Method, processor and system of providing ATM unidirectional path switched ring functionality
AssigneeAlcatel Alsthom Compagnie Generale d'Electricite
InventorClaude M. Hurlocker
Life of this patent
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Abstract
ATM path switched ring switching is based on a ring segment BIP. An ATM VP ring segment is defined as originating at an ATM VP ring input and terminating at an ATM VP ring output. A ring segment BIP is composed of the path BIP error counts of multiple SONET/SDH paths from the ring segment input to the ring segment output.
Claims8
Selection method for selecting a path in an asynchronous transfer mode (ATM) switched ring, comprising the steps of:
- defining ring segments as different ring paths originating at a same ATM virtual path (VP) ring input and terminating at a same ATM VP ring output node wherein a ring segment includes all ring nodes from the ring input to the ring output node;
- determining a preferred ring segment according to a criterion that is independent of cell traffic rate;
- and
- group switching all virtual paths which transit this selected ring segment.
A processor for use in a network element (12, 14, 16, 18) in an asynchronous transfer mode (ATM) unidirectional path switched ring, comprising:
- a first direction ring segment bit interleaved parity (BIP) processor, responsive to an incoming ring segment operation and maintenance (OAM) cell having a segment BIP error count transported therein in said first direction, for providing said segment BIP error count to an adder for summation with a running average path BIP error count, said adder for providing an updated segment BIP error count for transport on an outgoing ring segment OAM cell in said first direction;
- and
- a second direction ring segment bit interleaved parity (BIP) processor, responsive to an incoming ring segment OAM cell having a segment BIP error count transported therein in said second direction, for providing said segment BIP error count to an adder for summation with a running average path BIP error count, said adder for providing an updated segment BIP error count for transport on an outgoing ring segment OAM cell in said second direction.
Selection method for selecting a path in an asynchronous transfer mode (ATM) unidirectional path switched ring, comprising the steps of:
- defining the ring segments as different ring paths originating at a same ATM virtual path (VP) ring input node and terminating at a same ATM VP ring output node wherein a ring segment includes all ring nodes from the ring input node to the ring output node;
- determining a preferred ring segment according to a selected criterion;
- and
- at said same ATM VP ring output, group switching all virtual paths which transit this selected ring segment.
Dependencies are inferred from the claim text.