Telephone Cable

A telephone cable is a type of electrical wire designed specifically for transmitting voice and low-speed data signals for telecommunications. Its primary function is to connect landline telephones, modems, fax machines, and other similar devices to the telephone network.

The most common type of phone cable used to connect a device to a wall socket is an RJ11 cable, which features small, plastic RJ11 connectors on each end. This essential phone line cable is constructed with one or more twisted pairs of insulated copper wires that carry the audio signal.

What is a Telephone Cable Used for?

A telephone cable is the standard wiring used to connect devices to the analogue public telephone network. While its primary role is to transmit voice signals for landline telephones, this versatile phone line cable also supports various low-speed data and signalling applications.

Common uses for a phone cord include:

• Landline Telephones: Connecting standard home phones and office telephone systems (PABX) to a wall socket.
• Internet Access: Providing the essential connection for ADSL and VDSL broadband modems, which utilise the existing copper phone line infrastructure.
• Payment Terminals: Linking EFTPOS machines and credit card readers to the network for processing transactions.
• Fax Machines: Transmitting and receiving documents over the telephone network.
• Alarm & Security Systems: Connecting building security panels to a monitoring service for alarm reporting and communication.

Types of Telephone Cables

Different types of phone cables are used for specific parts of a telephone installation.

1. Flat Telephone Cable

This is the most common type of phone cord used to connect a telephone or modem directly to a wall socket. It is flat and flexible, typically containing two or four thin copper wires. These are almost always terminated with RJ11 connectors, making it a standard RJ11 telephone cable.

2. Twisted Pair Cable

This type of telephone wire is used for the structured wiring inside walls that runs from the main distribution point to individual wall sockets. While modern data networks use Cat5e or Cat6, traditional telephone wiring uses Cat3 twisted pair cable, which is designed to minimise interference and ensure clear voice quality over longer distances.

3. Coiled Handset Cord

This is the familiar curly phone cord that connects the telephone handset to the main body of the phone. It is designed to be flexible and retractable. Note that it uses smaller RJ9, RJ10, or RJ22 connectors, which are not compatible with the RJ11 wall socket.

4. Telephone Extension Cable

A telephone extension cable, also known as a phone extension cord, is a simple solution for increasing the distance between your telephone and the wall socket. It comes pre-fitted with a male RJ11 plug on one end and a female socket on the other.

What Type of Phone Line Cable Do I Need?

Choosing the right phone line cable depends on your specific task. Whether you are connecting a device, installing new wiring, or extending an existing connection will determine the type of cable you need.

• For Connecting a Device: To connect a standard telephone, modem, or fax machine to an existing wall socket, you need a pre-terminated telephone cable. Look for a phone cord with RJ11 connectors, as this is the standard in Australia for plug-and-play connections.
• For Extending a Connection: If your current cable is too short, the easiest solution is a telephone extension cord. These are designed with a plug on one end and a socket on the other. Alternatively, a small RJ11 coupler can join two standard phone cables.
• For New Installations in Walls: When running new telephone wire inside walls for new phone points, you will need bulk, unterminated twisted-pair cable (like Cat3). This infrastructure cable is installed by a technician and terminated into wall sockets.
• For Outdoor or Harsh Environments: If a phone line needs to be run outside or in a damp area, it is essential to use an external-grade telephone cable. These feature a durable, weather-resistant outer jacket that protects the internal wires from moisture and UV damage.

Terminated and Unterminated Phone Cables

Telephone cables are available in two main forms: terminated and unterminated.

• Terminated: A terminated phone cable comes ready-to-use with connectors professionally attached at the factory. This includes standard RJ11 phone cable patch cords and any phone extension cable. They offer convenience and reliability for plug-and-play applications.
• Unterminated: This refers to bulk telephone cable supplied on a reel or in a box without any connectors. It is used by technicians and installers to create custom-length wiring runs within a building. This type of cable requires specialised tools to cut, strip, and terminate the wires into wall sockets or connectors.

How to Extend a Phone Cable

If your telephone cord isn't long enough to reach, you have a few simple options to extend it:

1. Use a Telephone Extension Cable: The most straightforward method is to use a telephone extension cord. These cables are designed for this purpose, with a male plug on one end to plug into the wall socket and a female socket on the other to plug your existing phone cable into.
2. Use an RJ11 Coupler: A coupler is a small, inexpensive adapter with two female RJ11 sockets. It allows you to join two standard phone cables together to create a longer single cable.
3. Replace the Cable: For the cleanest connection with the least potential for signal loss, simply replace your current phone line cord with a new, longer one.

Industrial Applications of Telephone Cables

While often associated with home use, the telephone line cable remains a crucial component in many business and industrial applications.

Office and Business Telephony

Telephone cables are the backbone of traditional office phone systems (PABX/PBX). It's used to connect handsets, conference phones, and multi-line systems throughout a commercial building, providing reliable voice communication for daily operations.

Retail and Point of Sale (POS)

In the retail sector, a dedicated phone line cable is essential for connecting EFTPOS and credit card terminals to the network for processing transactions. It also supports fax machines and alarm systems that rely on a phone line.

Industrial Control and Alarm Systems

In some industrial environments, the simplicity and reliability of a telephone wire are leveraged for low-speed data and signalling. It is often used for alarm panels, access control systems, and basic machine-to-machine (M2M) communication where high bandwidth is not required.

Data Communications (DSL)

In many parts of Australia, the existing copper telephone cable infrastructure is still used to deliver DSL (ADSL/VDSL) broadband internet services to homes and businesses, connecting the modem to the wider network.

Buy Telephone Cable Online from RS

RS is a trusted supplier and distributor of telephone cables in Australia, offering a wide selection of telecommunication solutions from leading brands. We stock high-quality products from trusted names like Decelect, CAE Groupe and RND. Our competitively priced inventory supports a variety of needs—from a simple phone extension cord for the home office to bulk telephone wire for large-scale installations—with proven quality and reliability.

In addition to our range of phone cables, we also stock all the essential components, including proximity sensors, cable trunking and industrial connectors to support a full system build or repair.

Order your telephone cord and accessories online today and enjoy fast, nationwide doorstep delivery. For details on how to place your order, estimated delivery times, and service fees for your location in Australia, please refer to ourDelivery Page.