摘要:
pulse supply for several subscriber lines to be supplied independently in a telephone system is disclosed. So as to limit the voltage ripple on the central power source due to the pulsating load the phases of the current pulse signals are shifted relative to each other.
摘要:
A method of transmitting data packets in a message-switched channel (signalling channel) of a time-division multiplex system with CSMA-CD. Interference-free transmission in the message-switched channel ensures the absence of collisions on occupying the circuit-switched connection. Message mutilation and collision on accessing the message-switched channel are remedied by a retransmission procedure in which the unique station address number determines the frame number in which the retransmission may start. This procedure guarantees that a station accesses the message-switched channel within a very short period of time. This guaranteed access is not possible with the prior art CSMA-CD buses.