H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) H04Q 3/00 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2261323
A method of improving the signalling performance reliability of an interface between a signalling agent and an ATM switch in a DSS2 asynchronous transfer mode network. In the case of a non-redundant signalling agent, a primary link is established between a first Layer 2 port of the signalling agent and a first Layer 2 port of the ATM switch; and, a primary backup link is established between a second Layer 2 port of the signalling agent and a second Layer 2 port of the ATM switch. The Layer 2 ports are coupled to Layer 3 segments of the signalling agent and the ATM switch respectively, in accordance with established ATM protocols. During normal operation of the primary link, the primary link is maintained in an active state in which all signalling messages directed to the interface are transferred between the Layer 3 segments over the primary link. The primary backup link is maintained in a standby state in which the primary backup link is active between the second set of Layer 2 ports, but inactive between the Layer 3 segments. Upon abnormal operation of the primary link, the primary link is switched into an inactive state to prevent further transfer over the primary link of signalling messages directed to the interface; and, the primary backup link is switched into an active state in which all signalling messages directed to the interface are transferred between the Layer 3 segments over the primary backup link.
Naidoo Nilanthren V.
Rakocevic Vladimir
Alcatel Canada Inc.
Newbridge Networks Corporation
Oyen Wiggs Green & Mutala Llp
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