A P P E N D I X
A
Cables
This appendix lists cables that have been tested and verified for use with the Catalyst 3000.
It also includes minimum pin-out information, if you use a cable that is not listed, you must verify that the cables used in your installation are wired correctly.
Note
Incorrectly wired cabling is the most common cause of problems for LAN communications. Working with a qualified LAN cable installer is recommended.
The Stack Port cable is a proprietary cable. It is similar, but not equivalent to a SCSI cable.
It is available in one meter lengths only.
This appendix covers the following topics:
•
UTP -Unshielded Twisted-pair Cable and Connector Pin-outs and signal listing
— 10Base-T
— 100Base-TX Expansion Module
•
AUI-Attachment Unit Interface (AUI Cable) pin-outs and signal listing
•
Standard EIA(RS)-232 Cables
•
Console Connector and Cable Pin-outs and listing
Cables A-1
Twisted-pair Cable and Connector Pin-outs
Twisted-pair Cable and Connector Pin-outs
10Base-T
10Base-T ports 1 through 15 on the Catalyst 3000 are always MDI-X, and port 16 can be set to MDI-X or MDI. Cabling these ports to different types of equipment will require a straight-through or a crossover cable.
•
Straight-through cable: MDI-X port connected to MDI port, use a straight-through connecting cable.
•
Crossover cable: MDI-X port connected to another MDI-X port, or MDI port connected to another MDI port, use a crossover connecting cable. Connections requiring a crossover cable are discussed in the next section.
Straight-through Cable
A “straight-through” cable is used when connecting two ports that are not set to the same
MDI mode or not set to the same MDI-X mode. 10Base-T ports 1 through 15 on the
Catalyst 3000 are always MDI-X, and port 16 can be set to MDI-X. When connecting these
MDI-X ports to ports that are MDI, such as PCs or servers, use a straight-through cable. A straight-through cable has each internal twisted pair of wires connected to the same pin number at each end. The twisted-pair wires must be twisted throughout the entire length of the cable. The wiring sequence must conform to AT&T 258A (not USOC). Figure A-1 shows the wiring diagram for a straight-through cable, and Table A-1, “10Base-T Cable
Pin-Out” is a listing of the signals used on each pin.
A-2 Catalyst 3000 and Catalyst Stack User Guide
Twisted-pair Cable and Connector Pin-outs
Figure A-1 Straight-through Cable Pin-out
3
2
6
5
8
7
4
1
6
7
3
4
1
2
5
8
Pins 1 and 2 must be a twisted pair.
Pins 3 and 6 must be a twisted pair.
Pins 4, 5, 7, and 8 are not used in this application, although they may be wired in the cable.
The following table lists the pin numbers and their respective signal names for a 10Base-T straight-through cable.
Cables A-3
Twisted-pair Cable and Connector Pin-outs
Table A-1
Pin
3
6
1
2
10Base-T Cable Pin-out
Signal
TX+
TX-
RX+
RX-
Note
Pins 4, 5, 7, and 8 are not used.
Crossover Cable
For cabling between two switches, the transmit and receive pairs must be reversed. You can do this in one of two ways:
1
Use a straight cable with one switch port set to MDI and the other set to MDI-X.
2
Use a crossover cable with both switch ports set to MDI or both ports set to MDI-X.
Figure A-2 shows the wiring diagram for a crossover cable.
A-4 Catalyst 3000 and Catalyst Stack User Guide
Figure A-2 Crossover Cable Pin-out
Twisted-pair Cable and Connector Pin-outs
A B
3
2
6
5
8
7
4
1
6
7
3
4
1
2
5
8
Pins 1 and 2 at B, must be a twisted pair wired through to pins 6 and 3, respectively, at A.
Pins 3 and 6 at A, must be a twisted pair wired through to pins 2 and 1, respectively, at B.
Pins 4, 5, 7, and 8 on cable B are not used in this application, although they may be wired in the cable.
A short crossover cable can be used to adapt a straight-through twisted-pair cable for
“cascading” switches through the twisted-pair ports.
Cables A-5
Twisted-pair Cable and Connector Pin-outs
100Base-TX Expansion Module
The 100Base-TX expansion module network port is always MDI-X. Cabling to different types of equipment will require a straight-through or a crossover cable.
•
Straight-through cable: If the other unit is MDI, such as a server, use a straight-through connecting cable.
•
Crossover cable: If the module is cabled to a unit that is also MDI-X, such as another
Catalyst 3000, use a crossover connecting cable.
Note
The 100Base-TX cable pin-out is the same as the 10Base-T cable pin-out. Use the
10Base-T cable information in the previous section for referencing 100Base-TX cables, whether straight or crossover.
Note
The only difference between 10Base-T and 100Base-TX cables, is that 10Base-T is a Category 3 cable, and 100Base-TX is a Category 5 cable. (Category 5 cable is usually a little heavier or stiffer than category 3 cable. Also check if the type of cable is imprinted on the cable jacket.)
A-6 Catalyst 3000 and Catalyst Stack User Guide
AUI Cable
AUI Cable
Table A-2 AUI Cable Pin-outs
10
12
13
6
9
4
5
2
3
Transceiver end
15-pin Female
10
12
13
6
9
4
5
2
3
Switch end
15-pin Male Signal
Control In circuit A
Data Out circuit A
Data In circuit Shield (common drain)
Data In circuit A
Voltage common
Control In circuit B
Data Out circuit B
Data In circuit B
Voltage plus (+12 @ 500ma)
For this connection, you can use:
• meter thin AUI extension, pin 4 not connected
•
48 meter thick AUI cables
• meter thin AUI cable, pin 4 not connected
Some longer cables may have all 15 pins wired. See the IEEE 802.3 standards document for definitions of the pins not shown here.
Cables A-7
Standard EIA(RS)-232 Cables
Standard EIA(RS)-232 Cables
Table A-3 EIA-232 Cable Description
Cable Function
Port Type on
Terminal, PC, or
Modem Standard Cable or Cable Solution
Connecting a terminal or
PC to the console port with an EIA(RS)-232-C
25-pin female
9-pin male
Attach a null modem adapter‡ (Tandy Null Modem Adapter No.
26-1496 has been tested) to the console port. Then attach a straight-through modem cable to the null modem adapter.
Use a Black Box PC/AT Serial Printer Cable (EVENBPC has been tested). OR:
Attach a null modem adapter to the console port. Then attach a modem cable (EVENBMC and Cablex PC have been tested) to the null modem adapter.
Connecting a modem to the console port
25-pin female or male port
Straight-through EIA-232-C modem cable (standard cable)
* For these cables, the signals DTR (pin 20) and RTS (pin 4) must be on, or high, on your terminal or in your terminal emulation program.
‡ The required minimum pin-out is provided in the section “Console Connector and Cable Pin-Outs.”
A-8 Catalyst 3000 and Catalyst Stack User Guide
Console Connector and Cable Pin-outs
Console Connector and Cable Pin-outs
The Catalyst 3000 has a DB-9 console port that automatically detects baud rate. The default is 9600 baud; other supported baud rates are 1200, 2400, 4800, and 19200.
Terminal
For a terminal connection, you use a null-modem cable or a straight cable with a null modem adapter attached.
Modem
For a modem connection, you can use a standard modem (straight) cable.
Console Pin Assignments
The following table and two figures detail pin assignment information for the cables you can use on the console port of the Catalyst 3000.
Table A-4
6
7
4
5
8
9
2
3
Pin
1
Pin-out for the Console Port Connector
Function
DCD
RXD
TXD
DTR
SIG GND
DSR
RTS
CTS
RI
Cables A-9
Console Connector and Cable Pin-outs
The following figures, (Figure A-3 and Figure A-4) detail pin assignment information for the cables you can use on the console port of the Catalyst 3000.
Figure A-3
DCD 1
RXD 2
TXD 3
DTR 4
SIG GND 5
DSR 6
RTS 7
CTS 8
RI 9
RS-232-C Null Modem Cable (for Terminal/PC with 25-pin Connector)
DB-9F
Catalyst 3000
DB-25
Terminal or PC
5 CTS
4 RTS
2 TXD
3 RXD
6 DSR
7 SIG GND
20 DTR
8 DCD
9 RI
Figure A-4
DCD 1
RXD 2
TXD 3
DTR 4
SIG GND 5
DSR 6
RTS 7
CTS 8
RI 9
RS-232-C Null Modem Cable (for Terminal/PC with 9-pin Connector)
DB-9F
Catalyst 3000
DB-9
Terminal or PC
8 CTS
7 RTS
3 TXD
2 RXD
6 DSR
5 SIG GND
4 DTR
1 DCD
9 RI
A-10 Catalyst 3000 and Catalyst Stack User Guide
