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TDM Access & TDM Backhaul PPC Forum

June 12th 2008

Ian BoothmanSpyros Christou

Please note

The information contained within these slides is indicative and provided for information purposes only. The information represents no commitment from BT.

All features discussed in these slides are subject to detailed design & successful testing.

Progress to date

• Openreach has held a number of bilaterals, nine sessions with six CPs

• Bilaterals have been run to capture/re-affirm CPs requirements and indicative volumes, where possible

• Infrastructure pre-design has been undertaken by BT Design

• A consolidated feedback document was shared with those who had taken part in bilaterals on 15th May and published on the Openreach website on 20th May 2008.

• Openreach is currently focusing development on a 2Mb TDM Access product

• Workshop held 29th May to discuss requirements.

TDM Access and Backhaul Product Requirements Feedback from Customer Bilaterals

Access 2Mbs, 34Mbs and 155Mbs

Copper, fibre and radio access options

Aggregated hand-off options (IBH and ISH)

• Shared or dedicated CP mux

• VC12/3/4 switching granularity

Unprotected, RO1, RO2 and RO2 (different exchange)

resilience

Future-proof and upgradeable

• Share TDM and Ethernet on the same infrastructure

TDM Access and Backhaul Product Requirements Feedback from Customer Bilaterals

Backhaul STM-4 and STM-16 (STM-64)

IBH / ISH / ISHe handover

Converged backhaul (Ethernet & TDM traffic mix)

Definitions

CP = Communications Provider

Mux = TDM multiplexer

XL: Low-Order (VC-12) TDM cross-connect

XH: High-Order (VC-4) TDM cross-connect

High-order aggregation: Reorganisation of traffic / mapping of circuits within several STM-n bearers into a single STM-m bearer using XH functionality (m ≥ n)

Low-order aggregation: Reorganisation of traffic / mapping of circuits on partially-filled STM-n bearers into a single, more heavily-loaded STM-m bearer, using XL functionality (m ≥ n)

Grooming: Any-to-any mapping of 2Mb/s circuits between multiple STM-n bearers, using XL functionality

Customer site

2Mb/s access service - Variant A

BT serving site

Access

• Access between customer site and BT serving site.• For simple point-to-point service only. • No aggregation or grooming.• Likely application: where n is low, e.g. 1 to 16.

n x 2Mb/sFibre / Copper

Mux

n x 2Mb/s

CP1

CP node

Mux

• Access between one or more customer sites and BT serving site.• Provides a low-order aggregation service.• Option: grooming may also be provided as shown in lower example.• Likely application: where BT serving site is parent for several customers from the same Communications Provider (CP1 shown here).

Offered either as:• n x 2Mb/s, or• channelised STM-1

CP1

CP1

CP1

2Mb/s access service - Variant B

Access

Customer site BT serving site

Fibre / Copper

Multiple STM-1/4handoff

CP node

XL

n x 2Mb/s

Mux

CP1

CP1

CP1

Fibre / Copper

Single STM-1/4/16

handoff

XL

n x 2Mb/s

Mux

TDM Access and Backhaul Product Requirements Feedback from Customer Bilaterals

Performance

Components must allow CPs to replicate the existing E2E

customer experience

• Network - availability, delay, jitter etc.

• Service – SLA / SLG, TotalCare

TDM Access and Backhaul Product Requirements Feedback from Customer Bilaterals

Migration

Quick, easy and low cost – smooth customer journey

• Little evidence of new demand

• Avoid Excess Construction Charges

Defined migration paths from / to PPC, RBS, NS16 and

Ethernet in the future

Managed bulk migration option

Openreach is developing a new TDM Access product on a new provide basis. It has no plan to develop a migration path.

Indicative Timeline – 2Mb box to box access solution

Not to scale

Subject to internal Openreach agreement and sign off

Bilaterals complete

Q1

Customer definition workshop

Share initial product requirement document

Define 2Mb product offering

Agree and finalise initial product requirement document

Start feasibility

Share feasibility results, gather feedback

Implement feasibility feedback and start solution design

Understand commercials with customers

Go/No Go on commercial grounds

Q2 Q3 Q4

Complete solution design

2008/09

Indicative Timeline – 2Mb box to box access solution

Systems and infrastructure development(EMP platform etc)

Update customers, gain feedback, engage trialists etc

Testing/ trial

LaunchShare progress with industry

Q1 Q2 Q3

COMPLETESystems and infrastructure development(EMP platform etc)

Q4

Share progress with industry

2009/10

Not to scale

Subject to internal Openreach agreement and sign off

Next Steps for 2 Mb Access

Openreach

Create PRD

Commercial Analysis

Product Development

Communications Providers

Provide target price and robust volumes to Openreach

AOB

n x STM-1 Fibre, STM- 4/16 n x STM-1

• Interconnect service between BT serving site and CP node.• CSH (Customer-Sited Handover).• Provides a simple CP interconnect service.• Provides neither aggregation or grooming.• Likely application: Where n is low, e.g. 1 to 16.• Need to consider resilience options.

BT serving site

Mux Mux

CP nodeCustomer site

Access

155Mb/s access service

BT serving site

155Mbps backhaul service

BT serving site

Backhaul

• This variant provides a simple service i.e. no aggregation• The service is relevant to new build only i.e. not by CPs migrating from PPCs• It is likely to apply in cases where n is low e.g. 1 to 16• The service will run over shared infrastructure, owned & managed by BT Operate• Re-use of Orchid solution would require product upgrade to include TDM interfaces• Second diagram illustrates why this service is required:

• Required by CPs with a presence at a serving site• But where the CP does not own network connectivity to that site

n x STM-1/4/16Fibre / WDM /

STM-16 / Orchid

XHXH

n x STM-1/4/16CP1

Customer site BT serving site

Access

STM-1/4/16 Fibre / WDM /STM-16 / Orchid

XHXH

n x STM-1/4/16

BT serving site

Backhaul

CP1

n x 2MbpsFibre / Copper

XLXH