Method of synchronization between data communication devices permitting peer-peer and master-slave communications
AssigneeDatos Corporation
InventorsJames E. Westbrook, Adolfo B. Juarez
Life of this patent
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Abstract
In a telecommunication switching system, a communication link between distant devices is allocated in a quasi-TDMA (time division multiple access) manner between two distant devices. Messages are conformed to a data format which allows the switching center to determine in which direction data is to be transmitted, within at most a few bit transmission times. Both half-duplex and full-duplex communication links are possible.
Claims10
A device for synchronizing communication between a pair of data communication devices, comprising in each said data communication
- detection means for detecting a reception arrival time from the other data communication device;
- comparator means for comparing said reception arrival time with a predetermined frame window;
- signalling means for generating an adjustment signal in either said data communication device when said reception arrival time fails to fall within a predetermined range of said predetermined frame window;
- and
- delay register means, responsive to said adjustment signal from the other said data communication device, for adjusting a transmission start time.
In a telecommunications switching system, a method of synchronization between a first data communication device and a second data communication device, comprising each said data communication device performing the steps of
- detecting a reception arrival time from the other said data communication device;
- comparing said reception arrival time with a predetermined frame window start time;
- generating an adjustment signal when said reception arrival time fails to fall within a predetermined range of said predetermined frame window start times;
- and
- responding to said adjustment signal from the other said data communication device by adjusting said time of transmission start to fall within said predetermined range of predetermined frame window start times.
A device for synchronizing communication between a pair of data communication devices, said data communication devices communicating in a time-division multiplexed manner in a periodic frame window, comprising in each said data communication device
- means for detecting a phase delay between start of said periodic frame window and start of a message received from said other data communication device;
- means for comparing said phase delay with a predetermined value;
- means for generating an adjustment signal in said other data communication device when said phase delay exceeds said predetermined value;
- and
- means, responsive to said adjustment signal from said other data communication device, for adjusting a phase delay between start of said periodic frame window and start of a message transmitted to said other data communication device.
In a telecommunications switching system, a method of synchronization between a pair of data communication devices, said data communication devices communicating in a time-division multiplexed manner in a periodic frame window, comprising each said data communication device performing the steps of
- detecting a phase delay between start of said periodic frame window and start of a message received from said other data communication device;
- comparing said phase delay with a predetermined value;
- generating an adjustment signal in said other data communication device when said phase delay exceeds said predetermined value;
- and
- responding to said adjustment signal from said other said data communication device by adjusting a phase delay between start of said periodic frame window and start of a message transmitted to said other data communication device.
Dependencies are inferred from the claim text.