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Multi-chassis 1+1 MSP protection for TDM over packet services

IP.com Disclosure Number: IPCOM000255730D
Publication Date: 2018-Oct-11
Document File: 7 page(s) / 429K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to multi-chassis 1+1 Multiplex Section Protection (MSP) protection for Time Division Multiplexing (TDM) over packet services. The present disclosure provides resilient multi-chassis 1+1 MSP protection for TDM over Packet (TDMoP) services over packet devices to protect against chassis faults. Multi-chassis devices form a Redundant Group (RG) and use an Automatic Protection Switching (APS) chassis link (ACL) to facilitate the exchange of K1/K2 status messages required to keep APS state machines synchronized between packet devices and to block/unblock the TDM traffic in packet network accordingly.

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Multi-chassis 1+1 MSP protection for TDM over packet services

ABSTRACT

The present disclosure relates to multi-chassis 1+1 Multiplex Section Protection (MSP) protection for Time Division Multiplexing (TDM) over packet services.  The present disclosure provides resilient multi-chassis 1+1 MSP protection for TDM over Packet (TDMoP) services over packet devices to protect against chassis faults.  Multi-chassis devices form a Redundant Group (RG) and use an Automatic Protection Switching (APS) chassis link (ACL) to facilitate the exchange of K1/K2 status messages required to keep APS state machines synchronized between packet devices and to block/unblock the TDM traffic in packet network accordingly.

DETAILED DESCRIPTION

The present disclosure relates to multi-chassis 1+1 Multiplex Section Protection (MSP) protection for Time Division Multiplexing (TDM) over packet services.  The present disclosure provides resilient multi-chassis 1+1 MSP protection for TDM over Packet (TDMoP) services over packet devices to protect against chassis faults.  Multi-chassis devices form a Redundant Group (RG) and use an Automatic Protection Switching (APS) chassis link (ACL) to facilitate the exchange of K1/K2 status messages required to keep APS state machines synchronized between packet devices and to block/unblock the TDM traffic in packet network accordingly.

Problem Description:

TDM services such as T1/E1, T3/E3, and SONET/SDH are widely deployed in Mobile backhaul (MBH) using TDM-over-packet (TDMoP) techniques.  A number of service providers are moving towards the TDM over packet switched network solutions.  Protection plays an important role for TDM services as they carry high priority services.

Currently, TDMoP services at the hand-off between TDM network and packet network can be protected via a linear protection scheme, i.e., 1+1 MSP which allows TDM services to protect against line or port faults where the source and destination device are common to both work and protect paths as shown in FIG. 1.

FIG. 1

Currently, packet devices do not provide any resilient multi-chassis mechanism to protect the TDMoP services from chassis faults like chassis reboot/upgrade/replacement.  As shown in FIG. 2, suppose a TDM service from service provider-1 is passing through a packet switched network (service provider-2) and service provider 2’s edge network device reboots then TDM service will be impacted.

FIG. 2

Solution to the above-described problem:

The present disclosure provides resilient multi-chassis 1+1 MSP protection for TDMoP services over packet devices to protect against chassis faults as shown in FIG. 3.  Multi-chassis devices will form a Redundant Group (RG) and will use Automatic Protection Switching (APS) chassis link (ACL) to facilitate the exchange of K1/K2 status messages required to keep APS state machine in sync between packet devices and to block/unblock the TDM traffic in packet network accordingly.

Any APS bytes status change shall be updat...