VMS Help Sys Parameters, PASTIMOUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The basic interval at which the CI port driver wakes up to
    perform time-based bookkeeping operations. It is also the period
    after which a timeout is declared if no response to a start
    handshake datagram has been received.

    If CI or DSSI devices are not configured on your system, this
    parameter is ignored.

    The default value should always be adequate.

    PASTIMOUT is a DYNAMIC parameter.