2.1 Modem Functions
2.1.6 Difference between console and auxiliary ports

The console port does not entertain pin 1 (RTS) and pin 8 (CTS), as shown in the Console Port Table . Therefore, hardware flow control is nonexistent. By limiting the speed to 9600 baud, the risk of overflowing the buffer is quasi null. The auxiliary port uses pins 1 and 8, as shown in the Auxiliary Port Table , and, therefore, can accommodate a modem.

Web Links
Cable Specifications