About: Number Five Crossbar Switching System

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The Number Five Crossbar Switching System (5XB switch) is a telephone switch for telephone exchanges designed by Bell Labs and manufactured by Western Electric starting in 1947. It was used in the Bell System principally as a Class 5 telephone switch in the public switched telephone network (PSTN) until the early 1990s, when it was replaced with electronic switching systems. Variants were used as combined Class 4 and Class 5 systems in rural areas, and as a TWX switch.

Attributes	Values
rdfs:label	Number Five Crossbar Switching System (en)
rdfs:comment	The Number Five Crossbar Switching System (5XB switch) is a telephone switch for telephone exchanges designed by Bell Labs and manufactured by Western Electric starting in 1947. It was used in the Bell System principally as a Class 5 telephone switch in the public switched telephone network (PSTN) until the early 1990s, when it was replaced with electronic switching systems. Variants were used as combined Class 4 and Class 5 systems in rural areas, and as a TWX switch. (en)
foaf:depiction
dcterms:subject	History of the telephone Telephone exchange equipment
Wikipage page ID	8222445 (xsd:integer)
Wikipage revision ID	1120102778 (xsd:integer)
Link from a Wikipage to another Wikipage	Electronic switching system Bell Labs Bell System E and M signaling History of the telephone Cord circuit Crossbar switch TSPS Pallet Panel switch Party line (telephony) Western Electric Class 4 telephone switch Class 5 telephone switch Class of Service Junctor Line signaling 1ESS switch Telephone exchange equipment Centrex Direct distance dialing Telephone exchange Register signaling Telephone lines Telegraphy Teletype Corporation Tip and ring Automatic message accounting Autovon Marker (telecommunications) Multi-frequency Public switched telephone network Off-hook Wire spring relay Stored program control exchange Two-out-of-five code Picturephone Line signalling IDDD 1XB 1XB switch Coin phone Answer supervision Multilevel precedence and preemption
Link from a Wikipage to an external page	http://www.telephonetribute.com/switches_survey_chapter_7.html
sameAs	Number Five Crossbar Switching System Number Five Crossbar Switching System Number Five Crossbar Switching System
dbp:wikiPageUsesTemplate	dbt:Refimprove dbt:Telephone_Switches
thumbnail	wiki-commons:Special:FilePath/5xb-wiki-junctors.svg?width=300
has abstract	The Number Five Crossbar Switching System (5XB switch) is a telephone switch for telephone exchanges designed by Bell Labs and manufactured by Western Electric starting in 1947. It was used in the Bell System principally as a Class 5 telephone switch in the public switched telephone network (PSTN) until the early 1990s, when it was replaced with electronic switching systems. Variants were used as combined Class 4 and Class 5 systems in rural areas, and as a TWX switch. 5XB was originally intended to bring the benefits of crossbar switching to towns and small cities with only a few thousand telephone lines. The typical starting size was 3000 to 5000 lines, but the system had essentially unlimited growth capacity. The earlier 1XB urban crossbar was impractically expensive in small installations, and had difficulties handling large trunk groups. 5XB was converted to wire spring relays in the 1950s and otherwise upgraded in the 1960s to serve exchanges with tens of thousands of lines. The final 5A Crossbar variant, produced starting in 1972, was available only in sizes of 990 and 1960 lines, and generally delivered on one pallet, rather than assembled on site as usual for larger exchanges. (en)
prov:wasDerivedFrom	wikipedia-en:Number_Five_Crossbar_Switching_System?oldid=1120102778&ns=0
page length (characters) of wiki page	23304 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Number_Five_Crossbar_Switching_System
is Link from a Wikipage to another Wikipage of	5XB switch Bell Labs Number One Crossbar Switching System Connections Museum Panel call indicator Junctor Palo Alto, California Tech Model Railroad Club Push-button telephone Automatic call distributor Autovon Marker (telecommunications) List of telephone switches LCR 5XB 5XB Switch 5xb switch No. 5 Crossbar
is Wikipage redirect of	5XB switch 5XB 5XB Switch 5xb switch No. 5 Crossbar
is foaf:primaryTopic of	wikipedia-en:Number_Five_Crossbar_Switching_System

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