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This document describes how to use the default parameters to connect and configure management terminals.
There are no specific requirements for this document.
The information in this document is based on these software and hardware versions:
These switches require the use of either a rollover or straight-through RJ-45 cable to connect a terminal to the console port. The cable you use depends on the type of Supervisor Engine and other factors. Rollover cables and straight-through cables have pinouts that are different than crossover cables, which can connect 10/100BASE-TX Ethernet ports between switches. To identify the type of cable you use, refer to Configure Cable Requirements for Console and AUX Ports.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.
For more information on document conventions, refer to the Cisco Technical Tips Conventions.
This document focuses on use of the default parameters to connect and configure management terminals. This document covers the Catalyst 1900, 2820, 2900, 3500, 3560, 2948G-L3, 4500, 4840G, 4908G-L3, and 6500/6000 series switches.
Use the supplied rollover cable and the DB-9 adapter to connect a PC to the switch console port. You need to provide an RJ-45-to-DB-25 female DTE adapter if you want to connect the switch console port to a terminal. You can order a kit (part number ACS-DSBUASYN=) that contains the adapter from Cisco. The PC or terminal must support VT100 terminal emulation. The terminal emulation software—frequently a PC application such as Microsoft Windows HyperTerminal or Symantec Procomm Plus—makes possible the communication between the switch and your PC or terminal during the setup program.
To connect the PC or terminal to the switch:
Table A-1: Console Port Signaling and Cabling with a DB-9 Adapter
| Console Port (DTE) | RJ-45-to-RJ-45 Rollover Cable | RJ-45-to-DB-9 Terminal Adapter | Console Device | |
|---|---|---|---|---|
| Signal | RJ-45 Pin | RJ-45 Pin | DB-9 Pin | Signal |
| RTS 1 | 1 | 8 | 8 | CTS 2 |
| No connection | 2 | 7 | 6 | DSR |
| TxD 3 | 3 | 6 | 2 | RxD 4 |
| GND 5 | 4 | 5 | 5 | GND |
| GND | 5 | 4 | 5 | GND |
| RxD | 6 | 3 | 3 | TxD |
| No connection | 7 | 2 | 4 | DTR 6 |
| CTS | 8 | 1 | 7 | RTS |
1 RTS = Request To Send
2 CTS = Clear To Send
3 TxD = Transmit Data
4 RxD = Receive Data
6 DTR = Data Terminal Ready
Use the thin, flat RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 female DTE adapter to connect the console port to a terminal. Table A-2 lists the pinouts for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter.
Note: The RJ-45-to-DB-25 female DTE adapter does not come with the switch. You can order a kit (part number ACS-DSBUASYN=) that contains this adapter from Cisco.
Table A-2: Console Port Signaling and Cabling with a DB-25 Adapter
| Console Port (DTE) | RJ-45-to-RJ-45 Rollover Cable | RJ-45-to-DB-25 Terminal Adapter | Console Device | |
|---|---|---|---|---|
| Signal | RJ-45 Pin | RJ-45 Pin | DB-25 Pin | Signal |
| RTS | 1 | 8 | 5 | CTS |
| No connection | 2 | 7 | 6 | DSR |
| TxD | 3 | 6 | 3 | RxD |
| GND | 4 | 5 | 7 | GND |
| GND | 5 | 4 | 7 | GND |
| RxD | 6 | 3 | 2 | TxD |
| No connection | 7 | 2 | 20 | DTR |
| CTS | 8 | 1 | 4 | RTS |
You can configure the Catalyst switch routers from a direct console connection to the console port or remotely through the management port.
The console port is an RJ-45 receptacle. There is support for DTR and DSR handshake signals. The RTS signal tracks the state of the CTS signal.Table B-1 lists pinouts for the console port.
Table B-1: Console Port Pinouts
| Pin | Signal | Direction | Description |
|---|---|---|---|
| 1 1 | RTS/CTS | Output | Request To Send/Clear To Send |
| 2 | DTR | Output | Data Terminal Ready |
| 3 | TxD | Output | Transmit Data |
| 4 | SGND | — | Signal Ground |
| 5 | SGND | — | Signal Ground |
| 6 | RxD | Input | Receive Data |
| 7 | DSR | Input | Data Set Ready |
| 8 1 | RTS/CTS | Input | Request To Send/Clear To Send |
1 Pin 1 has a connection to pin 8.
On the Catalyst 2926 series switch, you find the console port on the Supervisor Engine front panel. The port has the label CONSOLE, as shown in this figure:
Figure: Console Port Connector (Catalyst 2926 Series Switch)
The Supervisor Engine console port is a DCE DB-25 receptacle that supports a DCE EIA/TIA-232 interface. EIA/TIA-232 supports unbalanced circuits at signal speeds of up to 64 kbps.
Before you connect 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 bits per second [bps]) of the switch console port. Set up the terminal in this way:
Use a straight-through cable to connect the switch to a 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 this next figure 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 that connects to this port must be capable of asynchronous transmission.
Both DSR and data carrier detect (DCD) are active when the system runs. The RTS signal tracks the state of the CTS input. The console port does not support modem control or hardware flow control. Table C-1 lists the console port pinouts:
Table C-1: Catalyst 2926 Series Console Port Pinouts
| Pin | Signal | Direction | Description |
|---|---|---|---|
| 1 | GND | Ground | |
| 2 | RxD | —> | Receive Data |
| 3 | TxD | Transmit Data | |
| 4 | CTS | Clear To Send | |
| 5 | RTS | —> | Return To Send |
| 7 | GND | Ground | |
| 8 | DTR | —> | Data Terminal Ready |
| 20 | DCD | Data Carrier Detect |
The next figure shows the console and auxiliary (AUX) ports, which you find on the front panel of the Catalyst 2926G series switch.
Note: There is currently no support for the AUX port.
Figure: Console and AUX Port Connectors
The console port, which is an EIA/TIA-232 async serial port with an RJ-45 connector, is a full-featured DTE connection with hardware flow control.
Connect the terminal with a thin, flat RJ-45-to-RJ-45 rollover cable and one of these adapters:
Note: The adapter you use depends on the terminal connector.
Table C-2: Catalyst 2926G Series Console Port Pinouts
| Console Port | Console Device |
|---|---|
| Pin (Signal) | Connect to |
| 1 is looped to pin 8 | — |
| 2 (DTR) | DSR |
| 3 (RxD) | TxD |
| 4 (GND) | GND |
| 5 (GND) | GND |
| 6 (TxD) | RxD |
| 7 (DSR) | DTR |
| 8 is looped to pin 1 | — |
Note: You find an RJ-45-to-RJ-45 rollover cable and the adapters in the console port accessories kit that shipped with your Catalyst 2926G series switch.
The console port, which appears in the figure that follows, is a DCE DB-25 receptacle that supports a DCE EIA/TIA-232 interface. EIA/TIA-232 supports unbalanced circuits at signal speeds of up to 64 kbps.
Figure: DCE DB-25 Connector
Use a null modem cable to connect the switch to a remote DCE device, such as a modem or a DSU. Use a straight-through cable to connect the switch to a DTE device, such as a terminal or a PC.
The console port of the Catalyst 4500/4000 Supervisor Engine I uses a DB-25 connector and supports DTR, DSR, CTS, and RTS handshake signals. Table G-1 lists the Catalyst 4500/4000 Supervisor Engine I console port pinouts.
Table G-1: Catalyst 4003 Console Port Pinouts
| Pin | Signal | Direction | Description |
|---|---|---|---|
| 1 | Ground | ||
| 2 | RxD | Input | Receive Data |
| 3 | TxD | Output | Transmit Data |
| 4 | CTS | Input | Clear To Send |
| 5 | RTS | Output | Request To Send |
| 7 | Ground | ||
| 8 | DTR | Output | Data Terminal Ready |
| 20 | DSR | Input | Data Set Ready |
You can configure the Catalyst 4500/4000 series switches from a direct console connection to the console port.
Table H-1 lists the switch console port pinouts. Use a straight-through cable to connect the switch to a DTE device, such as a terminal or a PC.
Table H-1: Catalyst 4500/4000 Supervisor Engine II and later, 2948G, 2980G, and 4912G Console Port Pinouts
| Pin | Signal | Direction | Description |
|---|---|---|---|
| 1 | RTS | Output | Request To Send |
| 2 | DTR | Output | Data Terminal Ready |
| 3 | TxD | Output | Transmit Data |
| 4 | Ground | ||
| 5 | Ground | ||
| 6 | RxD | Input | Receive Data |
| 7 | DSR | Input | Data Set Ready |
| 8 | CTS | Input | Clear To Send |
The Catalyst 6500/6000 series switches come with an accessory kit that contains the cable and adapters you need to connect a console (an ASCII terminal or a PC that runs terminal emulation software) or modem to the console port. The accessory kit includes these items:
These items are the same cable and adapters that ship with the Cisco 2500 series routers and other Cisco products.
The Supervisor Engine front-panel console port mode switch allows you to connect a terminal or modem to the console port in this way:
Note: Use a ball-point pen tip or other small, pointed object to access the console port mode switch. The switch ships in the in position.
This section provides the signaling and pinouts for the console port in mode 1. (The port mode switch is in the in position.)
Table I-1: Port Mode 1—Console Port Signaling and Pinouts (DB-9 Adapter)
| Console Port | RJ-45-to-RJ-45 Rollover Cable | RJ-45-to-DB-9 Terminal Adapter | Console Device | |
|---|---|---|---|---|
| Signal | RJ-45 Pin | RJ-45 Pin | DB-9 Pin | Signal |
| RTS | 1 1 | 8 | 8 | CTS |
| DTR | 2 | 7 | 6 | DSR |
| TxD | 3 | 6 | 2 | RxD |
| GND | 4 | 5 | 5 | GND |
| GND | 5 | 4 | 5 | GND |
| GND | 6 | 3 | 3 | TxD |
| DSR | 7 | 2 | 4 | DTR |
| CTS | 8 1 | 1 | 7 | RTS |
1 Pin 1 has an internal connection to pin 8.
Table I-2: Port Mode 1—Console Port Signaling and Pinouts (DB-25 Adapter)
| Console Port | RJ-45-to-RJ-45 Rollover Cable | RJ-45-to-DB-25 Terminal Adapter | Console Device | |
|---|---|---|---|---|
| Signal | RJ-45 Pin | RJ-45 Pin | DB-25 Pin | Signal |
| RTS | 1 1 | 8 | 5 | CTS |
| DTR | 2 | 7 | 6 | DSR |
| TxD | 3 | 6 | 3 | RxD |
| GND | 4 | 5 | 7 | GND |
| GND | 5 | 4 | 7 | GND |
| RxD | 6 | 3 | 2 | TxD |
| DSR | 7 | 2 | 20 | DTR |
| CTS | 8 1 | 1 | 4 | RTS |
1 Pin 1 has an internal connection to pin 8.
Table I-3: Port Mode 1—Console Port Signaling and Pinouts (Modem Adapter)
| Console Port | RJ-45-to-RJ-45 Rollover Cable | RJ-45-to-DB-25 Modem Adapter | Modem | |
|---|---|---|---|---|
| Signal | RJ-45 Pin | RJ-45 Pin | DB-25 Pin | Signal |
| RTS | 1 1 | 8 | 4 | RTS |
| DTR | 2 | 7 | 20 | DTR |
| TxD | 3 | 6 | 3 | TxD |
| GND | 4 | 5 | 7 | GND |
| GND | 5 | 4 | 7 | GND |
| RxD | 6 | 3 | 2 | RxD |
| DSR | 7 | 2 | 8 | DCD |
| CTS | 8 1 | 1 | 5 | CTS |
1 Pin 1 has an internal connection to pin 8.
This section provides the signaling and pinouts for the console port in mode 2. (The port mode switch is in the out position). SeeTable I-4 for the pinouts. Mode 2 gives you the option to use a standard RJ-45 straight-through cable to connect a terminal.
Table I-4: Console Port Pinouts (Port Mode Switch Out)
| Console Port | Console Device |
|---|---|
| Pin (Signal) | Input/Output |
| 1 (RTS) 1 | Output |
| 2 (DTR) | Output |
| 3 (RxD) | Input |
| 4 (GND) | GND |
| 5 (GND) | GND |
| 6 (TxD) | Output |
| 7 (DSR) | Input |
| 8 (CTS) 1 | Input |
1 Pin 1 has an internal connection to pin 8.
If you have trouble with connection to the device via the console connection, perform these tasks: