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Types and Characteristics of Packet Transport Network (PTN) Equipment (Draft Recommendation - G.ptneq). Jia He and Hilmar Hofmann G.ptneq editors. Introduction.

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types and characteristics of packet transport network ptn equipment draft recommendation g ptneq

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

Jia He and Hilmar Hofmann

G.ptneq editors

introduction
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

2

Geneva, 27 May 2010

g ptneq rationale
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 plane
    • control plane
    • survivability schemes
    • OAM behaviour

PTN equipment built for different packet technologies

shall have common characteristics

g ptneq background
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 functions

To avoid constraints on the implementation

PTN equipment types are described in

terms of functional blocks

4

Geneva, 27 May 2010

g ptneq timetable
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).

5

Geneva, 27 May 2010

g ptneq scope
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 notmandate the way

equipment should be built.

6

Geneva, 27 May 2010

g ptneq content
G.ptneq: Content

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

PTN Layer Hierarchy

Functions to be supported on PTN equipment

Multiplexing/Demultiplexing

OAM and provisioning/management

Protection switching

Timing and Synchronization

PTN Interface ports

PTN Equipment types

7

Geneva, 27 May 2010

g ptneq ptn domain model
G.ptneq: PTN Domain Model

VC Term:

demarcation between Client and carrier (PTN)

Generation/Termination of VC layer

VC Switch:

Switch function on VC layer

Generation/Termination of VP layer

VP Switch

Switch function on VP layer

8

Geneva, 27 May 2010

g ptneq ptn layer hierarchy
G.ptneq: PTN Layer Hierarchy

PTN provides up to 3 packet based layers

Virtual Channel Layer

Virtual Path Layer

Virtual 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

9

Geneva, 27 May 2010

g ptneq ptn layer hierarchy10
G.ptneq: PTN Layer Hierarchy

Peering Mode

customer’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

10

Geneva, 27 May 2010

g ptneq ptn layer hierarchy for multiple domains
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 2
    • VS in Domain 1 is VP in Domain 2
    • VP in Domain 2 is VC in Domain 3
    • VS in Domain 2 is VP in Domain 3

Domain 1

Domain 2

Domain 3

VC

VP

VC

VS

VP

VC

VS

VP

VS

11

Geneva, 27 May 2010

next step
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

12

Geneva, 27 May 2010

slide13

Thanks You

Any Q?

g ptneq port model examples
G.ptneq: Port Model Examples

16

Geneva, 27 May 2010