Telefonaktiebolaget Lm Ericsson (publ)

Fredrik Olsson

Ulf Peter Hansson

Mikeal Lindberg

The invention relates to a method and device for switching user data, belonging to a connection, between different time slots in a switch or a switch stage such that sequence and frame integrity are preserved. According to the invention, an efficient algorithm is utilized for determining distribution information, in form of storage positions in one or more control memories in the switch. User data is caused to be switched, according to this distribution information from the algorithm, such that these user data maintain the same reciprocal time order through the switch or switch stage. The distribution information determined by the algorithm assures sequence integrity and at the same time minimizes the delay of user data through the switch and/or switch stage. The algorithm also generates control information in form of delay values for delaying some user data such that data belonging to incoming time slots in one and the same frame are assigned to outgoing time slots in the same frame.

Establishing telecommunication connections

Sequence integrity and frame integrity are preserved in switching wideband connections through a switch or a switch stage. The speech memory in a switch stage in the switch is extended to include storage positions that in number correspond to the number of time slots in two frames. These storage positions are arranged into two parts of the same size in the speech memory. Furthermore, there is provided a delay control unit in the time switch stage for generating delay information based on control information in the control memory of the switch stage and a determined part of the counter information from a time slot counter circuit. This delay information controls, for each time slot, to/from (depending on if the speech memory is arranged in an outgoing stage or an incoming stage) which one of the first and second parts of the speech memory that user data is switched.

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Trångsund, Sweden

Fredrik Olsson