Appendix C Cable Specifications

Fast Ethernet Port Cables and Pinouts

Auxiliary Port Cables and Pinouts

Use the RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 male DCE adapter (labeled MODEM) to connect the auxiliary port to a modem. Table C-2lists the signals and pinouts for the asynchronous serial auxiliary port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter (labeled MODEM).

Table C-2 Auxiliary Port Signaling and Cabling Using a DB-25 Adapter

 

 

 

RJ-45-to-DB-25

 

AUX Port (DTE)

RJ-45-to-RJ-45 Rollover Cable

Modem Adapter

Modem (DCE)

 

 

 

 

 

Signal

RJ-45 Pin

RJ-45 Pin

DB-25 Pin

Signal

 

 

 

 

 

RTS

1

8

4

RTS

 

 

 

 

 

DTR

2

7

20

DTR

 

 

 

 

 

TxD

3

6

3

TxD

 

 

 

 

 

GND

4

5

7

GND

 

 

 

 

 

GND

5

4

7

GND

 

 

 

 

 

RxD

6

3

2

RxD

 

 

 

 

 

DSR

7

2

8

DCD

 

 

 

 

 

CTS

8

1

5

CTS

 

 

 

 

 

Fast Ethernet Port Cables and Pinouts

The 10BASE-T/100BASE-TX Fast Ethernet ports support IEEE 802.3 and IEEE 802.3u specifications for 10-Mbps and 100-Mbps transmission over unshielded twisted-pair (UTP) cables. Each Fast Ethernet port on the router has an RJ-45 connector to attach to Category 3 or Category 5 UTP cables.

Use a Category 3 UTP crossover cable when connecting 10BASE-T port to a hub.

Use a Category 3 UTP straight-through cable when connecting to a PC or other Ethernet device.

Use a Category 5 UTP crossover cable when connecting 100BASE-TX to a hub.

Use a Category 5 UTP straight-through cable when connecting to a PC or other Ethernet device.

Note Cisco Systems does not supply Category 3 or Category 5 UTP RJ-45 cables; these cables are available commercially.

Identifying an RJ-45 Crossover Cable

You can identify a crossover cable by comparing the two modular ends of the cable. Hold the cables side-by-side with the tab at the back. The first (far left) colored wire (pin 1) at one end of the cable is the third colored wire (pin 3) at the other end of the cable. The second colored wire (pin 2) at one end of the cable is the sixth colored wire (pin 6) at the other end of the cable. Pin 1 wire is white.

Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide

 

C-4

OL-5916-01

 

 

 

Page 110
Image 110
Cisco Systems UBR7100E manual Fast Ethernet Port Cables and Pinouts, Auxiliary Port Cables and Pinouts