Local loop: Difference between revisions

Revision as of 02:56, 8 July 2013

Revision as of 06:08, 8 July 2013

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== Infrastructure ==

Traditionally, the local loop was an [[electrical circuit]] carried by a single pair of conductors from the telephone on the customer's premises to the local [[telephone exchange]]. [[Single- wire earth return|Single-Wire Earth Return]] [SWER] lines had been used until the introduction of electric tramways from the 1900s made them unusable.

Historically the first section was often an aerial open-wire line, with several conductors attached to porcelain insulators on cross-arms on "telegraph" poles. Hence [[party line (telephony)|party line]] service was often given to residential customers to minimise the number of local loops required. Usually all these circuits went into aerial or buried cables with a [[twisted pair]] for each local loop nearer the exchange, see [[outside plant]].