Table Of Contents
Connector and Cable Specifications
Connecting to 10BASE-T- and 100BASE-TX-Compatible Devices
Connecting to 1000BASE-T Devices
Cable and Adapter Specifications
Two Twisted-Pair Cable Pinouts
Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports
Crossover Cable and Adapter Pinouts
Connector and Cable Specifications
This appendix describes the switch module ports and the cables and adapters that you use to connect the switch to other devices.
Connector Specifications
These sections describe the connectors used with the switch module.
10/100/1000 Ports
The 10/100/1000 Ethernet ports on the switch use standard RJ-45 connectors. Figure B-1 shows the pinout.
Note
You can use the mdix auto interface configuration command in the CLI to enable the automatic medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is enabled, the switch detects the required cable type for copper Ethernet connections and configures the interfaces accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a copper 10/100/1000 or 1000BASE-T SFP module port on the switch, regardless of the type of device on the other end of the connection.
The auto-MDIX feature is enabled by default on switches running Cisco IOS Release 12.2(18)SE or later. For releases between Cisco IOS Release 12.1(14)EA1 and 12.2(18)SE, the auto-MDIX feature is disabled by default. For configuration information for this feature, refer to 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-4 shows the two twisted-pair, straight-through cable schematics. Figure B-6 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-5 shows the two twisted-pair, crossover cable schematics. Figure B-7 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-6 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, crossover cable. Figure B-7 shows the crossover cable schematics.
Note
Note
Figure B-1 10/100/1000 Port Pinouts
SFP Module Ports
The switch uses SFP modules for fiber-optic and copper uplink ports. Refer to the release notes for a list of supported SFP modules.
Figure B-2 Fiber-Optic SFP Module LC Connector
Warning
Figure B-3 Copper SFP Module RJ-45 Connector
Console Port
The console port uses an 8-pin RJ-45 connector, which is described in Table B-1 and Table B-2. 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-1 and Table B-2.
Cable and Adapter Specifications
These sections describe the cables and adapters used with the switch.
Two Twisted-Pair Cable Pinouts
Figure B-4 and Figure B-5 show the schematics of two twisted-pair cables for connecting to 10BASE-T- and 100BASE-TX-compatible devices.
Figure B-4 Two Twisted-Pair Straight-Through Cable Schematic
Figure B-5 Two Twisted-Pair Crossover Cable Schematic
Four Twisted-Pair Cable Pinouts for 1000BASE-T Ports
Figure B-6 and Figure B-7 show the schematics of four twisted-pair cables for 10/100/1000 ports on the switch.
Figure B-6 Four Twisted-Pair Straight-Through Cable Schematic for 10/100/1000 Ports
Figure B-7 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
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-8.)
Figure B-8 Identifying a Crossover Cable
Adapter Pinouts
Table B-1 lists the pinouts for the console port, the RJ-45-to-DB-9 adapter cable, and the console device.
Table B-2 lists the pinouts for the console port, RJ-45-to-DB-25 female DTE adapter, and the console device.
Note
