Patent ID: 6831967
Filing Date: 2004-12-14
Classification: H04M

Abstract:
A method for producing two back up copies of call charge data, stored in a disk storage, of a telephone switching office, the method comprising the steps of:reading a first individual data block only a single time from the disk storage; transmitting the first individual data block that is read only a single time, together with a write order, simultaneously to both a first mass storage and to a second mass storage; receiving an acknowledgement by both the first and second mass storages; reading a next data block only a single time from the disk storage; and transmitting the next data block, together with a write order, to both the first and second mass storages after receipt of the acknowledgment, and repeating the procedure of reading the next data block only a single time and transmitting the next data block, together with a write order, simultaneously to both the first and second mass storages, until the the two backup copies are produced.