Patent ID: 6850881
Filing Date: 2005-02-01
Classification: H04L,H04Q

Abstract:
1. A device for Connection Admission Control for an ATM switch, intended for admitting to the switch a requested ATM connection of the DBR type, such that the “Quality of service” of all ATM connections of the DBR type in said switch continues to satisfy certain conditions, in which a single buffer with capacity B is available for the composite traffic stream of DBR connections at an output port with capacity C, while as a boundary condition it holds that a total average load of the output port does not amount to more than ρ×C, where ρ is a constant with a value between 0 and 1, wherein the device comprises two first and second sub-devices which each emit a positive or negative admission signal, admission to the switch only being granted to the new ATM connection if both sub-devices issue a positive admission signal, wherein said first sub-device comprises: a first arithmetic unit which calculates a sum (ΣPCR) of nominal traffic parameters Peak cell Rate (PCR a second arithmetic unit which compares the calculated sum (ΣPCR) with the value of ρ×C, the result of the first sub-device being negative if ΣPCR is greater than ρ×C, and the result of the first sub-device being positive if ΣPCR is less than or equal to ρ×C; and wherein said second sub-device comprises: for each of the ATM connections of the DBR type at the related output port, including the newly requested connection, a third arithmetic unit, which calculates a buffer capacity b a fourth arithmetic unit which calculates a sum (B a fifth arithmetic unit which calculates a buffer capacity B a sixth arithmetic unit which calculates a product (B a seventh arithmetic unit which determines a sum (B a comparison device which compares the calculated sum B