Ethernet RJ45 Color
Code with Pin out (T568A, T568B)
An Ethernet
cable consists of 8 wires (or 4 pairs of wires). These cables follow a specific
color code with respect to the arrangement of the wires. The connector of Ethernet
cable is available in two standards, i.e., T568A and T568B.
And based on
the combination of these two connectors (used at the ends of an Ethernet
cable), two widely used Ethernet cables are made, i.e., Straight and Crossover.
RJ45 color code and pin out of each configuration are given below.
An Ethernet
cable is available in many types. Straight-through, Crossover, Rolled, Loopback
and T1 are some of them. Among these straight-through and crossover are the
commonly used wiring standards. The other standards are reserved for specific
network applications.
These cables (connector)
follow two pin out standards: T568A and T568B. Both standards are similar in
their electrical properties. The selection of these standards purely depends on
the organization and the country. Both standards give the same performance.
RJ45
cable pin out with color code
The connector of Ethernet cable has two standards, i.e., T568A and T568B. Both these standards have the same number and color of wires. The only difference lies in the positions of green and orange wires. Let’s discuss T568A and T568B pin out standards in detail.
RJ45 (T-568A) Color Code And Pin Out
Pinout of T-568A Standard
T568A pin out standard
was commonly used in the ’90s. It’s still in use but T568B is more common now.
The key highlight of T568A wiring is that it is backward compatible with
one-pair as well as two-pair USOC (Universal Service Ordering Code) wiring
schemes.
The pin out description
with the color code of T568A is given in the table below.
Pinout and Color Code of T568A
RJ45 (T-568B) Color Code And Pin Out
T568B standard is a
widely used wiring standard in current Ethernet applications as it gives better
protection from noise. It also isolates the signal more effectively as compared
to T568A. It is backward compatible with only a one-pair USOC wiring scheme.
The pin out description with the color code of T568B is given
in the table below.
Types
of Ethernet Cable
As already
mentioned above, the connector comes in two standards, T568A and T568B. A cable
may have the same or different standard connector at its end. Based on this,
there are two types of cables, Straight
and Crossover.
Straight-Through
Cables
The straight-through cables use the same connector standard at both ends. This means that both ends either have T568A or T568B standard connectors. The figure below shows the two ends of a cable connected with the T568A standard.
The
straight-through cables are used to connect dissimilar devices. For example, a
hub connected to a laptop. Also, the connection of Data Terminating Equipment
(DTE) to Data Communications Equipment (DCE) is usually done using
straight-through cables.
Crossover Cables
When the ethernet wires are terminated with T568A standard
at one end and with T568B standard at the other end, they are called
crossover cables. It follows the reverse features of straight-through cables.
They are used to connect similar devices. Like a laptop to another laptop.
The figure above shows that the 4 pairs of wires are
cross-connected in this case. Whereas, in straight-through cables, the wires
are connected straight to the other end.
