Library /sys$common/syshlp/nclhelp.hlb set, x25_protocol, dte, link_service_provider  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: No link       Value: local entity name
    service provider name

    Name of the link service provider entity used by the DTE.
    You must give this characteristic a value before you enable
    the DTE.

    Example:

    set x25 protocol dte dte-1 -
          link service provider lapb link link-0