Telefonaktiebolaget Lm Ericsson (publ)

Mats L Lindblom

Hans A Berghager

Per E Sydhoff

Hao Jiang

Karl S Buhrgard

Mikael Kundel

Johan U Tingsborg

Astrid Berglund

A change of switch plane operation is performed in a multi-plane cell switching node () which has a first switch plane (); a second switch plane (); and plural switch port interface units (). In response to detection of a fault in the active switch plane, the passive switch plane sends a plane change cell to the plural switch port interface units, and stops egress traffic flow from the second switch plane. Upon receiving the plane change cell, each switch port interface unit redirects traffic cells sent from the active plane to the passive switch plane. Each switch port interface unit then determines when traffic cells destined thereto have been flushed from the first switch plane, and changes its active switch plane designation (so that the formerly passive switch plane becomes the active switch plane) so that egress traffic flow can begin from the formerly passive (now active) plane to the respective switch port interface units.

Synchronous change of switchplane

A cell switch node () has a first switch plane (); a second switch plane (); a sender switch port interface unit (); and a receiver switch port interface unit (). The sender switch port interface unit sends maintenance cells to the receiver switch port interface unit via the first switch plane and the second switch plane. The maintenance cells are applied to the first switch plane and the second switch plane in a predetermined sequence. The receiver switch port interface unit detects an erroneous switch plane when the maintenance cells from the sender switch port interface unit do not arrive in the predetermined sequence.

Fault detection in multi-plane switch

A signal receiving and a signal transmitting unit converts an information carrying signal received at a first transmission rate to an information carrying signal transmitted at a second transmission rate that differs from the first transmission rate. Several inputs and outputs are available, each input structured for a transmission rate that is different from the transmission rates of remaining inputs, and each output structured for a transmission rate that is different from the transmission rates of remaining outputs. One signal receiving input can be connected to one signal transmitting output depending on signals occurring on one or more control conductors, wherein a selected control conductor and/or selected signal information selects and initiates a conversion mode having a selected conversion index.

Signal receiving and transmitting unit for converting a transmission

Growing community of inventors

Johanneshov, Sweden

Mats L Lindblom