About: Director telephone system

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The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges. A non-director SXS exchange system is not suitable for these areas.

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rdf:type	yago:WikicatTelephoneExchanges yago:Central102994858 yago:GeographicPoint108578706 yago:Location100027167 yago:Object100002684 yago:PhysicalEntity100001930 yago:Point108620061 yago:Workplace104602044 yago:YagoGeoEntity yago:YagoLegalActorGeo yago:YagoPermanentlyLocatedEntity
rdfs:label	Director telephone system (en)
rdfs:comment	The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges. A non-director SXS exchange system is not suitable for these areas. (en)
foaf:depiction
dcterms:subject	History of telecommunications in the United Kingdom History of telecommunications Telephone exchanges
Wikipage page ID	652431 (xsd:integer)
Wikipage revision ID	1085852572 (xsd:integer)
Link from a Wikipage to another Wikipage	Electronic switching system History of telecommunications in the United Kingdom Bell System All-figure dialling United States Independent telephone company Number One Crossbar Switching System Telephone number GTE Los Angeles Common control Panel switch Strowger switch Telephone numbering plan Western Electric Wimbledon, London Linked numbering scheme Rotary dial History of telecommunications Telephone exchanges Coded-Call Indicator Rotary system Sender List of telephone exchanges in London Telephone exchange names Telephony in Greater Manchester
Link from a Wikipage to an external page	http://www.britishtelephones.com/histuk.htm
sameAs	Director telephone system Director telephone system Director telephone system Director telephone system
dbp:wikiPageUsesTemplate	dbt:Convert dbt:Frac dbt:Gaps dbt:ISBN dbt:Lead_rewrite dbt:Main dbt:OCLC dbt:Reflist dbt:Telecommunications
thumbnail	wiki-commons:Special:FilePath/GPO_232_Telephone_without_bell_set_26.jpg?width=300
has abstract	The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges. A non-director SXS exchange system is not suitable for these areas. As the translation facility incorporated was similar to the register in common control systems, the director system incorporates two features of the Panel system, which was 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. Customer stations were assigned 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 number 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. (en)
gold:hypernym	Development
prov:wasDerivedFrom	wikipedia-en:Director_telephone_system?oldid=1085852572&ns=0
page length (characters) of wiki page	21445 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Director_telephone_system
is Link from a Wikipage to another Wikipage of	All-figure dialling CCI Number One Crossbar Switching System Timeline of telephone companies in Birmingham 020 Telephone number Telephone numbers in Australia Trunk versus toll telephony General Post Office Call logging Common control Panel call indicator Strowger switch Timeline of London (1900s) Linked numbering scheme Notting Hill Dialling (telephony) History of telephone numbers in the United Kingdom BT Archives Highgate Wood telephone exchange Automatic Telephone Manufacturing Company Group switching centre Merton Abbey, London Rotary system Subscriber trunk dialling Sender Director List of telephone exchanges in London Non-dialable point UK telephone code misconceptions Telephone numbers in the Republic of Ireland Telephony in Greater Manchester Director area Director exchange

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