Impulse metering at local telephone switching offices in a DAMA DOMSAT communication system involves the storage of billing rate information in the control computer equipment at a master station. This billing information is maintained in the form of a look-up table containing all billing rates to apply...http://www.google.de/patents/US4273962?utm_source=gb-gplus-sharePatent US4273962 - Impulse metering of local telephone switching offices via a DAMA DOMSAT communication system
