HP PCI Multiplexer Family Cabling, Diagnostics, and Troubleshooting Manual

Port Naming and Numbering
HP-UX Port Names
Chapter 562
HP-UX Port Names
The following devices can be created:
Direct connect device.
Used for terminals, printers and other devices which do not support or
require modem control signals.
Modem control device.
Used for modems or other devices which use DTR/DCD (Data Terminal
Ready/Data Carrier Detect) modem control signals for establishing
connections.
Mux port names are of the general form
/dev/<port_type><instance><port module><port>
where:
<port_type> categories are:
tty = direct connect
ttyd = modem dial-in
cul = modem dial-out
cua = modem dial-out with automatic caller
NOTE The latter three examples are used with uucp dial-up protocol.
<instance> is an instance number which is assigned by HP-UX to the
mux card.
<port module> is a single lowercase letter from ‘a’ through ‘d’,
representing the first port module through the fourth port module.
<port> is a decimal number from 1 to 16.
Therefore, when direct connect port types are used, the first port on the
first port module (or fan out cable) of the first mux card is /dev/tty1a1.
The second port on the first port module (or fan out cable) of the first