Definition

Noun: 1. A type of telephone exchange system: Centrex is a telecommunications service where the switching equipment is located at the telephone company's central office, rather than on the customer's premises. It provides businesses with features similar to a private branch exchange (PBX) but managed by the service provider.

Usage

• Centrex is used as a singular noun to refer to the specific service or system.
• It is often used in business, telecommunications, and technical contexts.

Examples

• Noun:
  • The company upgraded its phone system to a centrex service.
  • Centrex offers features like call forwarding and direct inward dialing without requiring on-site hardware.

Advanced Usage

• "Centrex line": Refers to an individual telephone line provided through the Centrex service.
  • Each department head has a dedicated centrex line.
• "Centrex service": The complete package or subscription to the Centrex system.
  • We are evaluating the cost of our centrex service versus a new PBX.

Variants and Related Words

• Central Office (CO): The telephone company facility where the Centrex switching equipment is housed.
• PBX (Private Branch Exchange): An on-premises telephone switching system, often contrasted with Centrex.

Synonyms

• Central exchange service
• Hosted PBX (Note: This is a more modern, often internet-based equivalent, but the core service concept is similar.)

Notes

• The term is a proprietary name that became generic (like "Kleenex" for tissues). It is derived from "CENTRal EXchange".
• It is typically not used in general conversation but is standard terminology within the telecommunications industry.

Noun

1. (CENTRal EXchange) a kind of telephone exchange