Introduction to RJ48 Cables

Hello, everyone!

Today, I would like to share with you, Introduction to RJ48 Cables.

RJ Cable
RJ abbreviated for the Registered Jack. It used as a medium in telecommunications or network interface. It enables network devices to connect voice and data equipment. It is mainly used to connect different types of data equipment and telecommunication media to take services offered by the local services provider to exchange data for longer distances and shorter exchange carriers. These RJ cables are categorised on the basis of structure and functions, such as size, PIN number, and their reliability on different devices.

Characteristics of the RJ Cable
It can work with configuring mounting surfaces for connecting voice and data equipment.
It is used with different telephone lines to share data over the registered jack connector.
There are many institutional academies, large organization, offices use RJ11, RJ12, RJ25, etc., because it can connect multiple telephone lines simultaneously.
It is also used to connect multiple computers using the Ethernet cable to share data over the local area network.
It can connect to cross-connections for more than two systems.

Advantages of the RJ Cable
It is easy to install and configured with different devices.
It is a reliable cable, and the connection speed with the telecommunication interface is high.

Disadvantage of the RJ Cable
It is only used for the shortest distance to connect with telecommunication devices.
Today most devices are wireless, so the use of registered jacks is becoming obsolete.
It has the limited mobility of the wire.

Types of RJ
There are following types of RJ cable used in telephone line and to connect and share data among the connected systems.

RJ11
RJ11-W
RJ14
RJ21RJ25
RJ45
RJ48
RJ61

Connector Specifications and Key Features
Modular connectors can be specified with additional features including:

• Shielding, to protect long cables against electromagnetic interference (EMI) or radio frequency interference (RFI). Shielded RJ45 and RJ48 connectors, which extend the ground connection of the cable shield braid into the panel in which they are mounted, are widely available.
• Certified keyed RJ45 connectors use a tab on the connector to prevent the connectors from being inserted into a jack the wrong way round. This feature is not normally present on a standard 8P8C connector. Color coding can be used to indicate which cables should be allowed to use particular network connection points.
• Mounting options, such as panel mount, board mount, through-hole mount, and surface mount on PCBs, are commonly available. Modular jacks are offered in vertical or horizontal orientation.
• Display and indication functions, such as status color LEDs.
• High-reliability variants may include EMI/RFI shielding, special keying, protective sheaths, and rugged parts allowing for more insertion/removal cycles.
• Built-in magnetics to improve EMI shielding and connection reliability in xBASE-T networks. These are components wrapped in the jack that provide transient protection and provide isolation, signal balancing, and impedance matching.

RJ48
It is a type of registered jack connector that uses a twisted wire pair of cables and an eight-pin modular jack for data communication interfaces. The RJ48 uses the same type of plug and socket as we used in the RJ45 connector, but the RJ48 uses a different type of pin-out, where one pair of pins is used to transmit the signal, another pair of pins is used for receiving the signal, another pair of pins is used for draining the signal, and one more pair of pins is left unused. The RJ48 cable is divided into three parts such as the RJ48-C, used for a surface mount like T1 lines and requires 1, 2, 4, and 5 pins. The RJ48-S uses 56 kbps for digital lines of wall mount that use pins 1, 2, 7, and 8. The RJ48-X is used for complex troubleshooting jack requiring 1, 2, 4 and 5 pins.

RJ-48 plug

An RJ-48 plug is often mistaken for RJ-45. On the outside, the two look identical—both are housed in miniature 8-position jacks. The difference is in the wire pairing. RJ-48 connectorIn RJ-48, two of the wires are for transmit, two are for receive, and two are for the drain. The last two wires are reserved for future use.

Three subsets
There are three subsets within RJ-48: RJ-48C, RJ-48X, and RJ-48S. RJ-48C and RJ-48X are very similar, though RJ-48C is more common. Both use lines 1, 2, 4, and 5, and connect T1 lines. RJ-48X connectors, however, have shorting bars. RJ-48S uses lines 1, 2, 7, and 8, and generally connects 56K DDS lines.

Here’s how RJ-48C pinning compares to RJ-48S pinning:

RJ-48C and RJ-48S pinning
Pin RJ-48C                   RJ-48S
1 Receive ring              Receive data +
2 Receive tip                Receive data –
3 No connection          No connection
4 Transmit ring            No connection
5 Transmit tip              No connection
6 No connection          No connection
7 No connection          Transmit data +
8 No connection          Transmit data –

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