM RESTARTS count  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specifies the maximum number of attempts to restart an X.25
 virtual  circuit. Specify a value in the range 1 to 255.  By
 default, the count takes the network value specified by the
 PROFILE parameter.  See the Public Network Information manual for
 the network value of this parameter.