Class 4

(redirected from Class 4 switch)

Class 4

A telephone term for equipment and services that are non-customer facing. The Class nomenclature was coined by AT&T. See tandem switch and Class 5.
References in periodicals archive ?
Northwest Telephone is a Competitive Local Exchange Carrier (CLEC) operating as an integrated telecommunications provider that will initially deploy the OCX to replace a Class 4 switch for existing subscribers.
When asked to rate currently available products on a number of attributes--such as PRI offload, VoIP, Centrex support and Class 4 switch enhancement--the service providers report skepticism about their adequacy.
In addition, it allows our Inter- TollBridge T1 CAS Support Xchange Carrier (IXC) customers to connect directly to a Class 4 switch via T1 CAS for long distance services.