Recommended Maintenance Routines and Frequencies for Central Office Backup Power
|Publication Date:||1 October 2018|
This guidance document recommends a baseline set of routines along with maintenance intervals (frequency) for central office back up power.
While the Communications Security, Reliability and Interoperability Council (CSRIC) Best Practices include some recommendations for engine-alternator maintenance in telecommunications central offices, and Telcordia GR-513- CORE contains suggested frequencies (as well as some specific routines) for battery, rectifier, and engine routines; there are no comprehensive guidelines for telecommunications power equipment maintenance routines and frequencies. Further complicating the issue is that there are other existing standards primarily designed for other industries that suggest maintenance activities that are far too frequent for telecommunications needs. For example, NFPA 110 is primarily designed for emergency engine-alternators used in life support applications (like hospitals) where there are no alternatives or secondary means to provide the required service. Communications networks and services are usually designed with duplicate pathways and alternative means (e.g., batteries plus standby engines) to circumvent single point failures. The weekly test routine requirements stated in NFPA 110 for such lifesupport engines far exceed FCC-recognized (CSRIC) Best Practices. Engine alternators deployed in central office applications are considered NFPA 110 Level 2. In a similar vein, manufacturers make similar products (such as engine-alternators and batteries) for differing industries, and what might be a good maintenance frequency or routine for one application (such as battery maintenance for critical backup systems at a nuclear generating station) might be excessive for another application (e.g., a telecommunications central office) into which the same battery is sold. The manufacturer's guidelines for maintenance are generally forced to err on the side of the most frequent maintenance applications and routines, resulting in an unnecessary waste of resources. For this reason, these guidelines provide some useful maintenance frequencies and baseline routines specific to telecommunications Central Office backup power systems.