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- Director_telephone_system abstract "The Director telephone system was a development of the step by step (SXS) or Strowger system used in London and five other large cities in Britain from the 1920s to the 1960s. In a large city area the main characteristic of the telephone traffic is that a large proportion (70% to 80%) is outgoing traffic, and it is not concentrated to one main exchange but is to a number of exchanges. Hence a non-director SXS exchange system is not suitable for these areas.The “translation” facility incorporated was similar to the register in common control systems. Hence the Director system incorporates two features of the Panel system being introduced in large American cities, and which were required regardless of the type of exchange system for these large areas which would have a mixture of manual and automatic exchanges for some years. Customers were given seven-digit numbers, with the first three digits spelling out the (local) exchange name; this expedited call handling particularly to and from manual exchanges. Direct or tandem junction routes to other exchanges could be allocated as required, with routing independent of the telephone number and able to be altered at any time to cater for traffic growth or the introduction of new local or tandem exchanges.Each local exchange incorporated up to eight groups of directors which translated the first three digits (ABC digits) comprising the exchange name into a pulse train of one to six digits, as required for each exchange and unique to that exchange. The translated digits were sent to the code selectors, and then the four numeric digits were sent to three switching stages in the terminating exchange (two group selectors and a final selector). Hence local calls within the exchange and busy direct junction routes to exchanges with high traffic from that exchange could be trunked via one code selection stage, which reduced both the setting-up time and the total numbers of selectors required in the network. Distant exchanges which did not justify direct junction routes could be called via one or more tandem exchanges; being routed via one, two or three local code selectors in the originating exchange, one or more selectors in the tandem exchange(s), and finally the numeric selection stages in the terminating exchange for the last four digits, which were stored and forwarded without translation.".
- Director_telephone_system thumbnail GPO_232_Telephone_without_bell_set_26.JPG?width=300.
- Director_telephone_system wikiPageExternalLink histuk.htm.
- Director_telephone_system wikiPageID "652431".
- Director_telephone_system wikiPageRevisionID "605694589".
- Director_telephone_system hasPhotoCollection Director_telephone_system.
- Director_telephone_system subject Category:History_of_telecommunications.
- Director_telephone_system subject Category:History_of_telecommunications_in_the_United_Kingdom.
- Director_telephone_system subject Category:Telephone_exchanges.
- Director_telephone_system type Central102994858.
- Director_telephone_system type GeographicPoint108578706.
- Director_telephone_system type Location100027167.
- Director_telephone_system type Object100002684.
- Director_telephone_system type PhysicalEntity100001930.
- Director_telephone_system type Point108620061.
- Director_telephone_system type TelephoneExchanges.
- Director_telephone_system type Workplace104602044.
- Director_telephone_system type YagoGeoEntity.
- Director_telephone_system type YagoLegalActorGeo.
- Director_telephone_system type YagoPermanentlyLocatedEntity.
- Director_telephone_system comment "The Director telephone system was a development of the step by step (SXS) or Strowger system used in London and five other large cities in Britain from the 1920s to the 1960s. In a large city area the main characteristic of the telephone traffic is that a large proportion (70% to 80%) is outgoing traffic, and it is not concentrated to one main exchange but is to a number of exchanges.".
- Director_telephone_system label "Director telephone system".
- Director_telephone_system sameAs m.02_s4q.
- Director_telephone_system sameAs Q5280582.
- Director_telephone_system sameAs Q5280582.
- Director_telephone_system sameAs Director_telephone_system.
- Director_telephone_system wasDerivedFrom Director_telephone_system?oldid=605694589.
- Director_telephone_system depiction GPO_232_Telephone_without_bell_set_26.JPG.
- Director_telephone_system isPrimaryTopicOf Director_telephone_system.
