Cabling Specifications

This appendix describes cables and cabling guidelines for the Cisco 815 integrated services router and contains the following sections:

•Ethernet Cables

•Ethernet Network Cabling Guidelines

•Console Cable and Adapter

Note For information about cables used with Cisco WAN interface cards (WICs), refer to the Cisco Interface Cards Hardware Installation Guide.

Ethernet Cables

This section describes the Ethernet cables that are used to connect the router to your local Ethernet network. A 10/100BASE-TX router, such as the Cisco 815 integrated services router, requires Category 5 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable. Table B-1 gives the pinouts for an Ethernet cable.

Table B-1 Ethernet Cable Pinouts 

RJ-45
Pin 1
Signal
Direction
RJ-45
Pin

1

TX+

—>

1

2

TX-

—>

2

3

RX+

<—

3

6

RX-

<—

6

1 Pins 4, 5, 7, and 8 are not used for signaling.


Ethernet Network Cabling Guidelines

Table B-2 describes some guidelines for creating Ethernet networks. Figures might vary, depending on the manufacturer of the network equipment.

Table B-2 Ethernet Cabling Guidelines 

Specification
10BASE-T
100BASE-TX

Maximum segment length

100 meters

100 meters

Maximum number of segments per network

5

•With Class I repeaters: 1

•With Class II repeaters: 2

Maximum hop count1

4

•With Class I repeaters: none

•With Class II repeaters: 1

Maximum number of nodes per segment

1024

1024

Cable type required

UTP Category 3, 4, or 5

UTP Category 5 or STP

1 Hop count = Routing metric used to measure the distance between a source and a destination.


Console Cable and Adapter

A console cable is provided with your router. Use this cable to connect the router to a PC or terminal. The router comes with a DB-9-to-DB-25 adapter that may be used for connecting the router to a modem, using the console cable.

Table B-3 describes the wiring for the console port and the console cable. This table also includes pinouts for the DB-9-to-DB-25 adapter.

Table B-3 Console Cable and Adapter Pinouts 

Console (DTE)
Console Port
Console Cable
Adapter
Terminal (DTE)
Signal
RJ-45 Pin
DB-9 Pin
DB-25 Pin
Signal

RTS

1

8

5

CTS

DTR

2

6

8

DSR

TXD

3

2

3

RXD

GND

4

5

7

GND

GND

5

5

7

GND

RXD

6

3

2

TXD

DSR

7

4

20

DTR

CTS

8

7

4

RTS