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Enabling true client Automatic Protection Switching (APS) protection of Time Division Multiplexing (TDM) traffic over circuit emulated (packet) networks

IP.com Disclosure Number: IPCOM000255297D
Publication Date: 2018-Sep-14
Document File: 5 page(s) / 314K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to enabling true client Automatic Protection Switching (APS) protection of Time Division Multiplexing (TDM) traffic over circuit emulated (packet) networks. Specifically, this disclosure addresses the problem of client protected Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy (SDH) traffic that is carried over circuit emulation pseudowires. Without this disclosure, client protection is limited to fiber cuts. The present disclosure includes aspects such as Switch on Signal Degrade (SD), Manual Protection Switches, Wait to Restore (WTR), etc. The solution proposed herein is to encode the APS Bytes of both the work and the protect TDM lines in the transport Ethernet network.

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Enabling true client Automatic Protection Switching (APS) protection of Time Division Multiplexing (TDM) traffic over circuit emulated (packet) networks

ABSTRACT

The present disclosure relates to enabling true client Automatic Protection Switching (APS) protection of Time Division Multiplexing (TDM) traffic over circuit emulated (packet) networks.

Specifically, this disclosure addresses the problem of client protected Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy (SDH) traffic that is carried over circuit emulation pseudowires. Without this disclosure, client protection is limited to fiber cuts.  The present disclosure includes aspects such as Switch on Signal Degrade (SD), Manual Protection Switches, Wait to Restore (WTR), etc.  The solution proposed herein is to encode the APS Bytes of both the work and the protect TDM lines in the transport Ethernet network.

DETAILED DESCRIPTION

The present disclosure relates to enabling true client Automatic Protection Switching (APS) protection of Time Division Multiplexing (TDM) traffic over circuit emulated (packet) networks.

Specifically, this disclosure addresses the problem of client protected Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy (SDH) traffic that is carried over circuit emulation pseudowires. Without this disclosure, client protection is limited to fiber cuts.  The present disclosure includes aspects such as Switch on Signal Degrade (SD), Manual Protection Switches, Wait to Restore (WTR), etc.  The solution proposed herein is to encode the APS Bytes of both the work and the protect TDM lines in the transport Ethernet network.

With Ethernet services providing better Operations, Administration, and Maintenance (OAM) capabilities and latency, the gap between the traditional TDM and Packet-based networks in narrowing.  This is driving service providers towards packet-based networks.  However, having to move the traditional customers to newer technologies requires support for legacy services.  To overcome this hurdle, Circuit Emulation Services have been conceptualized that make it possible for service providers to replace their SONET-based access networks to Multiprotocol Label Switching (MPLS) or Carrier Ethernet (CE) without giving up on their traditional customers.  Of note, the Customer is unaware of the technology used to carry traffic over the network.  Their perspective is a direct connection from end-to-end.

Essentially, what this leads to is SONET traffic handed over to service providers which then packetize the frames for transmission over MPLS or CE networks, i.e., Circuit Emulation.  There are many instances wherein the customer has opted for client protection to protect against client equipment failures.  The topology is depicted as follows:

The client protection is provided by a protocol such as APS (Automatic Protection Switching).  APS is a line protection protocol that provides for 1+1/1:N/M:N line protection.  This protoco...