| 摘要 |
The invention relates to a method for receiving a signal used in a synchronous digital telecommunication system. The method comprises pointer interpretation in which the receiver has three possible main states, between which it undergoes transitions under the control of event counters, the main states being a normal state (NORM), a loss of pointer state (LOP) and an alarm state (AIS), said counters counting predetermined events in each main state, said events comprising the reception of alarm data indicating an alarm (AIS-ind), the reception of a new data flag indicating a new pointer value (NDF-enable), the reception of the active pointer (active-point), and the reception of an invalid pointer (inv-point). In order for the fault tolerance of the system to be improved, all the pointers which do not indicate an alarm, a new data flag or the active pointer are considered invalid in the normal state (NORM). |
