Library /sys$common/syshlp/ncphelp.hlb SET, NODE, SERVICE DEVICE device-type  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Identifies the target node's line controller for the service circuit
 over which the operation is to take place.  See HELP PARAMETERS
 DEVICE-TYPE for a list of circuit and line devices.

 Only the synchronous port on the DMF service device may be used.