Table Of Contents
Connectors and Cables
This appendix provides connector and cable descriptions for the following switch ports:
•
Switched 10BaseT RJ-45 ports
•
•
For information on the Catalyst 2820 switch module ports and the cable types they use, refer to the Catalyst 2820 Modules User Guide and the Catalyst 2820 ATM Modules Installation and Configuration Guide.
Switched 10BaseT RJ-45 Ports
The 10BaseT ports (1x through 24x) use RJ-45 connectors (Figure B-1). describes the port pin assignments.
Figure B-1 10BaseT RJ-45 Connector
As indicated by the X, the 10BaseT ports have their transmit (TD) and receive (RD) signals internally crossed for attachment of an adapter using a straight-through cable.
When connecting the 10BaseT ports to 10BaseT-compatible servers, routers, or workstations, use a straight-through cable wired for 10BaseT. When connecting to other switches or repeaters, use a crossover cable.
Note
The schematics for the crossover and straight-through cables are shown in Figure B-2 and Figure B-3, respectively.
Figure B-2 Crossover Cable Schematic
Figure B-3 Straight-Through Cable Schematic
Switched 10-Mbps AUI Port
The Ethernet AUI port uses a 15-pin female connector, as shown in . The pin assignments for this port are described in .
Figure B-4 Ethernet AUI Port
Console Port
The console port uses an 8-pin RJ-45 connector, as shown in Figure B-1. The supplied RJ-45-to-RJ-45 rollover cable and adapters are used to connect the switch console port to a management station or modem. The following sections describe the rollover cable and adapters for the console port.
Identifying a Rollover Cable
You can identify a rollover cable by comparing the two modular ends of the cable. Hold the cable ends side-by-side, with the tab at the back. The wire connected to the pin on the outside of the left plug should be the same color as the wire connected to the pin on the outside of the right plug (see ).
Figure B-5 Identifying a Rollover Cable
Connecting to a PC
Use the thin, flat, RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL) to connect the console port to a PC running terminal emulation software. shows how to connect the console port to a PC. lists the pin assignments for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-9 female DTE adapter (labeled TERMINAL). This adapter is supplied with the switch.
Figure B-6 Connecting the Console Port to a PC
Table B-3 Console Port Signaling and Cabling Using a DB-9 Adapter
RTS
11
8
8
CTS
DTR
2
7
6
DSR
TxD
3
6
2
RxD
GND
4
5
5
GND
GND
5
4
5
GND
RxD
6
3
3
TxD
DSR
7
2
4
DTR
CTS
81
1
7
RTS
1 Pin 1 is connected (inside the terminal adapter) to Pin 8.
Connecting to a Terminal
lists the pin assignments for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 female DTE adapter.
Note
Table B-4 Console Port Signaling and Cabling Using a DB-25 Adapter
RTS
11
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
81
1
4
RTS
1 Pin 1 is connected (inside the terminal adapter) to Pin 8.
Connecting to a Modem
lists the pin assignments for the console port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter.
Note
Table B-5 Console Port Signaling and Cabling Using a DB-25 Adapter
RTS
11
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
81
1
5
CTS
1 Pin 1 is connected (inside the terminal adapter) to Pin 8.
