Telefonaktiebolaget Lm Ericsson (publ)

Clarence Jorn Fransson

Gunnar Larsson

Anders Bjenne

Raimo Kalevi Sissonen

Peter Carl Lundh

Mats Goran Wilhelmsson

Bengt Kvist

A method and a buffer structure ensure a fair share of the bandwidth between point-to-point and point-to-multipoint connections with the same or different priorities. For each priority class, the buffer structure includes one queue for each physical link of restoring point-to-point cells for each priority level and one queue for point-to-multipoint cells. When a cell is to be transmitted on a link, the point-to-point and point-to-multipoint cells for this link, if any, from the highest priority class in each case are identified. If the cells belong to the same priority class, the cell stored first is transmitted.

Method and device in telecommunications system

A phase-locked loop having very fast acquisition, and low output phase jitter and stability at steady-state is provided. In general, the phase-locked loop is used for synchronizing an output signal of said phase-locked loop with an input reference signal. The filter circuit of the phase-locked loop includes a differentiator responsive to the phase difference representing signal from a phase detector in the PLL for providing a differentiated signal, and a filter responsive to both the phase difference representing signal and the differentiated signal to provide a filter output signal. Preferably, the filter is a low-pass filter. The output signal source of the PLL is controlled by a control signal which is generally based on the filter output signal.

Phase locked loop

An Asynchronous Transfer Mode (ATM) switching device (20) has ATM cells (both point-to-point and point-to-multipoint) routed therethrough to one or more physical output links (31-38). The switching device (20) includes a cell buffer memory (92) which is the sole storage area on an egress exchange terminal for all cells, including point-to-multipoint cells, regardless of to which physical output link the cell is destined. For point-to-multipoint cells, pointers to the location of the cell in the cell buffer memory (92) are stored in one or more pointer queues (114), the pointer queues (114) corresponding to physical output links over which the point-to-multipoint cells are expected to be propagated. As each physical output link is selected, the pointer in the corresponding pointer queue is used to obtain the cell from the cell buffer memory (92) for readout on the selected link.

Buffering of point-to-point and/or point-to-multipoint ATM cells

Quality requirements on a counter may set a limit to the highest frequency that can be applied to the counter. This will also limit the resolution. A counter is provided including a generator for generating, in response to a first clock frequency, M second clock signals phase shifted with respect to each other and of a second frequency lower than the first frequency, and M secondary counters, each one responsive to a respective one of the M second clock signals for generating a secondary counter signal. The second frequency is adapted to work well in the technology available for realizing the secondary counters, with consideration taken to quality requirements. Furthermore, the counter included a summing circuit responsive to the secondary counter signals for generating the resulting counter signals by adding the secondary counter signals such that the counter signal has the same number of bits and the same significance as the secondary counter signals.

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Alvsjo, Sweden

Clarence Jorn Fransson