Catalyst 2960 Switch Hardware Installation Guide

10/100/1000 Ports

The 10/100/1000 Ethernet ports on the Catalyst 2960 switch use standard RJ-45 connectors. Figure B-1 shows the pinout.

Note The auto-MDIX feature is enabled by default. For configuration information for this feature, see the switch software configuration guide or the switch command reference.

Connecting to 10BASE-T- and 100BASE-TX-Compatible Devices

When connecting the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as servers, workstations, and routers, you can use a two or four twisted-pair, straight-through cable wired for 10BASE-T and 100BASE-TX. Figure B-5 shows the two twisted-pair, straight-through cable schematics. Figure B-7 shows the four twisted-pair, straight-through cable schematics.

When connecting the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-6 shows the two twisted-pair, crossover cable schematics. Figure B-8 shows the four twisted-pair, crossover cable schematics.

You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T-compatible devices. You must use Category 5 cabling when connecting to 100BASE-TX-compatible devices.

Connecting to 1000BASE-T Devices

When connecting the ports to 1000BASE-T devices, such as servers, workstations, and routers, you must use a four twisted-pair, Category 5, straight-through cable wired for 10BASE-T, 100BASE-TX, and 1000BASE-T. Figure B-7 shows the straight-through cable schematics.

When connecting the ports to other devices, such as switches or repeaters, you must use a four twisted-pair, Category 5 or higher crossover cable. Figure B-8 shows the crossover cable schematics.

Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a 1000BASE-T-compatible device.

Note Use a straight-through cable to connect two ports only when one port is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X or when both ports do not have an X.

Figure B-1 10/100/1000 Port Pinouts

SFP Module Ports

The Catalyst 2960 switch uses SFP modules for fiber-optic and copper uplink ports. See the Catalyst 2960 switch release notes for a list of supported SFP modules.

Figure B-2 Fiber-Optic SFP Module LC Connector

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

Figure B-3 Copper SFP Module RJ-45 Connector

Dual-Purpose Ports

The Ethernet port on a dual-purpose port uses standard RJ-45 connectors. Figure B-4 shows the pinouts.

The SFP module slot on a dual-purpose port uses SFP modules for fiber-optic and copper uplink ports. See the Catalyst 2960 switch release notes for a list of supported SFP modules.

Note The auto-MDIX feature is enabled by default. For configuration information for this feature, see the switch software configuration guide or the switch command reference.

Figure B-4 10/100/1000 Port Pinouts

Console Port

The console port uses an 8-pin RJ-45 connector, which is described in Table B-2 and Table B-3 . The supplied RJ-45-to-DB-9 adapter cable is used to connect the console port of the switch to a console PC. You need to provide a 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=) containing that adapter from Cisco. For console port and adapter pinout information, see Table B-2 and Table B-3 .

SFP Module Cable Specifications

Table B-1 lists the cable specifications for the fiber-optic SFP module connections. Each port must match the wave-length specifications on the other end of the cable, and for reliable communications, the cable must not exceed the required cable length. Copper 1000BASE-T SFP transceivers use standard four twisted-pair, Category 5 or greater cable at lengths up to 328 feet (100 meters).

Two Twisted-Pair Cable Pinouts

Figure B-5 and Figure B-6 show the schematics of two twisted-pair cables for connecting to 10BASE-T- and 100BASE-TX-compatible devices.

Figure B-5 Two Twisted-Pair Straight-Through Cable Schematic

Figure B-6 Two Twisted-Pair Crossover Cable Schematic

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

Figure B-7 and Figure B-8 show the schematics of four twisted-pair cables for 10/100/1000 ports on Catalyst 2960 switches.

Figure B-7 Four Twisted-Pair Straight-Through Cable Schematic for 10/100/1000 Ports

Figure B-8 Four Twisted-Pair Crossover Cable Schematics for 10/100/1000 Ports

Crossover Cable and Adapter Pinouts

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

Identifying a Crossover Cable

You can identify a crossover cable by comparing the two modular ends of the cable. Hold the cables side-by-side with the tab at the back. The first (far left) colored wire (pin 1) at one end of the cable is the third colored wire (pin 3) at the other end of the cable. The second colored wire (pin 2) at one end of the cable is the sixth colored wire (pin 6) at the other end of the cable. See Figure B-9.

Figure B-9 Crossover Cable

Figure B-10 RJ-45 Crossover Cable Identification

Adapter Pinouts

Table B-2 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.

Table B-3 lists the pinouts for the console port, RJ-45-to-DB-25 female DTE adapter, and the console device.

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=) containing this adapter from Cisco.