| 摘要 |
<p>The invention provides a method for transmitting, via a transmission medium with a plurality of virtual, asynchronously time-divided transmission channels, a flow of data, and in particular a method for protecting these transmission channels against an exceeding of the maximum cell frequencies, based on the "leaky bucket"-entrance monitoring method. According to the invention the state of the counter of the relevant channel will be decreased on the arrival of a data cell by a value which is a function of the length of time between the moment of arrival of that data cell and the moment of arrival of a preceding data cell with the same channel indication. The decrease of the state of the counter takes place under the same time regime as the arrival of the data cells. Also the increase of the state of the counter, the comparison of that state of the counter with a threshold value and the switching through or not, dependent on the result of the comparison, of the data cell takes place under the same time regime. Owing to this, the monitoring device can function synchronously with the successively arriving data cells in a completely time-divided way, due to which all the virtual channels can be monitored individually by means of only one such a monitoring device. The value by which the state of the counter is decreased on the arrival of the data cell is preferably the product of a first constant value and said length of time between said two moments of arrival. The invention also comprises a device for carrying out said method and is for that purpose provided with read-out means (1), storage means (3, 5, 7, 9, 12, 14), time indicating means (4), computing means (6, 8, 10, 11, 15), means of comparison (13) and switching means (2).</p> |
