Telephone Extension Cables

Telephone extension cable is a flexible extension lead used to communicate data from a phone or modem to a BT plug. Their extension length allows them to extend the capabilities of the current cable. Copper wires within the extension cable are used to transmit low voltage, high frequency electrical loads across long distances.

Fibre optic cables can also be considered a type of telecommunications cable and are at the cutting edge of communications as they have been designed to handle very high bandwidths.

What are telephone extension cables used for?

Telephone extension cables are used as a way of achieving long-distance communication. This includes telephones, television and computer communications.

Telephone extension cables differ mostly because of their cable connections. BT telephone sockets were introduced into people’s homes so they could have access to a telephone and broadband. There are two types of BT plug connectors, 431A which is 4-way and 631A which is 6-way.

The connector on the telephone is not standard but is typically a RJ11, 6P4C or 6P2C modular connector. In order to use broadband a DSL filter is necessary allowing low frequency noise to not be affected by high frequency data. The RJ11 and ADSL plugs can both connect to the DSL filter by using the sockets provided.

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Description Price Connector A Connector B Length Sheath Colour Shield Type Outer Sheath Material Connector A Type Connector B Type
RS Stock No. 304-6699
BrandRS Pro
£3.35
Each
Units
Male RJ11 Male BT 3m White - - RJ11 BT
RS Stock No. 446-664
BrandRS Pro
£3.14
Each
Units
Male RJ12 Male RJ12 3m Grey - PVC RJ12 RJ12
RS Stock No. 303-1287
BrandRS Pro
£4.18
Each
Units
RJ11 RJ11 3m White - - RJ11 RJ11
RS Stock No. 331-7711
BrandRS Pro
£3.48
Each
Units
Male BT - 15m White - - BT -
RS Stock No. 456-3842
Mfr. Part No.44842
BrandHAMA
£4.15
Each
Units
Modular Plug Modular Plug 1.5m Black - - RJ9 RJ9
RS Stock No. 331-7698
BrandRS Pro
£2.87
Each
Units
Male BT - 5m White - - BT -
RS Stock No. 439-0127
BrandRS Pro
£7.96
Each
Units
Male RJ11 Male BT 5m Grey Unshielded Twisted Pair (UTP) - - -
RS Stock No. 439-0111
BrandRS Pro
£7.86
Each
Units
Male RJ11 Male BT 3m Transparent Unshielded Twisted Pair (UTP) - - -
RS Stock No. 182-4548
BrandRS Pro
£3.41
Each
Units
Male RJ9(4/4) Male RJ9(4/4) 2.5m Grey - - RJ9 RJ9
RS Stock No. 495-0404
BrandRS Pro
£4.86
1 Bag of 3
Bag(s)
Male RJ11 Male BT431A 3m White - - RJ11 BT431A
RS Stock No. 616-2609
Mfr. Part No.11.04.1906-10
BrandRoline
£1.78
Each
Units
RJ12 RJ12 6m Grey Unshielded - 6P4C Plug 6P4C Plug
RS Stock No. 303-1271
BrandRS Pro
£5.80
Each
Units
Male RJ11 Male BT431A 3m White - - RJ11 BT431A
RS Stock No. 495-0505
BrandRS Pro
£8.27
1 Bag of 3
Bag(s)
Male RJ11 Male BT 3m White - - RJ11 BT
RS Stock No. 446-658
BrandRS Pro
£4.30
Each
Units
RJ9 RJ9 3m Grey - PVC RJ9 RJ9
RS Stock No. 446-686
BrandRS Pro
£6.66
Each
Units
Male RJ45 Male RJ45 3m Grey - PVC RJ45 RJ45
RS Stock No. 446-670
BrandRS Pro
£4.26
Each
Units
Male MMJ Male MMJ 3m Grey - PVC MMJ MMJ
RS Stock No. 495-0448
BrandRS Pro
£7.98
1 Bag of 3
Bag(s)
Male RJ9(4/4) Male RJ9(4/4) 2.5m White - - RJ11 RJ11
RS Stock No. 667-3171
BrandRS Pro
£4.96
1 Bag of 3
Bag(s)
UK Plug UK Jack 5m White - - 6-Pin Plug 6-Pin Jack
RS Stock No. 667-3168
BrandRS Pro
£4.88
Each
Units
Male BT Female BT 5m White - - BT BT
RS Stock No. 495-0476
BrandRS Pro
£2.77
1 Bag of 3
Bag(s)
Male RJ9(4/4) Male RJ9(4/4) 5m White - - RJ9 RJ9
Related Products
Standard telephone extensions featuring a male T-plug on ...
Description:
Standard telephone extensions featuring a male T-plug on one end and a female T-socket on the other. This assembly allows for a telephone to be moved without modifying the installation.Available in 5 and 10 metre lengths.
These telephone cords have pins and wiring specific ...
Description:
These telephone cords have pins and wiring specific to different types of telephones. They are all equipped with RJ11 6//4 or 6//6 connectors at one end and a T-piece connector at the other end.All the cords measure 3 metres and are available in different colours.
Pre-terminated IP67 connectors, wire-to-wire with 1m of wire. ...
Description:
Pre-terminated IP67 connectors, wire-to-wire with 1m of wire. Latch mechanism prevents misalignment and unintentional disconnection Lightweight, high impact, flame retardant (UL94-VO) PBT housings. Suitable for wire-to-wire connection up to 3A Tin-plated phosphor-bronze contactsInsulator withstand voltage: 100Va.c. Rated Voltage: 250Va.c. Silicone rubber wire housing seal Contact resistance: 10mΩ max. Insulation resistance: ...
The gold plated hermaphroditic contacts with-in these connectors ...
Description:
The gold plated hermaphroditic contacts with-in these connectors offer gas tight mating surfaces and ultra reliable connectivity, the connectors can be board mounted or in-line mounted, the clip provided allows secure panel fastening of the mated connectors when used in-line. Contact rating 8.5AContact resistance 6 milliohms max.Insulation resistance 5,000 megaohms ...