Detection of a low level marshalling sequence

Details Detection of a low level marshalling sequence Detection of a low level marshalling sequence

H - Electricity

04

B

H04B 7/212 (2006.01) H04J 3/06 (2006.01) H04L 7/06 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2192100

In a TDMA communications system comprising a base station and a number of outstations, a marshalling signal enables a newly connected outstation to determine the timing of its transmission bursts. A detector circuit for recovering the marshalling signal incorporates comparators (21, 41) whose thresholds are adjusted to the high and low levels of the normal data signal. The marshalling signal is recovered from one or other of the comparators (21, 41) according to whether a high or low normal data signal is received, this condition being determined by a third comparator (31) whose threshold is adjusted midway between the high and low level. This allows the marshalling signal to be recovered continuously without interrupting normal data transmission from the outstation.

Dans un système de communications ARMT comprenant une station de base et un certain nombre de stations extérieures, un signal de mise en ordre permet à une station extérieure récemment raccordée de déterminer la synchronisation de ses salves de transmission. Un circuit détectant le signal de mise en ordre comprend des comparateurs (21, 41) dont les seuils sont réglés pour les niveaux haut et faible du signal normal de données. Le signal de mise en ordre est repris de l'un ou l'autre des comparateurs (21, 41) suivant que le niveau de réception du signal normal de données est haut ou faible, ces conditions étant déterminées par un troisième comparateur (31) dont le seuil est à mi-chemin entre le niveau haut et le niveau faible. Ceci permet, depuis la station extérieure, de recevoir en continu le signal de mise en ordre, sans interrompre la transmission normale des données.

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