Console And Auxiliary Port Considerations; Console Port Connections; Auxiliary Port Connections - Cisco Router 3600 Hardware Installation Manual

Chapter 2 Preparing to Install the Router

Console and Auxiliary Port Considerations

The router includes an asynchronous serial console port and an auxiliary port. The console and auxiliary
ports provide access to the router either locally using a console terminal, or remotely using a modem
connected to the auxiliary port. This section discusses important cabling information to consider before
connecting a console terminal, which can be either an ASCII terminal or a PC running terminal
emulation software, to the console port or modem to the auxiliary port.
The main difference between the console and auxiliary ports is that the auxiliary port supports hardware
flow control and the console port does not. Flow control paces the transmission of data between a
sending device and a receiving device. Flow control ensures that the receiving device can absorb the data
sent to it before the sending device sends more. When the buffers on the receiving device are full, a
message is sent to the sending device to suspend transmission until the data in the buffers has been
processed. Because the auxiliary port supports flow control, it is ideally suited for use with the
high-speed transmissions of a modem. Console terminals transmit at slower speeds than modems;
therefore, the console port is ideally suited for use with console terminals.

Console Port Connections

The router has an EIA/TIA-232 asynchronous serial console port (RJ-45). Depending on the cable and
the adapter used, this port appears as a DTE or DCE device at the end of the cable.
For connection to a PC running terminal emulation software, your router is provided with an RJ-45 to
DB-9 adapter cable.
To connect the router to an ASCII terminal, use an RJ-45 rollover cable and an RJ-45-to-DB-25 female
adapter (not provided).
The default parameters for the console port are 9600 baud, 8 data bits, no parity, and 2 stop bits. The
console port does not support hardware flow control. For detailed information about installing a console
terminal, refer to the
For cable and port pinouts, refer to the
online or on the Documentation CD-ROM.

Auxiliary Port Connections

The router has an EIA/TIA-232 asynchronous serial auxiliary port (RJ-45) that supports flow control.
Depending on the cable and the adapter used, this port appears as a DTE or DCE device at the end of the
cable.
For connection to a modem, your router is provided with an RJ-45-to-DB-25 adapter cable.
For detailed information about connecting devices to the auxiliary port, refer to the
Console Terminal or Modem" section on page
For cable and port pinouts, refer to the
online or on the Documentation CD-ROM.
OL-2056-05
"Connecting to a Console Terminal or Modem" section on page
Cisco Modular Access Router Cable Specifications
3-43.
Cisco Modular Access Router Cable Specifications
Cisco 3600 Series Routers Hardware Installation Guide

Console and Auxiliary Port Considerations

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