Patent ID: 6215773
Filing Date: 2001-04-10
Classification: H04L,H04Q

Abstract:
A method to control an established wideband connection through a switching unit, the switching unit comprising at least one input selector stage and at least one output selector stage, where the information coming into an input selector stage is represented by digital databits, arranged into incoming time slots within data frames, where an incoming time slot corresponds to an incoming channel with a specific channel number, and where outgoing information from an output selector stage is represented by digital databits, arranged into outgoing time slots within data frames, where an outgoing time slot corresponds to an outgoing channel with a specific channel number, and where said wideband connection holds two or more time slots within one data frame, the method comprising the steps of:counting said incoming data frames by a first counter related to said input selector stage;cycling said first counter through a predetermined number of states, of which one state constitutes a control state;labeling each time slot belonging to said wideband connection during one of said control states;counting said outgoing data frames by a second counter, related to said output selector stage;cycling said second counter through the same number of states as said first counter;detecting time slots that have been labeled by said output selector stage;storing the state of said second counter and the outgoing channel number of said labeled time slot as a labeled time slot is detected;wherein said wideband connection is regarded as correctly established through said switching unit if the labeled time slots belonging to said wideband connection are detected during the same state for said second counter, and if time slots belonging to other connections than said wideband connection are unlabeled during the control.