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RS-232 Auxiliary Port
The 9-pin RS-232 Auxiliary serial port (the bottommost RS-232 port on the front panel)
is also a DTE male connector (DB-9).
The RS-232 Auxiliary port is reserved for 3Com service engineers. No device
should be connected to it during normal hub operation.
Table 2-3. RS-232 Auxiliary Port Pin Assignments
Pin Number Signal Name
1 No connection
2 Receive Data (RX)
3 Transmit Data (TX)
4 No connection
5 Signal Ground (GND)
6 No connection
7 Request to Send (RTS)
8 Clear to Send (CTS)
9 No connection
2-14 ONcore ATM Switch/Control Module: Installation and User's Guide