Transmission system with recording of untransmitted packets
First Claim
1. Transmission system for transmitting packets which comprise an information word group and a control word group, the control word group comprising an identification of the packet type by an identification information regarding the virtual transmission channel via which the packet is being transmitted, which transmission system comprises access control means for granting or refusing said packets access to the part of the transmission system situated downstream of the access control means, depending on the rate of arrival of incoming packets, characterized by an error reporting device (4) for recording, processing and reporting the rate of arrival per packet type (vci) of those packets which are refused access to said downstream situated part by the access control means (2, 3), said error reporting device having inputs from a plurality of said virtual channels via a read-out and set device (1) and from said access control means (2, 3) and having outputs for providing an error message for further processing thereof or to supply said message to means (5) for converting it into intelligible visible form.
3 Assignments
0 Petitions
Accused Products
Abstract
Packets transmitted in an automatic packet transmission system each have an information part and a header part. The heater contains virtual channel information (vci), identifying the virtual transmission channel and/or the group of virtual transmission channels via which the packet is being transmitted. The transmitted system at a junction point comprises 94 access control system including a counter-and-threshold access control device (3) controlling a switch (2) for granting or refusing packets access to the downstream part of the transmission system, depending on the arrival rate of incoming of packets of the respective packet types identified by their virtual channel information. An error reporting device (4) records per vci the arrival rate of packets which are refused access downstream when a first threshold arrival rate is exceeded. Arrival rates and arrival rate thresholds are measured by a "leaky bucket" method for each packet type. When the arrival rate of packets which are refused downstream access exceeds a second threshold value the error reporting device prevents excessive processing of access refusals in overloaded virtual channels and sends an error message for attracting the attention of supervisors or users of the transmission system.
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Citations
9 Claims
- 1. Transmission system for transmitting packets which comprise an information word group and a control word group, the control word group comprising an identification of the packet type by an identification information regarding the virtual transmission channel via which the packet is being transmitted, which transmission system comprises access control means for granting or refusing said packets access to the part of the transmission system situated downstream of the access control means, depending on the rate of arrival of incoming packets, characterized by an error reporting device (4) for recording, processing and reporting the rate of arrival per packet type (vci) of those packets which are refused access to said downstream situated part by the access control means (2, 3), said error reporting device having inputs from a plurality of said virtual channels via a read-out and set device (1) and from said access control means (2, 3) and having outputs for providing an error message for further processing thereof or to supply said message to means (5) for converting it into intelligible visible form.
Specification