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 IP Rating Series Voltage Rating
RS Stock No. 446-664
BrandRS PRO
kr 55,33
Each
Units
Male RJ12 Male RJ12 3m Grey - PVC - - -
RS Stock No. 495-0404
BrandRS PRO
kr 23,743
Each (In a Bag of 3)
Units
Male RJ11 Male BT431A 3m White - - - - -
RS Stock No. 182-4532
BrandRS PRO
kr 53,19
Each
Units
Male RJ9(4/4) Male RJ9(4/4) - Cream - - - - -
RS Stock No. 439-0111
BrandRS PRO
kr 116,43
Each
Units
Male RJ11 Male BT 3m Transparent Unshielded Twisted Pair (UTP) - - - -
RS Stock No. 439-0127
BrandRS PRO
kr 118,03
Each
Units
Male RJ11 Male BT 5m Grey Unshielded Twisted Pair (UTP) - - - -
RS Stock No. 495-0460
BrandRS PRO
kr 38,923
Each (In a Bag of 3)
Units
RJ9 (4/4) RJ9 (4/4) 2.5m Grey - - - - -
RS Stock No. 303-1287
BrandRS PRO
kr 59,55
Each
Units
RJ11 RJ11 3m White - - - - -
RS Stock No. 303-1271
BrandRS PRO
kr 30,82
Each
Units
Male RJ11 Male BT431A 3m White - - - - -
RS Stock No. 182-4560
BrandRS PRO
kr 59,55
Each
Units
Male RJ9(4/4) Male RJ9(4/4) 5m White - - - - -
RS Stock No. 667-3165
BrandRS PRO
kr 40,87
Each
Units
Male BT Female BT 3m White - - - - -
RS Stock No. 667-3171
BrandRS PRO
kr 24,277
Each (In a Bag of 3)
Units
UK Plug UK Jack 5m White - - - - -
RS Stock No. 495-0505
BrandRS PRO
kr 40,447
Each (In a Bag of 3)
Units
Male RJ11 Male BT 3m White - - - - -
RS Stock No. 446-670
BrandRS PRO
kr 59,47
Each
Units
Male MMJ Male MMJ 3m Grey - PVC - - -
RS Stock No. 446-686
BrandRS PRO
kr 90,37
Each
Units
Male RJ45 Male RJ45 3m Grey - PVC - - -
RS Stock No. 495-0448
BrandRS PRO
kr 39,04
Each (In a Bag of 3)
Units
Male RJ9(4/4) Male RJ9(4/4) 2.5m White - - - - -
RS Stock No. 446-658
BrandRS PRO
kr 61,43
Each
Units
RJ9 RJ9 3m Grey - PVC - - -
RS Stock No. 331-7698
BrandRS PRO
kr 42,12
Each
Units
Male BT - 5m White - - - - -
RS Stock No. 666-7564
Mfr. Part No.520210003ASSY
BrandEDAC
kr 76,48
Each (In a Bag of 2)
Units
3 Way Male Wire to Board Free End 1m White - - - - -
RS Stock No. 252-9991
Mfr. Part No.CT1136401I
kr 71,58
Each
Units
Male RJ11 - 3m - - - - - -
RS Stock No. 252-9890
Mfr. Part No.CP162446I
kr 57,13
Each
Units
Male RJ9 Male RJ9 1.5m Multicoloured - - - - -