Between RJ45, RJ46 and RJ48
Connector users can easily identify between an RJ11 and
an RJ45 wiring, and point out the differences and specific
uses of each. But when it comes to an RJ45, RJ46 and an
RJ48, it becomes a little bit more difficult. This is because
they usually use the same modular connector and the differences
between the these connectors are not easily identifiable.
RJ which stands for registered jack does not actually identify
the type of connector that is being used. Instead, it identifies
the wiring that is being used. These two RJ types therefore
differ only in how they are wired.
RJ48, RJ45 and RJ45 connectors use the 8P8C modular plug
and 2 pairs of the wires, one pair for transmitting and
one pair for receiving data. The RJ45 that we are already
very familiar with uses the pins 1,2,3, and 6 for receiving
and transmitting data. With RJ46 connector uses all eight.
A "voice only" RJ11 connector only makes connections
to 3, 4, 5, 6 and the analog phone actually only uses 4,
5. With RJ48, there are a few configurations that can be
used depending on the situation and how they are to be used.
One configuration uses the pins 1,2,4, and 5 while another
uses 1,2,7, and 8. Other wires are also used for extra shielding
while the remaining wires are reserved in case some uses
would arise in the future.
RJ45 is used mainly in local area networks where the distances
between each network element is relatively short. This is
very common in a lot of offices and homes and is the main
reason why it has become very popular. RJ46 are used in
data and voice applications. RJ48 is used in other applications,
the most common one would be in T1 data lines where the
wires can extend longer distances and are often exposed
to the environment. To protect the integrity of the signal,
RJ48 wirings use STP or Shielded Twisted Pair cables. RJ45s
use the more common UTP or Unshielded Twisted Pair that
have categories 1 to 6, with cat5e being the most predominantly
Whether RJ45, RJ46 or RJ48 is to be used is dictated by
the hardware. It is no longer up to the consumer to choose.
Just make sure that you wire your connectors properly to
what the hardware needs so that you have a working link.