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Statements

Subject Item
dbr:Class-4_telephone_switch
rdf:type
dbo:Company
rdfs:label
Class-4 telephone switch
rdfs:comment
A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the public switched telephone network.
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dbc:Telephone_exchange_equipment
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8289819
dbo:wikiPageRevisionID
1104331625
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dbr:Trunk_(telecommunications) dbr:Time-division_multiplexing dbr:Telephone_company dbr:T-carrier dbr:PSTN_network_topology dbr:Crossbar_switch dbr:Bell_System_divestiture dbr:Telephone_exchange dbr:Local_access_and_transport_area dbr:FCAPS dbc:Telephone_exchange_equipment dbr:Long_distance_calling dbr:Tandem dbr:Trunk_vs_Toll dbr:Local_exchange_carrier dbr:Four-wire_circuit dbr:Western_Electric dbr:Class-5_telephone_switch dbr:DMS-100 dbr:TSPS dbr:Toll_switching_trunk dbr:Destination_routing dbr:Circuit-switched dbr:Public_switched_telephone_network dbr:Digital_Multiplex_System dbr:OC-3 dbr:Automatic_Message_Accounting dbr:Number_One_Crossbar_Switching_System dbr:4ESS_switch dbr:Interexchange_carrier dbr:Switchboard_operator dbr:Chicago dbr:Twisted_pair dbr:Point_of_presence dbr:5ESS_switch dbr:SP-1_switch
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n8:0,2542,t=tandem+switch&i=52544,00.asp n13:switches_survey_chapter_8.html%7Caccessdate=August
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dbo:abstract
A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the public switched telephone network. A class-4 switch does not connect directly to telephones; instead, it connects to other class-4 switches and to class-5 telephone switches. The telephones of service subscribers are wired to class-5 switches. When a call is placed to a telephone that is not on the same class-5 switch as the originating subscriber, the call may be routed through one or more class-4 switches to reach its destination.
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dbr:Telephone
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wikipedia-en:Class-4_telephone_switch?oldid=1104331625&ns=0
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wikipedia-en:Class-4_telephone_switch