Geneva, 27 May 2010 Types and Characteristics of Packet Transport Network (PTN) Equipment (Draft...

Geneva, 27 May 2010

Types and Characteristics of Packet Transport Network (PTN) Equipment (Draft Recommendation - G.ptneq)

Jia He and Hilmar Hofmann G.ptneq editors

Introduction

Since 2002, the ITU-T has been developing recommendations for packet transport network architecture, equipment, OAM, NNI, protection and management with specific emphasis on technology such as Ethernet and MPLS The Ethernet recommendations have been developed in a close cooperation with IEEE 802.1 These recommendations use functional decomposition/ components to describe packet transport networks Missing today is a recommendation which provides guidance on how to combine these functional components in equipment and networks This gap has been identified and a new recommendation G.ptneq is a work in progress

Geneva, 27 May 2010 2


G.ptneq: Rationale

The objective is to describe PTN equipment functionality independent of existing and future packet based technologies (ie. generic part)A second part is to describe technology specific equipment functionality such as Ethernet or MPLS-TP.Enable any PTN equipment to use common features:

management planecontrol planesurvivability schemesOAM behaviour

PTN equipment built for different packet technologies shall have common characteristics


G.ptneq: Background

ITU-T develops generic description of functional reference models for transport network equipment which are used in a Packet Transport Network to efficiently provide packet based services.The objective is:

To provide a variety of equipment type examples (VC Term, VC Switch, VP Switch, etc.) To describe the equipment using atomic functionsTo avoid constraints on the implementation

PTN equipment types are described interms of functional blocks


G.ptneq: Timetable

Consent a recommendation by June 2010 which contains the basic concept and generic/technology agnostic information.Consent a second version in Feb 2011 which contains additional technology specific functionality (e.g. Ethernet, MPLS-TP).


G.ptneq: Scope

This recommendation describes an overview of the functions of packet transport network (PTN) equipment and provides examples of various PTN equipment types. It is by no means restricting the way equipment may be built.

G.ptneq does not mandate the way equipment should be built.


G.ptneq: Content

Current draft version contains basic concept and generic/technology agnostic aspects.

PTN Layer HierarchyFunctions to be supported on PTN equipment

Multiplexing/DemultiplexingOAM and provisioning/managementProtection switchingTiming and Synchronization

PTN Interface portsPTN Equipment types


G.ptneq: PTN Domain Model

VC Term:demarcation between Client and carrier (PTN)Generation/Termination of VC layer

VC Switch:Switch function on VC layerGeneration/Termination of VP layer

VP SwitchSwitch function on VP layer

VC Term

VC Term

VC Term

VC Term

VC Term

VP Switch

VP Switch

VC Switch

VC Switch

VC Switch

VC Switch

access

metro

core

Carrier A

UNI

UNI

UNI

UNIUNIWholesale

Access Point

Carrier B

IrDIIaDIIaDIIaDIIaDI

IaDI

IaDI

IaDIIaDI


G.ptneq: PTN Layer Hierarchy

PTN provides up to 3 packet based layers

Virtual Channel LayerVirtual Path LayerVirtual Section Layer (as part of the transmission media layer)

Client/Server Mode:customer’s signal is treated as a client layer signal of the PTN VC layer and is encapsulated into the PTN VC signal

Customer/Client service Layer

Virtual Channel Layer

Virtual Path Layer (optional)

Virtual Section Layer (optional)

Physical Media (802.3)

GFPCircuit Switching Technology

(OTN, SDH, PDH)

Physical Media (OTM-n, STM-n, DSn/En,

xDSL)

PT

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G.ptneq: PTN Layer Hierarchy

Peering Modecustomer’s signal is passed through the PTN VC layer without encapsulation only a subset of clients that must be of the same technology as PTN VC can be supported

Customer/Client service Layer

Virtual Channel Layer

Virtual Path Layer (optional)

Virtual Section Layer (optional)

Physical Media (802.3)

GFPCircuit Switching Technology

(OTN, SDH, PDH)

Physical Media (OTM-n, STM-n, DSn/En,

xDSL)

PT

N la

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netw

orks

Tra

nsm

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G.ptneq: PTN Layer Hierarchy for multiple domains

In multi-domain case the layer relationship is relative.

VP in Domain 1 is VC in Domain 2VS in Domain 1 is VP in Domain 2 VP in Domain 2 is VC in Domain 3VS in Domain 2 is VP in Domain 3

11Geneva, 27 May 2010

VC

VP

VS

VC

VP

VS

VC

VP

VS

Domain 1 Domain 2 Domain 3

Next Step

PTN VC/VP/VS layers may be supported by the Ethernet technology including ETH OAM(Y.1731,G.8021), ETH protection switching(G.8031,G.8032), ETH connection management (G.8051, G.8052).The use of Ethernet technology in PTN requires an extension of the tagging option defined in 802.1Q to support VC, VP, VS stacking in single and multi-domain scenarios. ITU-T Q9/15 would like to progress this work in cooperation with IEEE 802.1

12Geneva, 27 May 2010

Thanks You

Any Q?

Backup Slides


G.ptneq: Generic overview of PTN functional Model

VC/A

VC

PM

Sn/AVP

AVP

VP/AV

AVC

AVP

AVC

AVP

VC/A

VC

AVP

AVC

Eq

Eq/Pqx VC/P

qx

ETY

ETY/ETH VC/E

TH

ETH AVP

ETH AVP

VC VC

VCVC VP VP VS PM

PM/V

S

VC

VS/V

P-m

VS PM

PM/V

S

VS/V

P-m

VP/V

C-mVC

VP

VSPM

PM/VS

VS/VP-m

VC

VSPM

PM/VS

VS/VC-m

VSPM

PM/VS

VS/VP-m

VC

VP/VC-m

VP

VP

VP

VC

VC

MP

MP

MPMP

MP

MP MP

MP

MP

MP

MP

MP MP

MPMP

MPMP

MP

MP

MP

MP

MP

MP

MP

MP MP

MP

MP

MP MPMP

MPMPMP

MP

MP

MP

MP

MP MP

MP

MP MP

MP

MPMP

MP

MP

TP

TP

TP

TP

TP

TP

TP

TP

MCCS

MCCS

MPMCCS MCCP

MP

EMF MCF

Timing

MCCS

QFMPs

TPs

MCCP

MCCS


G.ptneq: Port Model Examples

PTN VC

PTN VC MIP

mp PTN VC VC TC

PTN VC TCMps MEP

mp PTN VC TCM/c MEP

PTN VS NCM MEP

IaDI Type 1

PTN VC

PTN VC MIP

mp PTN VC TC

PTN VC TCMps MEP

mp PTN VC TCM/c MEP

PTN VS NCM MEP

IaDI Type 2

PTN VP NCM MEP

PTN VC

PTN VC MIP

mp PTN VC TC

PTN VC TCMps MEP

mp PTN VC TCM/c MEP

PTN VS NCM MEP

IrDI Type 1

PTN VC TCMnoMEP

PTN VC

PTN VC MIP

mp PTN VC TC

PTN VC TCMps MEP

mp PTN VC TCM/c MEP

PTN VS NCM MEP

IrDI Type 2

PTN VP NCM MEP

PTN VC TCMnoMEP


G.ptneq: Port Model Examples (contd.)

Client

PTN VC

Client specific processing

Client MIP Client MIP

Client TC

PTN VC NCMsp MEP

PTN VC TCMno MEP

UNI-N Service model 1 PTN VC

ETH VC

PTN VC UNI processing

PTN VC MIP PTN VC MIP

PTN VC TC

PTN VC TCMsp MEP

PTN VC TCMno MEP

UNI-N Service model 2

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