/PATH=(n1[.n2.n3.n4.n5.n6])

    Specifies the path to the device on the bus. The path is used
    to identify a device uniquely if the device does not have a
    serial number. The path specification is a series of six or fewer
    nonzero numbers,

    where:

    n1               is the number of the port on the root hub (at
                     tier 0).

    n2 through n6    are port numbers for downstream hubs at tiers 1,
                     2, 3, 4, and 5. (If you do not specify trailing
                     zeros, the UCM server supplies them.)

    For example, /PATH=1.4.3 indicates that the device is plugged
    into port 3 of the second tier hub, which is plugged into port 4
    of the first tier hub, which in turn is plugged into the root hub
    1.

    For a more detailed explanation of path specifications, see
    <REFERENCE>(tiers) and the text that introduces the figure.