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- Number_Five_Crossbar_Switching_System abstract "The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though variants were used as combined class 4/5 in rural areas and as a TWX switch. 5XB was originally intended to bring the benefits of crossbar switching to small towns with only a few thousand telephone lines. 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 in the early 1970s returned to its roots, being available only in sizes of 960 and 1920 lines, and generally delivered on one pallet rather than assembled on site as usual for larger exchanges.".
- Number_Five_Crossbar_Switching_System thumbnail Crossbar-200pt-hy3.jpg?width=300.
- Number_Five_Crossbar_Switching_System wikiPageExternalLink No_5_Crossbar_Circuit_Description_SCD-10-01_r_OCR_r.pdf.
- Number_Five_Crossbar_Switching_System wikiPageExternalLink switches_survey_chapter_7.html.
- Number_Five_Crossbar_Switching_System wikiPageID "8222445".
- Number_Five_Crossbar_Switching_System wikiPageRevisionID "592539854".
- Number_Five_Crossbar_Switching_System hasPhotoCollection Number_Five_Crossbar_Switching_System.
- Number_Five_Crossbar_Switching_System subject Category:History_of_the_telephone.
- Number_Five_Crossbar_Switching_System subject Category:Telephone_exchange_equipment.
- Number_Five_Crossbar_Switching_System type Central102994858.
- Number_Five_Crossbar_Switching_System type GeographicPoint108578706.
- Number_Five_Crossbar_Switching_System type Location100027167.
- Number_Five_Crossbar_Switching_System type Object100002684.
- Number_Five_Crossbar_Switching_System type PhysicalEntity100001930.
- Number_Five_Crossbar_Switching_System type Point108620061.
- Number_Five_Crossbar_Switching_System type TelephoneExchanges.
- Number_Five_Crossbar_Switching_System type Workplace104602044.
- Number_Five_Crossbar_Switching_System type YagoGeoEntity.
- Number_Five_Crossbar_Switching_System type YagoLegalActorGeo.
- Number_Five_Crossbar_Switching_System type YagoPermanentlyLocatedEntity.
- Number_Five_Crossbar_Switching_System comment "The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though variants were used as combined class 4/5 in rural areas and as a TWX switch. 5XB was originally intended to bring the benefits of crossbar switching to small towns with only a few thousand telephone lines.".
- Number_Five_Crossbar_Switching_System label "Number Five Crossbar Switching System".
- Number_Five_Crossbar_Switching_System sameAs m.026wqd8.
- Number_Five_Crossbar_Switching_System sameAs Q7069514.
- Number_Five_Crossbar_Switching_System sameAs Q7069514.
- Number_Five_Crossbar_Switching_System sameAs Number_Five_Crossbar_Switching_System.
- Number_Five_Crossbar_Switching_System wasDerivedFrom Number_Five_Crossbar_Switching_System?oldid=592539854.
- Number_Five_Crossbar_Switching_System depiction Crossbar-200pt-hy3.jpg.
- Number_Five_Crossbar_Switching_System isPrimaryTopicOf Number_Five_Crossbar_Switching_System.
