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on station-to-station, station-to-trunk, trunk-to-trunk, trunk- <br />to-station, and all console functions are also performed. <br />Features of the CENTREX are tested on a per-station and per- <br />trunk basis. <br /> <br />CENTRAL OFFICE CENTREX DESIGN BASED ON PROVEN TECHNOLOGY <br />Reliability begins with a design based on sound, proven <br />technology. The CENTREX uses Bell Telephone Laboratories <br />technologies that its engineers have designed in which optimum <br />reliability is a proven standard. Types of Central Office <br />CENTREX Systems have been in operation for over twenty (20) <br />years. Beyond this standard, options are designed to extend <br />system reliability. Part of designing for reliability is <br />designing the most cost-effective optimum system configuration <br />for each customer. Any additional cost of redundancy is voided <br />with a Central Office CENTREX System as the CTX switching <br />mechanism is intricately tied to the overall Central Office <br />operations at no additional charge to the customer. Each <br />Central Office is equipped with its own uninterruptable power <br />source which includes battery and diesel operated generator <br />capabilities. <br /> <br />SELF MAINTENANCE <br />In the Central Office, a CENTREX spends a lot of time checking <br />its own health. Its control program regularly runs preventive <br />maintenance routines and diagnostic tests while continuing to <br />process calls. <br /> <br />The system reports the results of its maintenance activity <br />through status indicator, alamrs, and internal data logging. <br />Visual status indicators and alarms on a Central Office alarm <br />panel and on the customer's console identify failures quickly. <br /> <br />If a failure cannot be corrected or circumvented by the CTX <br />system, CENTREX generated records that will identify the <br />problem. If the problem cannot be cleared in the Central <br />Office, a maintenance person can be dispatched to the <br />customer's site with information that will directly assist in <br />trouble correction. <br /> <br />CONTINUING CENTRAL OFFICE CENTREX DESIGN <br />Design does not end with manufacturing. It is part of a <br />continuing process of product evaluation and response to <br />evaluation. Data is continually collected from factory testing <br />and field investigation, and analyzed in relation to design <br />specification. Where product performance can be improved at <br />reasonable cost, design refinements are made. <br /> <br />Designing for reliability is an essential part - but only a <br />part - of the reliability structure of the CENTREX. After <br />design, stringent manufacturing standards ensure that the <br />designed excellence of CENTREX is faithfully produced. <br /> <br />INSTALLATION TESTING <br />Trained Pacific Telephone and/or Western Electric Company <br /> <br /> <br />