Appendix: Networking
connection
RJ45 pin assignments
1000Mbps, 1000BASE-T
Contact
MDI
MDI-X
1
BI_DA+
BI_DB+
2
BI_DA
-
B
I_DB
-
3
BI_DB+
BI_DA+
4
BI_DC+
BI_DD+
5
BI_DC
-
BI_DD
-
6
BI_DB
-
BI_DA
-
7
BI_DD+
BI_DC+
8
BI_DD
-
BI_DC
-
Implicit implementation of the crossover function within a
twisted
-pair cable
or at a wiring panel, while not expressly
forbidden, is beyond the scope of this standard.
10/100Mbps, 10/100BASE-TX
When connecting the gigabit Ethernet switch to another Fast
Ethernet switch, a straight
-
through or crossover cable might be
necessary. Each port of the gigabit Ethernet switch supports
auto
-
MDI/MDI
-X detectio
n, which enables direct connection to
any Ethernet device without making a crossover cable. The
following table and diagram show the standard RJ45
receptacle/connector and their pin assignments:
RJ45 connector pin assignment
Contact
MDI
Media Dependent
Interface
MDI-X
Media Dependent
Interface -Cross
1
Tx + (transmit)
Rx + (receive)
2
Tx
-
(transmit)
Rx
-
(receive)
3
Rx + (receive)
Tx + (transmit)
4, 5
Not used
6
Rx
-
(receive)
Tx
-
(transmit)
7, 8
Not used
The standard RJ45 receptacle/connector
There are eight
wires on a standard UTP/STP cable and each
wire is color
-coded.
Figure
12
below
shows the pin allocation
and color of straight
-
through ca
ble and crossover cable
connection.
Figure 12: Straight-through and crossover cable
Straight-through Cable
SIDE 1
SIDE 2
SIDE 1
1 = White / Orange
2 = Orange
3 = White / Green
4 = Blue
5 = White / Blue
6 = Green
7 = White / Brown
8 = Brown
1 = White / Orange
2 = Orange
3 = White / Green
4 = Blue
5 = White / Blue
6 = Green
7 = White / Brown
8 = Brown
SIDE 2
Crossover Cable
SIDE 1
SIDE 2
SIDE 1
1 = White / Orange
2 = Orange
3 = White / Green
4 = Blue
5 = White / Blue
6 = Green
7 = White / Brown
8 = Brow
n
1 = White / Green
2 = Green
3 = White / Orange
4 = Blue
5 = White / Blue
6 = Orange
7 = White / Brown
8 = Brown
SIDE 2
En
sure
that the connected cables have the same pin assignment and color as described above
before deploying them in a
network
.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
P/N 1073337-EN
• REV
A
• ISS
19JUL17
7 / 8
