초록 ▼

In a time division multi-access communications system each burst in each slot commences with a preamble and the clocks used to control the sequence of operations are synchronized by means of these preambles. In particular the outstations control their transmissions to the node by timing pre-set dela

In a time division multi-access communications system each burst in each slot commences with a preamble and the clocks used to control the sequence of operations are synchronized by means of these preambles. In particular the outstations control their transmissions to the node by timing pre-set delays from the receipt of the preamble. In a preferred embodiment the pre-set delays are adjusted by signals from the node so that bursts arrive at the node in correct sequence.

대표청구항 ▼

A communication system comprising a single node and a plurality of outstations arranged for communication using two communication channels, one of said communication channels being used for communicating signals from the node to all of the outstations, the other of said communication channels being

A communication system comprising a single node and a plurality of outstations arranged for communication using two communication channels, one of said communication channels being used for communicating signals from the node to all of the outstations, the other of said communication channels being shared by all of the outstations, wherein said communcation takes the form of traffic bursts within successive frame periods, each burst including a marker signal for synchronization wherein the node includes a plurality of burst extraction means for extracting respective selected bursts from received signal frames; wherein the outstations each include at least one burst extraction means for extracting respective selected bursts from received signal frame; and wherein each burst extraction means includes frame synchronization means responsive only to the marker signals within its respective bursts.