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Table Of Contents

Cables and Cabling

Serial Null Modem Cable

UTP-X Cables

Male Cable Connector

Pin Connections


Cables and Cabling


This appendix lists the pin-to-pin connections for cables used by the Cisco Metro 1500 series system. This appendix includes the following sections:

Serial Null Modem Cable

UTP-X Cables

Serial Null Modem Cable

Table B-1 shows the null modem cable wiring. It shows the signaling between machines that allows you to use hardware RTS/CTS flow control.

Table B-1 Wiring 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 interconnect systems either directly or through a network hub.

Male Cable Connector

To find pin 1 on a 10BASE-T 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 1 is to the left, as shown in Figure B-1.


Figure B-1 Male 10BASE-T Plug

Table B-2 lists cable specifications for 10BASE-T connectors.

Pin Connections

There is no specified color coding for cables under 10BASE-T. 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 B-2 and Table B-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 B-2 contains the cabling diagram for a straight-through cable.

Table B-2 Wiring for 10BASE-T Straight-Through 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 10BASE-T)------- Pin 4

Blue

Red

Pin 5 --------(Not used by 10BASE-T)------- Pin 5

White/Blue

Black

Pin 6 (RD-) ---------------------------- (RD-) Pin 6

Green

Orange

Pin 7 --------(Not used by 10BASE-T)------- Pin 7

White/Brown

Brown

Pin 8 --------(Not used by 10BASE-T)------- Pin 8

Brown

Grey


Crossover or X cables connect two systems directly together without using a hub. Crossover cables also connect stacked 10BASE-T hubs. Table B-3 contains the cabling diagram for a crossover cable.

Table B-3 Wiring for 10BASE-T 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 10BASE-T)------- Pin 4

Blue

Red

Pin 5 --------(Not used by 10BASE-T)------- Pin 5

White/Blue

Black

Pin 6 (RD-) ---------------------------- (TD-) Pin 2

Green

Orange

Pin 7 --------(Not used by 10BASE-T)------- Pin 7

White/Brown

Brown

Pin 8 --------(Not used by 10BASE-T)------- Pin 8

Brown

Grey


Table B-4 contains the cable specification for the twisted pair wire used in wiring the cables.

Table B-4 Cable Specification

Power
Cable Type
Category

100 ohm1

4-pair unshielded/shielded twisted-pair (UTP/STP)2

3 to 5

150 ohm3

2-pair shielded twisted-pair (STP)

3 to 5

1 Maximum segment distance = 100 meters

2 UTP/STP = unshielded twisted pair/shielded twisted pair

3 Maximum segment distance = 100 meters



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Posted: Wed Apr 13 18:51:48 PDT 2005
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