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

    Tru64 UNIX Default: 1023       Tru64 UNIX Value: 1-1023

    OpenVMS Default: 4294967295    OpenVMS Value: 1-4294967295

    When operating over the Connection-Oriented Network Service
    (CONS), the maximum number of transport connections that can be
    multiplexed on any single network connection. This characteristic
    can be increased only when the transport entity is enabled.
    You can modify this characteristic to a lower value only when
    the entity is disabled. See X.25/CONS Configuration for more
    information.

    set [node node-id] osi transport maximum multiplexing integer

    Example:

    set osi transport maximum multiplexing 4294967295