ABSTRACT: GR-221 replaces TR-EOP-000221, Issue 1, March 1986, but contains NO TECHNICAL CHANGES from that original document. It has been issued strictly to conform to the new Telcordia Technologies document format and GR process, and carries a new issue number and date.

A microprocessor control system should provide local and/or remote data acquisition, aid in administering plan operation, maintenance and planning, and assistance in reducing overall battery plant energy consumption. The power plant controller covered by this document consists of the following three major functional blocks: the microprocessor-based controller, the hardwired backup controller, and the status indicator panel.

This Generic Requirements document (GR) provides the view of Telcordia on microprocessor-based control systems used in 24-, 48-, 130-, and 140- volt lead-acid straight battery-type central office dc power plants. The document provides generic requirements, design criteria, and information essential for the manufacturer of microprocessor controllers to accommodate the needs of a typical Local Exchange Carrier (LEC).

When using GR-221, you may need to refer to GR-63, GR-151, GR-232, and TR-NWT-000154.