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Table of Contents

Connectors and Cables

Connectors and Cables

This appendix provides connector and cable descriptions for the following switch 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). Table B-1 describes the port pin assignments.


Figure B-1: 10BaseT RJ-45 Connector


Table B-1: 10BaseT RJ-45 Port
Pin Assignments
Pin Label

1

RD+

2

RD-

3

TD+

4

NC

5

NC

6

TD-

7

NC

8

NC

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 Always observe the following general rules when connecting devices: Use a straight-through cable to connect two ports when one of the ports is designated with an X; use a crossover cable to connect two ports when both ports are designated with an X.

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 Figure B-4. The pin assignments for this port are described in Table B-2.


Figure B-4: Ethernet AUI Port


Table B-2: Ethernet AUI Port Pin Assignments
Pin Label Description

1

GND

Ground

2

CI+

Positive AUI differential collision-data input

3

TX+

Positive AUI differential transmit-data input

4

GND

Ground

5

RX+

Positive AUI differential receive-data output

6

GND

Ground

7

NC

---

8

GND

Ground

9

CI-

Negative AUI differential collision data

10

TX-

Negative AUI differential transmit-data input

11

GND

Ground

12

RX-

Negative AUI differential receive data output

13

+12V

12V supply for external MAU

14

GND

Ground

15

NC

---

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).


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. Figure B-6 shows how to connect the console port to a PC. Table B-3 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
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

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

1Pin 1 is connected (inside the terminal adapter) to Pin 8.

Connecting to a Terminal

Table B-4 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 This adapter is not supplied with the switch.


Table B-4: Console Port Signaling and Cabling Using 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

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

1Pin 1 is connected (inside the terminal adapter) to Pin 8.

Connecting to a Modem

Table B-5 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 This adapter is not supplied with the switch.


Table B-5: Console Port Signaling and Cabling Using a DB-25 Adapter
Console Port (DTE) 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

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

1Pin 1 is connected (inside the terminal adapter) to Pin 8.

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Posted: Thu Oct 28 20:05:13 PDT 1999
Copyright 1989-1999©Cisco Systems Inc.