| 摘要 |
The present invention relates to a method and arrangement to control an established wideband connection through a switching unit regarding frame integrity of the time slots. The invention is suitable to be used in a switching unit of TST-structure. A first counter, related to respective input selector stage, counts incoming data frames. This first counter cycles through a predetermined number of states, where one state is a control-state. Each time slot belonging to the wideband connection to be tested is given a control mark during one of the control-states. A second counter, related to respective output selector stage, counts outgoing data frames. The second counter cycles through the same number of states as the first counter. Marked time slots are detectable by respective output selector stage. The state of the second counter and the output channel number of the control marked time slot is stored as a marked time slot is detected. The wideband connection to be tested is regarded correctly established through the switching unit if the time slots belonging to the wideband connection are all detected during a mutually same state of the second counter. |
