The 'Physical Path of the LANIC' is a parameter entered when configuring
DTS(Datacommunications and Terminal Subsystem) in NMMGR.
Run NMMGR; then f1(open config); then f1(DTS). This will display 'your'
physical path.
Refer to HP manual 'Configuring Systems for Terminals, Printers, and
Other Serial Devices'. Here's the verbatim :
CONFIGURATION PARAMETER: Physical Path of LANIC (Slot # of LANIC Card)
DESCRIPTION: The location of the LANIC(LAN Interface Controller Card) in
the system's backplane. The LANIC is an input/output(I/O) card that
plugs into the Channel I/O Bus (CIB)(or the HP Precision Bus for NIO
LANICs) of the HP3000 computer. The location (slot number) of the LANIC
within the cabinet must be specified.
The default physical paths (slot numbers) for HP3000 computers are
listed below. These defaults optimize performance and use of the
computer's cabinet space. Before moving the LANIC into another slot,
consult an HP representative.

HP3000 Systems                          Slot Number
920, 922, 925, 932                      4.3
935, or 949 with HPIB

920, 925, 935, or                       4.2
949 with ALINK

9x7                                     56

9x8                                     56/56

930                                     8.4

950, 955, 960, 980                      2/4.2

990/992, 991/995                        0/40
End verbatim.

OK, so my manual is outta date, but you get the picture. Hope this
helps.

Kindest Regards.