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Class-4/Class-5 Replacement: Current Situation. The replacement of core legacy C4/C5 infrastructure is happening now and through various approaches.The incumbent telcos are searching ways how to modernize and upgrade the existing circuit-switched TDM networks to multimedia IP networks.The network

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    1. June 16 , 2010 C4/C5 Replacement: Next-Gen Services and the Reasoning behind a Complex Network Transformation

    2. Presenter + Moderator 1

    3. Class-4/Class-5 Replacement: Current Situation The replacement of core legacy C4/C5 infrastructure is happening now and through various approaches. The incumbent telcos are searching ways how to modernize and upgrade the existing circuit-switched TDM networks to multimedia IP networks. The network replacement/transformation process is very complex and requires clear concept. The replacement of narrowband access infrastructure: Is risky regarding preserving end-user experiences and services Represents the biggest cost for operators 2

    4. The Drivers and the Reasoning Behind… Cost reduction (OPEX saving justifying the CAPEX). High maintenance costs, legacy elements are reaching end of life, no support, experts, training or troubleshooting. Difficult implementation of new competitive services. A tendency for one common transport network (IP based). From infrastructure to service centric oriented providers. More flexible core platform for deployment of new services. The threat from competition and over the top web providers. 3

    5. 4

    6. 5 The typical modernization process of carrier infrastructure Phase 1: Class4 replacement Replacing legacy PDH/SDH, ATM transport network with more economical and efficient IP/MPLS and class4 switches with NGN/IMS softswitches. No changes for the end-users. Phase 2: Class5 replacement The direct influence on the access infrastructure. Different deployment models: CO POTS AGW blades inside MSAN, POTS over BB, VoIP SIP phones, internet VoIP clients. Changes in end-user experience. Phase 3: Transition to IMS infrastructure and a partnership with Web2.0 service providers Step by step migration to IMS according to required services. Opening the network via APIs to third party web applications.

    7. Hierarchy in the replacement strategy International C4 transit switches National C4 transit switches Combi C4/C5 city/regional switches Local C5 switches Replacement or reuse of access nodes The replacement and migration to all IP network requires a harmonized strategy on all topology and hierarchical levels. Strategy depends on: previous investments, time depending reconfiguration processes, new services that will be delivered, the content that will go through access etc. 6

    8. Replacement solution Building Blocks and its Interfaces 7

    9. 8 Technical solution scheme

    10. Key C4/C5 replacement steps Establishing the trunking interconnection between the existing systems (interoperability). Integration with existing OSS/BSS systems. Integration with existing service delivery platforms (IN SCP, VAS, IVR, Pre-paid, TVOT, call centers etc.) Setting up: Existing subscriber’s supplementary services Regulatory services: NP, SORM/LI, CAC etc. Network services: TVOT, emergency calls, priority calls etc. Gradual migration of SS7 signaling links, E1 voice channels and subscriber ports can start. 9

    11. Next-gen revenue generating services Video services Soft phone, SIP services Intelligent broadband access Next-gen IP TV Fixed-mobile convergence Unified communication services Nomadic/Mobility services Presence status, Instant messaging, chat, file tran. Advertizing, security, location services Business server, IP Centrex, Virtual PBX, Virtual office 10

    12. Transformation towards IMS architecture

    13. Key success factors: Strong cooperation and synchronized workflow between vendor and operator are a must to achieve the uninterrupted migration process. The replacement process requires a wide list of professional vendor services: Survey of the actual network state Preparation of the actual migration steps Preparation of all the necessary data for system databases migration Checking service operation after implemented migration steps etc. A cooperation with a skilled and experienced integration partner with its own product portfolio and knowledge from different telecommunications technologies and systems is strongly advised. 12

    14. Questions?

    15. 14

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