Table Of Contents
Cables and Cabling
Serial Null Modem Cable
UTP-X Cables
Male Cable Connector
Pin Connections
Cables and Cabling
The following cabling diagrams describe the pin-to-pin connections of cables used by the Cisco Metro 1500 series system.
Serial Null Modem Cable
The null modem cable wiring diagram in Table A-1 provides signaling between machines that allows you to use hardware RTS/CTS flow control.
Table A-1 Wiring Diagram for Serial Null Modem Cable
Pin Signal
|
Pin ------------------------------------------ Pin
|
CD
|
1 ------------------------------------------- 4
|
Rx Data
|
2 ------------------------------------------- 3
|
Tx Data
|
3 ------------------------------------------- 2
|
DTR
|
4 ------------------------------------------- 1
|
Ground
|
5 ------------------------------------------- 5
|
DSR
|
6
|
RTS
|
7 ------------------------------------------- 8
|
CTS
|
8 ------------------------------------------- 7
|
RI
|
9 ------------------------------------------- 9
|
UTP-X Cables
The cables described in this section are used to interconnect systems either directly or through a network hub.
Male Cable Connector
To find pin 1 on a 10BaseT plug, follow these steps:
Step 1 
Hold the cable in your right hand with the connector up and the cable dangling down.
Step 2 Turn the connector around so that the flat side is toward you and the plastic tag is away from you.
Step 3 Pin one is to your left, as shown in Figure A-1.
Figure A-1 Male 10BaseT Plug
Pin Connections
There is no specified color coding for cables under 10BaseT. Color coding for wiring under the EIA/TIA-568B standard is given for use with striped twisted pair. Whether you are using striped twisted pair or solid color twisted pair, follow the appropriate wiring diagrams in Table A-2 and Table A-3.
Note It is important that wiring be done using twisted pairs. Pins 1 and 2 should be wired using one twisted pair and pins 3 and 6 should be wired using a second twisted pair.
Straight-through cables are used in a star-based setup to connect systems to a hub. Table A-2 contains the cabling diagram for a straight through cable.
Table A-2 Wiring Diagrams for 10BaseT Straight Cable
Pinout
|
Striped Color
|
Solid Color
|
Pin 1 (TD+) --------------------------- (TD+) Pin 1
|
White/Orange
|
Green
|
Pin 2 (TD-) ---------------------------- (TD-) Pin 2
|
Orange
|
Yellow
|
Pin 3 (RD+) --------------------------- (RD+) Pin 3
|
White/Green
|
Blue
|
Pin 4 --------(Not used by 10BaseT)------- Pin 4
|
Blue
|
Red
|
Pin 5 --------(Not used by 10BaseT)------- Pin 5
|
White/Blue
|
Black
|
Pin 6 (RD-) ---------------------------- (RD-) Pin 6
|
Green
|
Orange
|
Pin 7 --------(Not used by 10BaseT)------- Pin 7
|
White/Brown
|
Brown
|
Pin 8 --------(Not used by 10BaseT)------- Pin 8
|
Brown
|
Grey
|
Crossover or X cables are used to connect two systems directly together without using a hub. Crossover cables are also used to connect stacked 10BaseT hubs. Table A-3 contains the cabling diagram for a crossover cable.
Table A-3 Wiring Diagrams for 10BaseT Crossover Cable
Pinout
|
Striped Color
|
Solid Color
|
Pin 1 (TD+) --------------------------- (RD+) Pin 3
|
White/Orange
|
Green
|
Pin 2 (TD-) ---------------------------- (RD-) Pin 6
|
Orange
|
Yellow
|
Pin 3 (RD+) --------------------------- (TD+) Pin 1
|
White/Green
|
Blue
|
Pin 4 --------(Not used by 10BaseT)------- Pin 4
|
Blue
|
Red
|
Pin 5 --------(Not used by 10BaseT)------- Pin 5
|
White/Blue
|
Black
|
Pin 6 (RD-) ---------------------------- (TD-) Pin 2
|
Green
|
Orange
|
Pin 7 --------(Not used by 10BaseT)------- Pin 7
|
White/Brown
|
Brown
|
Pin 8 --------(Not used by 10BaseT)------- Pin 8
|
Brown
|
Grey
|
Table A-4 contains the cable specification for the twisted pair wore used in wiring the cables.
Table A-4 Cable Specification
Power
|
Cable Type
|
Category
|
100 ohm1
|
4-pair unshielded/shielded twisted-pair (UTP/STP)
|
3 to 5
|
150 ohm1
|
2-pair shielded twisted-pair (STP)
|
3 to 5
|
