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Cisco - Connecting a Terminal to the Console Port on Catalyst Switches

The Supervisor Engine console port is a data communications equipment (DCE) DB-25 receptacle that

supports a DCE EIA/TIA-232 interface. EIA/TIA-232 supports unbalanced circuits at signal speeds up to

64 kbps.

Before connecting the console port, check the terminal documentation to determine the baud rate. The

baud rate of the terminal must match the default baud rate (9600 bps) of the switch console port. Set up

the terminal as follows:

9600 BPS

8 data bits

No parity

1 stop bit

Use a straight-through cable to connect the switch to a data terminal equipment (DTE) device, such as a

terminal or a PC. Use a null-modem cable to connect the switch to a remote DCE device, such as a

modem or a Data Service Unit (DSU). See the figure below for DCE and DTE cable connectors.

Figure: EIA/TIA-232 Adapter Cable Connectors, Network End

Note: The console port is an asynchronous (Async) serial port; any device connected to this port must be

capable of asynchronous transmission.

Both Data Set Ready (DSR) and Data Carrier Detect (DCD) are active when the system is running. The

Request To Send (RTS) signal tracks the state of the Clear To Send (CTS) input. The console port does

not support modem control or hardware flow control.

Table C-1: Catalyst 2926 Series Console Port Pinouts

Signal

Direction

GND

RxD

TxD

CTS

RTS

http://www.cisco.com/warp/public/473/9.html (6 of 19) [9/4/2003 12:36:02 PM]

Description

Ground

Receive Data

Transmit Data

Clear To Send

Return To Send

Table C-1

lists the console port pinouts.