cc/td/doc/product/lan/cat2950/12122ea2
hometocprevnextglossaryfeedbacksearchhelp
PDF

Table Of Contents

Connectors and Cables

Connector Specifications

10/100 and 10/100 /1000 Ports

100BASE-FX Ports

100BASE-LX Ports

Power and Relay Connector

Console Port

Cable and Adapter Specifications

Two Twisted-Pair Cable Pinouts

Four Twisted-Pair Cable Pinouts for 10/100 Ports

Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports

Cable and Adapter Pinouts


Connectors and Cables


This appendix describes the connectors, cables, and adapters that you use to connect the switch to other devices.

Connector Specifications

These sections describe the connectors used with the Catalyst 2955 switches and contain this information:

10/100 and 10/100 /1000 Ports

100BASE-FX Ports

100BASE-LX Ports

Power and Relay Connector

Console Port

10/100 and 10/100 /1000 Ports

The 10/100 and 10/100/1000 Ethernet ports on Catalyst 2955 switches use standard RJ-45 connectors and Ethernet pinouts with internal crossovers. Figure B-1 and Figure B-2 show the pinouts.

Figure B-1 10/100 Port Pinouts

Figure B-2 10/100/1000 Port Pinouts

100BASE-FX Ports

The 100BASE-FX multimode (MM) fiber-optic ports use MT-RJ connectors, shown in Figure B-3. These ports use 50/125- or 62.5/125-micron multimode fiber-optic cabling.

For MM connections, use one of the LCs listed in Table B-1. Use the Cisco part numbers in Table B-1 to order the patch cables that you need.

Figure B-3 MT-RJ Connector


Warning Class 1 LED product. Statement 1027


Table B-1 MT-RJ Patch Cables for 100BASE-FX Connections 

Type
Cisco Part Number

1-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-1M

3-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-3M

5-meter, MT-RJ-to-SC multimode cable

CAB-MTRJ-SC-MM-5M

1-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-1M

3-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-3M

5-meter, MT-RJ-to-ST multimode cable

CAB-MTRJ-ST-MM-5M


100BASE-LX Ports

The 100BASE-LX single-mode (SM) fiber-optic ports use LC-type connectors, shown in Figure B-4. These ports use 9/125-micron single-mode fiber-optic cabling.

Figure B-4 100BASE-LX SM Port Connector


Warning Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051



Warning Class 1 laser product. Statement 1008


For SM connections, use one of the LCs listed in Table B-2. Use the Cisco part numbers in Table B-2 to order the connectors that you need.

Table B-2 LC Patch Cables for 100BASE-LX Connections 

Type
Cisco Part Number

2-meter, LC-to-SC single-mode cable

CAB-CP-LCSC-2M

8-inch, SC-to-LC single-mode cable

CAB-CP-SCLC-8IN

10-foot, LC-to-SC single-mode cable

CAB-SMF-SC-10

100-foot, LC-to-SC single-mode cable

CAB-SMF-SC-100

25-foot, LC-to-SC single-mode cable

CAB-SMF-SC-25

50-foot, LC-to-SC single-mode cable

CAB-SMF-SC-50

75-foot, LC-to-SC single-mode cable

CAB-SMF-SC-75


Power and Relay Connector

The power and relay connector is a pluggable-screw terminal block connector that provides power and return connections for both the primary and secondary power supplies. The power and relay connector also gives the Catalyst 2955 switch the interfaces to two independent alarm relays.


Note You can get replacement power and relay connectors (PWR-2955-CONNECT=) by calling Cisco Technical Support. See the "Obtaining Technical Assistance" section on page xxviii.


Figure B-5 Power and Relay Connector

Console Port

The console port uses an 8-pin RJ-45 connector. You can connect a switch to a PC through the console port and the supplied RJ-45-to-DB-9 adapter cable. If you want to connect a switch to a terminal, you need to provide an RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco. For console-port and adapter-pinout information, see Table B-3 and Table B-4.

Cable and Adapter Specifications

These sections describe the cables and adapters used with Catalyst 2955 switches.

Two Twisted-Pair Cable Pinouts

Four Twisted-Pair Cable Pinouts for 10/100 Ports

Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports

Two Twisted-Pair Cable Pinouts

Figure B-6 and Figure B-7 show the schematics of two twisted-pair cables for 10/100 ports.

Figure B-6 Two Twisted-Pair Straight-Through Cable Schematic for 10/100 Ports

Figure B-7 Two Twisted-Pair Crossover Cable Schematic for 10/100 Ports

Four Twisted-Pair Cable Pinouts for 10/100 Ports

Figure B-8 and Figure B-9 show the schematics of four twisted-pair cables for 10/100 ports.

Figure B-8 Four Twisted-Pair Straight-Through Cable Schematic for 10/100 Ports

Figure B-9 Four Twisted-Pair Crossover Cable Schematic for 10/100 Ports

Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports

Figure B-10 and Figure B-11 show the schematics of four twisted-pair cables for 10/100/1000 ports on Catalyst 2955T-12 switches and 1000BASE-T ports.

Figure B-10 Four Twisted-Pair Straight-Through Cable Schematic for 10/100/1000 and 1000BASE-T Ports

Figure B-11 Four Twisted-Pair Crossover Cable Schematics for 10/100/1000 and 1000BASE-T Ports

Cable and Adapter Pinouts

This section describes the cable and adapter pinouts and also describes how to identify a rollover cable.

Connecting to a PC

Use the supplied RJ-45-to-DB-9 adapter cable to connect the console port to a PC running terminal-emulation software. Figure B-12 shows how to connect the console port to a PC. Table B-3 lists the pinouts for the console port and the RJ-45-to-DB-9 adapter cable.

Figure B-12 Connecting the Console Port to a PC

Table B-3 Console Port Signaling and RJ-45-to-DB-9 Adapter Cabling  

Console
Port (DTE)
RJ-45-to-DB-9
Adapter Cable
Console
Device
Signal
RJ-45 Pin
DB-9 Pin
Signal

RTS

1

8

CTS

Not connected

2

6

DSR

TxD

3

2

RxD

GND

4

5

GND

GND

5

5

GND

RxD

6

3

TxD

Not connected

7

4

DTR

CTS

8

7

RTS


Connecting to a Terminal

Use the supplied RJ-45-to-DB-9 adapter cable and an RJ-45-to-DB-25 female DTE adapter to connect the console port to a terminal. Figure B-13 shows how to connect the console port to a terminal. Table B-4 lists the pinouts for the console port, the adapter cable, and the RJ-45-to-DB-25 adapter.


Note The RJ-45-to-DB-25 female DTE adapter is not supplied with the switch. You can order a kit (part number ACS-DSBUASYN=) with that adapter from Cisco.


Figure B-13 Connecting the Console Port to a Terminal

Table B-4 Console Port Signaling and Cabling Using a DB-25 Adapter 

Console
Port (DTE)
RJ-45-to-DB-9
Adapter Cable
RJ-45-to-DB-25
Terminal Adapter
Console
Device
Signal
RJ-45 Pin
DB-9 Pin
DB-25 Pin
Signal

RTS

1

8

5

CTS

Not connected

2

6

6

DSR

TxD

3

2

3

RxD

GND

4

5

7

GND

GND

5

5

7

GND

RxD

6

3

2

TxD

Not connected

7

4

20

DTR

CTS

8

7

4

RTS


Identifying a Crossover Cable

To identify a crossover cable, compare 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-14.)

Figure B-14 Identifying a Crossover Cable


hometocprevnextglossaryfeedbacksearchhelp

Posted: Mon Nov 15 05:31:07 PST 2004
All contents are Copyright © 1992--2004 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.