e/Class 4 telephone switch

Information
has gloss	eng: A Class 4 or Tandem telephone switch is a U.S. telephone company central office telephone exchange used for long distance communications in the Public Switched Telephone Network (PSTN) to interconnect telephone company offices. In contrast, a Class 5 telephone switch or end-office is primarily used to terminate local calls; in other words connect to the customer (also known as the subscriber). A tandem is a telephone switch to which no telephones are wired; its services are termed non-customer facing. Other terms are toll centers (TC), if operators are present, otherwise they are toll points (TP). Class 4 switches at that time often had an associated Traffic Service Position System (TSPS) to handle operator calls. After the Bell System Divestiture the class was called Access Tandems...
lexicalization	eng: Class 4 telephone switch
instance of	(noun) a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication central, telephone exchange, exchange