A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices...

A Class-5 telephone switch is a telephone exchange in the public switched telephone network (PSTN) that directly serves subscribers and manages subscriber...

A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network...

The 5ESS Switching System is a Class 5 telephone electronic switching system developed by Western Electric for the American Telephone and Telegraph Company...

Class 4 2-6-0, British steam locomotive BR Standard Class 4 2-6-4T, British steam locomotive Class 4 telephone switch Class 4, contribution class in the...

Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188). Class-4 telephone switch v t e...

This list of telephone switches is a compilation of telephone switches used in the public switched telephone network (PSTN) or in large enterprises. Centura...

The No. 4 Electronic Switching System (4ESS) is a class 4 telephone electronic switching system that was the first digital electronic toll switch introduced...

(software switch) is a call-switching node in a telecommunications network, based not on the specialized switching hardware of the traditional telephone exchange...

The GTD-5 EAX (General Telephone Digital Number 5 Electronic Automatic Exchange) is the Class 5 telephone switch developed by GTE Automatic Electric Laboratories...

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...

telephone number. In the areas of the North American Numbering Plan, Class-4 telephone switches are the interchange points between numbering plan areas. v t e...

implementations achieved the same switching topology in solid-state electronics. The crossbar switch is one of the principal telephone exchange architectures, together...

would allow the Los Angeles operator to dial via the tandem switch (i.e., class-4 telephone switch) to the Mount Pleasant operator's switchboard, and have...

electromechanical telephone switching systems. Because of the abundance of rotary dial equipment still on use well into the 1990s, many telephone keypads were...

PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN). In the United...

the design of large networks of switches, as for example used in telephone exchanges. In the simplest case, a switch has two conductive pieces, often...

IMA2 switch. It then produced the ITS-5 switch, which met the Class-5 telephone switch requirements, the ITS-4 switch, which met the Class-4 telephone switch...

Rural/Urban digital loop carrier, the DMS-10 telephone switch, the DMS SuperNode family of telephone switches (DMS-100, DMS-200, DMS-250, DMS-300, DMS-500...

gateway" refers to the Class-4 telephone switches these gateways often connect to, which are also referred to as "trunking switches" because of their use...

Crossbar Switching System (1XB), was the primary technology for urban telephone exchanges served by the Bell System in the mid-20th century. Its switch fabric...

switching systems Class 4 - Toll-access switching systems Class 5 - End-office switching systems Class 5 end-office switches provide local telephone service...

Electric No. 4 Crossbar Switching System in Philadelphia to commercial service, in August 1943, automated the process of forwarding telephone calls between...

interconnection method in the 21st century, used with the Lucent 5ESS Class-5 telephone switch to present day), microwave radio relay and ultimately fiber-optic...

others. Social factors like class, religion, gender, and age influence the pattern of language that is used and switched between. There are three different...

ringers. The GTD-5 EAX, GTE Automatic Electric's digital class 4/5 central office telephone switch, was first deployed on June 26, 1982. GTE Automatic Electric...

Class 5 end office circuit switch systems and Class 4 toll access circuit switch systems that were connected to Class 3 primary toll circuit switch systems...

the need for telephone operators to manually record calls. Modern ANI has two components: information digits, which identify the class of service, and...

"Confessions of a Telephone Girl" Montana: The Magazine of Western History 47.4 (1997): 68–75. online Kenneth Lipartito, "When Women Were Switches: Technology...

an international gateway exchange is a telephone switch that forms the gateway between a national telephone network and one or more other international...