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Network Information Publication

Information for use by CPs about the BT
NGN in the UK briefing: C21-NS-004

Draft A, 29 April 2006




April 2006




Issued by: Tim Wright                 Page 1 of 16
Issue No: Draft A
Date:      11 May 2006            For Consult21 use
                                                                                     For Consult21 use



        Contents                                                                                Page




1         Introduction                                                                               3

    1.1 General                                                                                      3
    1.2 NIP structure and scope                                                                      3

2         Publication principles                                                                     4

    2.1 Ownership                                                                                    4
    2.2 Access                                                                                       4
    2.3 Disclaimer                                                                                   4

3         Network design and support of traffic types                                                5

    3.1    Physical design and topology                                                              5
    3.2    Access and backhaul design                                                                5
    3.3    Metro, Core and interconnecting transmission design                                       6
    3.4    i-Node and Layer 4 voice application design                                               7
    3.5    Support of traffic types                                                                  7
    3.6    Interconnect and handover                                                                 10

4         Network inventory                                                                     12


5         Numbering and service addressing                                                      13


6         NIP Acronym Expansions                                                                14


7         Document History & Contact Details                                                    16


About this draft …

Draft A of the NIP comprises this top-level framework document only without the Annexes. The
Annexes will be made available in Draft B, currently scheduled for end May




Issued by: Tim Wright                                                                 Page 2 of 16
Issue No: Draft A
Date:      11 May 2006                                                            For Consult21 use
                                                                                          For Consult21 use




1 Introduction
1.1     General
This is a top-level framework document on information for use by CPs on BT’s next generation network
in the UK. The detailed information is published in a series of Annexes that will be periodically updated.
This document and its Annexes are referred to as the Network Information Publication (NIP). The
purpose of the NIP is to provide CPs with information about BT’s network that CPs need to assist in
their interconnect and deployment planning. The NIP is owned and produced by BT although its scope
and level of detail has been steered by CPs under Consult21. The NIP will develop over time as the
design and deployment of the BT NGN in the UK proceeds.

It is expected that the NIP data will be commercially relevant to CPs and might be referenced from new
contracts for MSILs / NGN interconnect, etc in a similar was as the existing NIPP is used by SIA.

The NIP is the next generation equivalent of the existing Network Information Publication Principles
(NIPP) and recognises the multi-service nature of NGNs.


1.2     NIP structure and scope
The NIP is in four main parts
1. Publication principles (contained in this framework document) – This covers the ownership,
   authority, update frequency, systems support (if any), distribution and access arrangements, etc of
   the NIP.
2. Network design and support of traffic types (given in outline in Section 3 and in detail in Annex
   A) - This part describes the functional nodes, their generic names (eg Metro Node). It shows the
   signalling and media flow protocols. It gives a view of the resilience between each level of the
   topology for each network layer. It shows the functions for each type of functional node and, where
   appropriate, the mapping of functions into equipments. It shows topologically the points of
   handover. It also gives a view of how the media flows of the various traffic types are handled. It
   includes the entity model - ie the generic data model for describing the relationships between PoPs
   and functional nodes. This is relatively stable information. The first draft draws heavily on the
   material BT presented to CPs at the Network Design Event on 3 April 2006 and focuses on PSTN
   voice (although not exclusively). Future issues will be more comprehensive and will be more
   specific about how the various products are supported.
3. Network inventory (given in outline in Section 4 and in detail in Annex B) - This part lists the
   locations of the various types of functional nodes. It lists the PoP 1141 codes and the 1141 codes
   of the functional nodes (eg Metro, Tier 1 MSAN) located within the PoPs. It ensures consistency of
   these codes across the product areas. It will provide mappings of concentrators to DLEs,
   concentrators to MSAN, DSLAMs to MSANs, concentrator number ranges, MSAN type (ie Tier 1 or
   not), MSAN to primary Metro, MSAN to secondary Metro, Metro to NGS. It provides the service
   capabilities at the various locations. It also gives the various 1141 codes from which the postal
   addresses can be derived from the NISCC web site. The first draft draws heavily on the
   deployment plan issued by BT. The latest version of the deployment plan has reflects the new
   priorities and includes both broadband and PSTN migration. This part will be up-issued frequently
   (possibly even monthly in the early days) as traffic grows, as new nodes are deployed, as nodes
   get reparented, as new points of handover are opened, etc.
4. Numbering and service addressing (given in outline in Section 5 and in detail in Annex C) – This
   part is the NGN equivalent of that part of the existing NIPP that essentially provides a matrix of
   PSTN/ISDN number groups against actual interconnect locations. So, if a caller dials a number,
   the call will be routed to the defined interconnect location for handover. The data is derived from
   the Network Charge Data Base and is the basis of Element-Based Charging. CPs currently make
   use of this information to help plan and cost optimise their networks. This part has not yet been
   scoped. It is noted that, in an IP world, call routing will be different and some aspects of this are
   currently under consultation.



Issued by: Tim Wright                                                                      Page 3 of 16
Issue No: Draft A
Date:      11 May 2006                                                                 For Consult21 use
                                                                                         For Consult21 use




2 Publication principles
2.1     Ownership
BT own the content of the NIP and will update it as necessary. Responsibility for updating the NIP rests
with [John Baughan + contact details - to be confirmed]


2.2     Access
The NIP will be made available free of charge to CPs that have or plan to have points of handover to
BT’s NGN. The NIP will be published on a number of web sites with access security mechanisms.
Requests for the access should be made to [BT contact details - to be provided].


2.3     Disclaimer
Although the NIP is published in good faith, BT cannot accept liability (whether due to negligence or
otherwise) for loss arising as a result of reliance upon any of the information it contains.




Issued by: Tim Wright                                                                      Page 4 of 16
Issue No: Draft A
Date:      11 May 2006                                                                For Consult21 use
                                                                                                For Consult21 use




3 Network design and support of traffic types
[Taken from the Network Design Event held on 3 April 2006]. Greater detail is given in Annex A.
References to the relevant NICC ND documents will be given in Annex A.
3.1     Physical design and topology
3.1.1 Points of Presence
The types of PoP and relationship with functional nodes is shown below.




3.1.2 Basic network topology
The basic physical topology is shown below.
                                                                Inner core physical PoPs
                                                                • 8 PoPs (inc. 2-4 internet PoPs)
                                                                • Fully meshed



                                                               Outer core physical PoPs
                                                               • 12 PoPs
                                                               • At least triple parented to inner core



                                                               Metro physical PoPs
                                                               • 86 PoPs
                                                               • Dual parented to core


                                                               Tier 1 MSAN physical PoPs
                                                               • Circa 1000 sites


                                                                MSAN physical PoPs
                                                                • Circa 4400 sites




3.1.3 Network inventory data model
1141 codes are used as the single location identifier for 21CN physical PoPs and the functional nodes
(eg CMSAN, Metro) located within the PoPs.
3.2     Access and backhaul design
[Taken from Slides 32 to 56 of the Network Design Event]
Issued by: Tim Wright                                                                             Page 5 of 16
Issue No: Draft A
Date:      11 May 2006                                                                      For Consult21 use
                                                                                               For Consult21 use



The MSAN physical PoP types and the connectivity back to the parent Metro Node is shown below.
There are three types of MSAN physical PoPs:
1. Copper MSAN physical PoP
    Provides copper line drive and switching/aggregation functions.
    The backhaul transmission is SDH with Ethernet traffic encapsulated within GFP (Generic
       Framing Protocol) and protected using either SNCP or higher layer protection.
    Dual parenting to Fibre Access or WDM Access nodes unless impractical
2. Fibre MSAN physical PoP
    Provides fibre/copper line drive and switching/aggregation functions.
    The backhaul transmission is SDH with Ethernet traffic encapsulated within GFP (Generic
       Framing Protocol) on dual homed routes.
    Ethernet traffic encapsulated in GFP is protected using either SNCP or higher layer protection.
3. Tier 1 MSAN physical PoP (Also known as WDM MSAN physical PoP)
    Provides WDM transmission functions, fibre/copper line drive and switching / aggregation
       functions to two Metro Nodes.
    Ethernet traffic will be back-hauled using Gigabit Ethernet over CWDM (or DWDM if capacity
       demands) to the Metro node.
    Ethernet LAG (Link Aggregation) is used for protection of Ethernet transported traffic.


                                              Core Node
      Metro Node                              WDM    WDM                         Metro Node
                         Ethernet                                     Ethernet
                          Switch                                       Switch
        4/4/3                                                                        4/4/3
        SDXC                                                                         SDXC
                           AWDM                                        AWDM




                            AWDM     AWDM   AWDM    AWDM       AWDM   AWDM
                                                                                              Tier 1 MSAN
                                                                                              Physical PoP
                                                                                                (WDM MSAN
                          FMSAN             FMSAN                     FMSAN                     Physical PoP)
           CMSAN                                       CMSAN                       CMSAN




                               FMSAN           FMSAN              FMSAN                    FMSAN
                                                                                           Physical
                                                                                             PoP
                    CMSAN                      CMSAN                       CMSAN



                                                                                 CMSAN
                                    CMSAN                        CMSAN           Physical
                                                                                   PoP

3.3     Metro, Core and interconnecting transmission design
[Taken from Slides 57 to 67 of the Network Design Event]
There are three types of Metro/Core physical PoPs:
1. Inner core physical PoP
     8 PoPs
     2 to 4 PoPs with direct Internet access
     Fully meshed – 10Gbit/s links
     Transmission layer resilience
     Full service functionality (Ethernet, voice, broadband, TDM leased lines)
     2 to 4 NMCs
2. Outer core physical PoP
     12 PoPs
     Triple parented or more off Inner Core
     Partially meshed - 10Gbit/s links
     Some sideways links
     Transmission layer resilience
     Full service functionality at most PoPs
3. Metro physical PoP

Issued by: Tim Wright                                                                            Page 6 of 16
Issue No: Draft A
Date:      11 May 2006                                                                       For Consult21 use
                                                                                                                                              For Consult21 use



            86 PoPs
            Dual parented to core – 10Gbit/s links
            Transmission layer resilience and MPLS FRR to Core
            Some service functionality

The service components contained in an Inner Core physical PoP are shown below.
                                                                                          Co-Located iNode

                                                                                                     RDB
    Sig
   Inter-                                                                                       Call          Call
    cnct                                                               Performance             Server        Server
                                                                       Monitoring             (Active)      (Backup)
                                       MGW                             Router

   PSTN            4/4/3
   NGS             SDXC                BGW
                                                                                                     Media
                                                                                                     Server

   OCP                                  FW
                                                    Infrastructure
   Inter-                                           Ethernet
    cnct                                            Switches                                                  NMC PE
                                                                                                              Routers

                                                                           Voice PE Routers
 MSAN             AWDM

   MSAN                           Ethernet Edge Aggregator




                                                                                                                        DWDM
                                  & Ethernet PE Router
                                                                                                         Core P
                                                                            Route Reflector              Routers
                 WDM



                           BRAS              L2 Switches
                                                                                                                               BT’s Current
                             BRAS                                                                                                Internet
                                                                                                                                 Network
                                                             L3 Switches




3.4         i-Node and Layer 4 voice application design
[Taken from Slides 70 to 76 of the Network Design Event]
The logical design for voice (PTSN emulation, customer VPN, internet voice) and multimedia services is
shown below. All voice is supported as VoIP.




3.5         Support of traffic types
[Taken from Slides 77 to 96 of the Network Design Event]
Some examples are shown below



Issued by: Tim Wright                                                                                                                          Page 7 of 16
Issue No: Draft A
Date:      11 May 2006                                                                                                                 For Consult21 use
                                                                                   For Consult21 use



3.5.1 Voice
An NGN on-net call (to and from same CMSAN) is shown below.




An NGN to legacy PSTN call is shown below.




A voice IP interconnect is shown below. This is still subject to consultation.




Issued by: Tim Wright                                                                Page 8 of 16
Issue No: Draft A
Date:      11 May 2006                                                           For Consult21 use
                                                                                   For Consult21 use




3.5.2 Broadband IP access
A broadband IP traffic flow from BT NGN BRAS to the BT Internet Network is shown below.




3.5.3 Ethernet
Examples of a number of end user Ethernet flows are shown below.




Issued by: Tim Wright                                                                Page 9 of 16
Issue No: Draft A
Date:      11 May 2006                                                           For Consult21 use
                                                                           For Consult21 use




3.5.4 TDM
An example of TDM circuits with aggregate presentation is shown below.




3.6     Interconnect and handover
Examples of multi-service points of handover are shown below.




Issued by: Tim Wright                                                        Page 10 of 16
Issue No: Draft A
Date:      11 May 2006                                                   For Consult21 use
                           For Consult21 use




Issued by: Tim Wright        Page 11 of 16
Issue No: Draft A
Date:      11 May 2006   For Consult21 use
                                                                                                                                 For Consult21 use




4 Network inventory
[Drawn from the network migration plan] The detail is given in Annex B.

This part lists the locations of the various types of functional node and the mappings between them. It
provides the service capabilities at the various functional nodes. The scope of the various mappings is
shown below.

                            DLE
                         Name & 1141


                       Concentrator                      DSLAM
                Name, 1141, number range               Name, 1141


                                            MSAN
                                    Name, 1141, Tier 1 or not



    i-Node (secondary)                                                               Metro Node (secondary)
        Name, 1141                                                           Name, 1141, outer core, inner core, PoSI or not


                     i-Node (primary)                         Metro Node (primary)
                       Name, 1141                   Name, 1141, outer core, inner core, PoSI or not



                                                                                                  NGS (1)                  NGS (2)
                                                                                                 Name, 1141               Name, 1141



                                                                                                      DLE                       DLE
                                                                                           Name, 1141, DLE NNI       Name, 1141, DLE NNI


Mappings between Metro Node and PoP 1141 codes and between i-Node and PoP 1141 codes are [to
be held] in NISCC. Mappings of PoP 1141 codes to postal addresses are also [to be held] in NISCC.

These mappings draw heavily on the deployment plan [to be] issued by BT [in early May 2006]. This
version of the deployment plan reflects the new priorities and includes both broadband and PSTN
migration. This part of the NIP will be up-issued frequently (possibly even monthly in the early days) as
traffic grows, as new nodes are deployed, as nodes are re-parented, as new points of handover are
opened, etc.




Issued by: Tim Wright                                                                                                              Page 12 of 16
Issue No: Draft A
Date:      11 May 2006                                                                                                         For Consult21 use
                                       For Consult21 use




5 Numbering and service addressing
[not yet scoped




Issued by: Tim Wright                    Page 13 of 16
Issue No: Draft A
Date:      11 May 2006               For Consult21 use
                                                                                  For Consult21 use




6 NIP Acronym Expansions

3GPP           3rd Generation Partnership Project      GFP    Generic Framing Procedure
ACGF           Access Gateway Control Function         GR     Graceful Restart
ADM            Add-drop Multiplexer [SDH]              HSS    Home Subscriber Server
ADQ            Application-Driven Quality of service   HTTP   HyperText Transfer Protocol
               [BT]                                    IC     Interconnect
ADSL           Asymmetric Digital Subscriber Line      ICT    Information and Communication
ASP            Application Service Provider                   Technology
ATM            Asynchronous Transfer Mode              IEEE   Institute of Electronic and Electrical
AWDM           Access WDM                                     Engineers [USA]
BCM            Business Continuity Management          IETF   Internet Engineering Task Force
BF             Border Function                         IMS    IP Multimedia Subsystem
BFD            Bidirectional Forwarding Detection      IN     Intelligent Network
BGW            Border Gateway                          INAP   Intelligent Network Application
BRAS           Broadband Remote Access Server                 Protocol [C7]
BSS            Business Support System                 IP     Internet Protocol [IETF]
BWM            BandWidth Manager                       IPv4   Internet Protocol Version 4 [IETF]
CG             Customer Gateway                        IPv6   Internet Protocol Version 6 [IETF]
CMSAN          Copper Multi Service Access Node        ISDN   Integrated Services Digital Network
COTS           Commercial Off-The-Shelf                ISH    In Span Handover
CP             Communications Provider [BT]            ISP    Internet Service Provider
CS             Call Server                             ISUP   Integrated Services User Part [C7]
CSH            Customer Sited Handover                 ITU    International Telecommunications
C-VLAN         Customer (inner) Virtual Local Area            Union
               Network                                 IUP    Interconnect User Part [C7]
CWDM           Coarse Wavelength Division              IVR    Interactive Voice Response
               Multiplexing                            LAC    L2TP Access Concentrator [Cisco]
DA             Directory Assistance [BT]               LAG    Link Aggregation
DASS           Digital Access Signalling System        LAN    Local Area Network
DB             Data-Base                               LDP    Label Distribution Protocol [IETF]
DCN            Data Communications Network             LL     Liberal Label
DLE            Digital Local Exchange [BT]             MAC    Medium Access Control
DNS            Domain Name System/Server [IETF]        MDF    Main Distribution Frame
DPI            Deep Packet Inspection                  MF     Multi-Frequency
DPNSS          Digital Private Networking Signalling   MGW    Media Gateway
               System                                  MM     Multimedia
DSL            Digital Subscriber Line                 MNO    Mobile Network Operator
DSLAM          Digital Subscriber Line Access          MPLS   Multi-Protocol Label Switching [IETF]
               Multiplexer                             MS     Media Server
DU LL ret      Downstream Unsolicited Liberal          MSAN   Multi-Service Access Node [BT]
               Label retention                         MSIL   Multi Service Interconnect Link
DWDM           Dense Wavelength Division               NGN    Next Generation Network
               Multiplexing                            NGS    Next Generation Switch [BT]
DXC            Digital Cross-connect                   NICC   Network Interoperability Consultative
E1             {Europe} 1 [ITU-T]                             Committee
EEA            Ethernet Edge Aggregator                NMC    Network Management Centre
ENUM           Electronic NUMbering                    NTE    Network Termination Equipment
EOI            Equivalence of Input                    OA     Operator Assistance [BT]
ETSI           European Telecommunications             OAM    Operations Administration and
               Standards Institute                            Maintenance
FMSAN          Fibre Multi Service Access Node         OCP    Other Communications Provider [BT]
FNET           FeatureNet [BT]                         OSPF   Open Shortest Path First protocol
FRR            Fast Re-Route [MPLS]                           [IETF]
FW             Fire Wall                               OSS    Operational Support System
GbE            Gigabit Ethernet                        P      Provider (router)
GE             Gigabit Ethernet                        PBT    Provider Backbone Transport

Issued by: Tim Wright                                                              Page 14 of 16
Issue No: Draft A
Date:      11 May 2006                                                         For Consult21 use
                                                                                  For Consult21 use



PBX            Private Branch Exchange                 vPE     Voice Provider Edge Router
PC             Personal/Portable Computer              VPN     Virtual Private Network
PDA            Personal Digital Assistant              VTGW    Virtual Trunk Gateway
PDH            Plesiochronous Digital Hierarchy        WDM     Wavelength Division Multiplexing
PE             Provider Edge                           WES-B   Wholesale Extension Service
PoP            Point of Presence                               Backhaul {BT]
POTS           Plain Old Telephony Service             WiFi    Wireless Fidelity
PPC            Partial Private Circuit                 WiMAX   Wireless Metropolitan Area X?
PPP            Point-to-Point Protocol [IETF]                  [WiMAX Forum]
PPPoA          Point-to-Point Protocol over ATM        xDSL    ADSL, HDSL, SDSL, VDSL, etc.
PPPoE          Point-to-Point Protocol over EtherNet
               [IETF]
PSTN           Public Switched Telephone Network
PSU            Power Supply Unit
PTA            PPP Termination and Aggregation
PWE3           Pseudo Wire Emulation Edge To
               Edge Router
RCU            Remote Concentrator Unit
RDB            Routing Data Base
RFC            Request for Comment [IETF]
RIDE           Recorded Information Distribution
               Equipment
ROMES          Rationalisation Of Mobile Escalation
               Sites [BT]
RR             Route Reflector
RSVP           Resource ReSerVation Protocol
               [IETF]
SBC            Session Border Controller
SDH            Synchronous Digital Hierarchy [ITU-
               T]
SDP            Service Delivery Platform [BT]
SDXC           Synchronous Digital Cross Connect
SIP            Session Initiation Protocol
SIP-I          SIP with encapsulated ISUP
SME            Small Medium Enterprise
SMP            Significant Market Power
SNCP           Sub-Network Connection Protection
               [SDH]
SPoF           Single Point of Failure
SPR            Signalling Point Relay
SS7            Signalling System No. 7 [ITU-T]
STM-n          Synchronous Transport Module
               (level) n [SDH]
STP            Signalling Transfer Point [ITU-T]
S-VLAN         Service (outer) Virtual Local Area
               Network
TDM            Time Division Multiplexing
TE             Traffic Engineering
TISPAN         Telecommunications and Internet
               Services and Protocols for Advanced
               Networks
TMF            TeleManagement Forum
TSR            Telecom Strategic Review [Ofcom]
URU            “You are you”
VAGW           Virtual Access Gateway
VC-n           Virtual Container (level) n [SDH]
VIC            Virtual Interconnect Circuit [BT]
VLAN           Virtual Local Area Network
VoIP           Voice over Internet Protocol
Issued by: Tim Wright                                                              Page 15 of 16
Issue No: Draft A
Date:      11 May 2006                                                         For Consult21 use
                                                                              For use under Consult21




7 Document History & Contact Details

Issue No           Date          Author           Comments
Draft A            11 May 2006   Tim Wright


Any comments relating to this document should be addressed to:   tim.c.wright@bt.com
                                                                 01977 594832




Issued by: Tim Wright                                                   Page 16 of 16
Issue No: Skeleton
Date:      29 April 2006                                                For use under Consult21

				
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