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21CN National Migration Plan of Record for PSTN and Broadband Services

Draft Issue: 2.0 (Provisional) Ref [C21-IM-003]

Date: 38842.04


This document is circulated for the purposes of consultation. As such, the contents are subject to change following such consultation.

This document is supplied to you in confidence as part of the Consult21 Process. It should not be circulated outside the Consult21 Communications Providers.

Copyright © British Telecommunications plc 2005


1 Introduction 3

1.1 Overview 3

1.2 Basis of Publishing the Provisional Plan of Record 3

1.3 Overview of Migration Schedule 4

1.4 Purpose of this Document 5

2 Ongoing Management 6

2.1 Sequencing and Timing 6

2.2 NMP Change Requests 6

2.3 Target NGS Capacity Check Process 7

2.4 Publication 8

2.5 Plan of Record Timetable 8

3 Glossary 9

Annex A – Change Request Form 10

Annex B Access to Proposed National Migration PoR 11

B1 Overview 11

C.1 Access to the NIPP Portal 11

C.2 Access to the LLU Portal 11



The introduction of Next Generation Networks (NGNs) is the most significant change to telecoms networks since competition was introduced two decades ago. These new networks have the potential to deliver significant benefits to consumers and communications providers, including BT. BT’s NGN, the 21st Century Network (21CN) will transform the way BT delivers services to all of its customers.

BT understands that each of its Wholesale Communications Provider (CP) customers is not only a stakeholder, but is also an important collaborator in the migration to the 21st Century Network. For 21CN to be successful, each CP must be able to effectively manage its business through the transition, in many cases effecting its own migration to next-generation services.

BT is committed to consulting fully and transparently with CPs and Ofcom in developing 21CN through Consult21; this continuing programme is further underpinned by the TSR Undertakings. During the period October to December 2005, BT shared its provisional PSTN Migration Schedule with CPs, giving CPs the opportunity to comment upon the proposal and to enable network and operational planning to commence. In January, BT published its Plan of Record for Migration of PSTN Voice Services.

As described in the 21CN Implementation Strategy and Plan issued on 28th April 2006, BT has prepared a provisional update to the Plan of Record for migrating PSTN services incorporating the schedule for migrating IPstream services; this in line with feedback from the original consultation. At this stage, BT has no plans for migrating customers of DataStream service.

1.2Basis of Publishing the Provisional Plan of Record

This provisional issue 2 of the National Migration Plan of Record (NMP) is intended for CPs to assist in determining the operational and technical impact of migration in line with the proposed schedule. In its final form, it will provide support to assist CP’s Network and Business Planning activities. In the absence of feedback from CPs on this provisional issue, BT will be initiating a consultation on this document starting on 12th June 2006.

The timetable within this provisional update of the NMP represents the earliest dates BT is considering deploying its 21st Century Network; these dates may change as a result of other consultation activities.

This provisional updated of the NMP should be viewed as BT’s proposal to CPs on current likely sequencing of migration activity; it remains subject to successful resolution of a series of complex technical issues.

This provisional updated of the NMP provides those CPs with whom BT has a direct interconnect relationship, LLU relationship, or take BT’s broadband services, details of sequencing and timing of migrating existing PSTN and broadband services onto 21CN. The NMP has been structured to reflect the different information needs of this diverse audience:

  • The management overview and content of the datasets (this document)

  • An Interconnect dataset addressing the timetable and network inventory issues, including NGS switches, for those CPs with whom BT has a direct voice interconnect relationship

  • An IPstream dataset addressing the timetable and network inventory issues, but excluding NGS switches details, for those CPs with whom BT has a LLU relationship

1.3Overview of Migration Schedule

The migration schedule is structured into an overall migration schedule together with a number of inter-locking datasets that provide the necessary network information to enable CPs to understand operational impact.




NMP Overview (this document)




IPstream migration dates




PSTN migration dates



Concentrator Number block map



Metro Nodes



Tier 1 MSANs



Non Tier 1 MSANs



NGS Mapping Details


IPstream migration dates

A single table providing the mapping between each exchange with the associated code shows when IPstream services will be migrated. For those sites where IPstream services running over 21CN will be available prior to migration of PSTN services, a second earlier date is given detailing when IPstream services will be available.

PSTN migration dates

Migration Schedule shows for each of BT’s existing concentrators, updated Metro and MSAN mapping details and revised dates for migration PSTN end-customer services. To assist CPs in understanding the impact of the change from the Plan of Record published in January 2006, we have included the previous date for comparison purposes.

Concentrator Number Block Map

Concentrator Number Block Mapping is provided detailing the mapping between number blocks and BT’s concentrators

Metro Nodes

List of Metro nodes and their 1141 codes

Tier 1 MSANs

List if MSAN locations and their generic 1141 code for MSANs at these locations

Non Tier 1 MSANs

List of non-Tier 1 MSANs locations and their generic 1141 code

NGS Mapping Details

    • NGS mapping table detailing the mapping between Metro nodes and NGS switches

    • NGS Mapping – Detailing the mapping between BT’s existing DLEs and NGS switches.

1.3.1IPstream Migration

BT's plan for IP stream migration during Pathfinder and in the national migration period starting in January 2008 is to migrate IPstream consumers to the 21CN network shortly (normally 3-4 weeks) after completing the migration of PSTN services at an exchange.

However, during July –December 2007, BT will be migrating IPstream customers to a dedicated Broadband MSAN at 640 exchanges before the migration of PSTN services at those sites. Following completion of PSTN migration at these sites, BT will migrate IPstream customers onto a combined PSTN and Broadband services MSAN.

1.4Purpose of this Document

This document replaces the Plan of Record issued by BT in January 2006, and is provided at provisional status to support other consultation activities related to the publication of the 21CN Implementation Strategy and Plan on 28th April 2006. Following the conclusion of these activities, BT intends to formally publish this plan at re-publish this plan at issue status in July 2006.

2Ongoing Management

The objective behind publication of the NMP is to baseline a plan that BT and its Communication Provider customers can then use for network planning purposes. It is unlikely that a 5-year plan will remain fixed, but given the complexity of this programme, BT believes that having such a shared view is necessary.

Through the Migration Proposal Consultation conducted between October-December 2005, BT developed Change Management processes which will remain enforce throughout the migration.

2.1Sequencing and Timing

The level of detail shared within the NMP is currently by calendar quarter the associated migration activity is planned to take place. BT recognises that CPs will need a further level of detail associated with each DLE migration. This not the purpose of the NMP.

It is BT’s intent to develop detailed migration schedules underpinning the NMP, the format and distribution of which will be agreed through the Implementation & Migration Working Group (Command and Control Experts forum).

2.2NMP Change Requests

BT recognises that following the publication of this NMP, CPs may require changes to this plan at the quarterly level. If, as a CP you wish to be kept informed of these change requests, please see paragraph 2.2.1 below.

CPs are invited to note that if BT requires a change to the NMP, BT will follow this same process.

BT does not envisage this change request process being operated following the issue of high-level SANs for a particular tranche of DLE migrations. For avoidance of doubt, BT anticipates this activity taking place typically 18 months prior to the end-customer PSTN migration dates shown in the NMP.

2.2.1Change Request Process

The Change Request Process will operate on the following principles:

  1. Change Requests should be submitted by Communications Provider’s using the form contained within Annex A, to include details of the change required and its associated rationale/impacts

  2. Change Requests will be recorded by BT, and each Change Request Form will be issued with a unique reference number which will be provided to the originating Communications Provider

  3. If you wish to register to receive visibility of future NMP Change Requests, simply email providing a contact email address* and confirming that your company wishes to receive notification of Change Requests. You may do this at any time subsequent to this date but the distribution list will be updated quarterly in line with the NMP publication dates. Please note: if you have already registered, you do not need to register again.

*Communication Providers should note that the email address provided (subject to notified changes) will be the sole email address used by BT for the industry notification of Change Requests received.

  1. Change Requests will be circulated to BT for Impact Analysis, and will be circulated to those Communications Providers who have requested visibility.

    • Change Requests circulated to CPs will identify only the Unique Reference Number and the nature of the change requested; for example “DLE A which is currently scheduled in QB 200C is swapped with DLE X which is currently scheduled in QY of 200Z”.

    • If they wish to, CPs will have 5 working days following circulation of the Change Request form to notify BT (via email to on the Change Request form) of any adverse impacts of such a change (should it be accepted).

  2. Change Requests will be assessed for their impact against this NMP, and the 21CN Implementation Plan

    • BT will collate all Change Requests and the associated impact analysis from BT & industry for further adjudication, where necessary

  3. The outcome of the Change Request will be communicated to the originating CP


A joint BT & Industry panel will, where necessary, adjudicate Change Requests received. The adjudication panel will be asked to adjudicate recommendations made following impact analysis against each Change Request.

The joint Industry/BT adjudication board comprises six members – 3 from BT Group and 3 from other CPs – and the BT Co-chair of the Implementation & Migration Working Group.

2.3Target NGS Capacity Check Process

In line with BT’s preferred method, prior to any of end customers from a DLE, BT intends to migrate any existing Interconnect Communication Provider routes from the DLE onto a Next Generation Switch. As part of the System Alteration Notification (SAN) process, BT will notify the Interconnect Communications Provider of which NGS their existing DLE route will be targeted into. BT has used a number of criteria to establish which NGS to target - including port, signalling, and processing capacity checks etc. – however, BT does recognise that there may be sound business reasons why an Interconnect Communications Provider may wish to target an alternative NGS.

BT envisages that the Interconnect Communications Provider will raise such requests with their Technical Account Manager (TAM), following the issue of the appropriate DSAN.

The BT team responsible for managing NGS capacity will review, as a batch, all capacity check requests submitted for a migration tranche in order that no request is dealt with in isolation, and that each Communications Provider is treated fairly.


BT will operate a change control process to modify the NMP over the course of the 5-year implementation period. It is anticipated that this document will not change unless any of the processes documented here change. If this is the case, BT will publish a revised version to all CPs.

BT will publish an update to the NMP, under change control, on a quarterly basis incorporating all the accepted Change Requests from the previous period. The plan will be published within the first working week of each calendar quarter.

It is important to note that through acceptance and use of this NMP, BT understands CPs are NOT offering unconditional consent to the 21CN migration. Discussions around issues such as the migration of obligatory products and cost recovery will continue to be progressed at the relevant Consult21 Working Groups and/or in bi-lateral discussions.

2.5Plan of Record Timetable

Following the publication of the NMP at full issue 2 status in July 2006, it is BT's intention to republish this documentation as follows:

NMP Overview As required, BT anticipates that the overview will only be updated should the processes which are documented within are updated or amended.

Migration Schedule Quarterly reflecting amendments made to the schedule via the operation of the NMP Change Control Process in the preceding quarter

Supporting data As required in line with established processes and procedures





21st Century Network [BT]


Communications Provider (Generic term)


Digital Local Exchange [BT]


Digital Subscriber Line Access Multiplexer


End User [BT].


The carrying out and execution of the agreed schedule for building and establishing full operation of the 21st Century Network.


Implementation & Migration Working Group


In-span Interconnect


Next Generation Network


Next Generation Switch


Network Information Publication Principles [BT]


National Infrastructure Security Coordination Centre


21CN National Migration Plan of Record for PSTN and Broadband Services; i.e. this document and its supporting datasets.

mass migration

High volume migration following completion of the Pathfinder phase.


The physical activity of moving products, services, and connections to the new target architecture.


Multi-Protocol Label Switching [IETF]


Multi-Service Access Node [BT]


BTs new service line of business


Point of Presence


Public Switched Telephone Network


System Alternation Notification


Service Provider


Ofcom’s Strategic Review of Telecommunications


Voice over Internet Protocol

Annex A – Change Request Form

Section A: The contents of this section will be shared.

CR Reference

(for BT use only):

CR Title:

Description of requested change: (please keep brief and avoid abbreviations)

For Example: Please move X to a timeslot before week 25 because it aligns better with our programme

Date CR raised: (dd/mm/yy)

Section B: The contents of this section will be treated as confidential.

CR Initiator Company, Requestor Name, 21CN email & contact details

Note: BT have asked for generic email and contact details from the CP for continuity reasons where people are leaving/joining organisations

Summary of reasons for the change and benefits:

Justification for the change:

Risks and issues:

Impact if change is NOT approved

Associated CRs (if any)

Any other relevant information

Once completed please return to

Annex B Access to Proposed National Migration PoR

B1 Overview

The national migration datasets contain BT commercially sensitive information and access to this information will be on secure web sites.

  • BT Wholesale’s NIPP for CPs with Interconnect contracts

  • Openreach’s LLU portal for CPs with LLU contracts

Part of the 21CN infrastructure forms parts of the UK national infrastructure. In order to comply with UK Government’s requirements in respect to handling this information, the geographic locational information of Metro nodes has been restricted. UK Government’s National Infrastructure Security Co-ordination Centre,, controls access to this information.

Broadband customers who do not full into one of the above categories should approach their BT Wholesale Account Manager who will arrange access to the information; however this will be subject to a Non-Disclosure Agreement.

C.1 Access to the NIPP Portal

To access the NIPP portal, you will need to become a registered user of the web site, and then request your BT Wholesale Commercial Manager to provide an Access Key for the NIPP portal. With this information, you will need to login into the web site using your registered username and password, scroll down screen until you see “FIND OUT MORE” section on the right hand side, click the “Enhanced Services” link, select “Our Networks” option and enter your Access Key. At this stage, you will see NIPP in the menu under “Manage Networks” on the right hand side of the screen.

C.2 Access to the LLU Portal

Access to the LLU portal is available via the following URL:

In order to use this URL who will need to be registered as an LLU operator; this can be obtained via your Openreach Commercial Manager.

 It is BT’s standard policy to preserve the NMP as a quarter-by-quarter view of the schedule, but for the period to 1st January 2008, BT is providing a greater level of detail: for migrations before 1st July 2007, BT is providing its estimated week when the migration has been scheduled to take place, and for migrations between July-December 2007 BT has provided the calendar month. The dates associated with IPstream migration are subject to completing a series of site engineering feasibility studies, this work is expected to be completed in July 2006.

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