Digital exchange system with function of displaying operation state of system
Реферат: According to this invention, in a digital key telephone system which is connected to a digital network via a digital channel, a transmission error which has occurred on the digital channel is detected, and upon detection of the transmission error, information representing the transmission error is stored in an error table. When a display request of a transmission error is input from a digital key telephone, error information stored in the error table is read out, the readout information is transferred to the digital key telephone, and the information is displayed on a display of the telephone.
Multimedia information exchanging system
Номер патента: CA1292052C. Автор: Noboru Mizuhara,Takashi Morita,Tohru Hoshi. Владелец: HITACHI LTD. Дата публикации: 1991-11-12.