3com 3013 (3C13613) User Manual

LAN Switch. Straight-through network cables are delivered along with the 
router.

■

Crossover network cable — The sequences of the wires crimped at the RJ-45 
connectors of the two ends are different. The cable is used in the connection 
between the terminal device, such as a PC or a router, and another terminal 
device. You can create this cable yourself, if necessary.

Table 27 describes straight-through network cable pinouts.

Table 28 describes crossover network cable pinouts.

You can use Table 28 as a reference while distinguishing or preparing the two 
kinds of Ethernet cables. While preparing the Ethernet cables, follow the 
chromatogram given in this table to arrange the wires. Otherwise, communication 
quality will be affected even though the equipment at two ends is connected.

The synchronous/asynchronous serial port cable is connected to a DB-50 
receptacle. You must select the appropriate cable for the protocol. 

Table 27   Straight-through Network Cable Pinouts 

1

TX+

White (Orange)

—>

1

2

TX-

Orange

—>

2

3

RX+

White (Green)

<—

3

4

-

Blue

-

4

5

-

White (Blue)

-

5

6

RX-

Green

<—

6

7

-

White (Brown)

-

7

8

-

Brown

-

8

Table 28   Crossover Network Cable Pinouts 

1

TX+

White (Orange)

—>

3

2

TX-

Orange

—>

6

3

RX+

White (Green)

<—

1

4

-

Blue

-

4

5

-

White (Blue)

-

5

6

RX-

Green

<—

2

7

-

White (Brown)

-

7

8

-

Brown

-

8