NG-Transport Tech Lecture15-16.ppt

The desire to find one simple encapsulation method

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The desire to find one simple encapsulation method that was capable of accommodating any data packet protocols Secondly, the need to use bandwidth accurately Solution … A new adaptation protocol layer is required and a new mapping mechanism for controlling bandwidth use
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15 Next Generation SDH Next-generation SDH is the evolution and enhancement of existing SDH networks It improves network efficiency and broadband service potential SDH Next Generation enables transporting data efficiently, without needing to replace the installed equipment base
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16 Next Generation SDH The only change needed to update the network is to replace the edge nodes The network is then ready to transport Ethernet
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17 Next Generation SDH How NG SDH resolve the problem Components of NG SDH: Generic Framing Protocol (GFP) Virtual Concatenation (VCAT) Link Capacity Adjustment Scheme (LCAS)
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18 Next Generation SDH These functions are implemented on the new MSSP nodes which are located at the edges of the network They interact with the client data packets that are aggregated over the SDH/SONET backplane that continues unchanged This means that the MSSPs represent the SDH Next Generation embedded in the legacy SDH network
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19 Next Generation SDH The architectures are increasingly demanding long haul transport that today can only be provided by SDH/DWDM having a massive installed base, developed over recent decades
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20 NG-SDH Features NG SDH enables operators to provide more data transport services while increasing the efficiency of installed SDH base The technology is implemented in the edge nodes only, no need to install an overlap network or migrating all the nodes This reduces the cost per bit delivered, and will attract new customers while keeping legacy services
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21 NG SDH Nodes Multiservice Provisioning Platform (MSPP) Includes SDH multiplexing, sometimes with add-drop, plus Ethernet ports, sometimes packet multiplexing and switching, sometimes WDM Multiservice Switching Platform (MSSP) MSPP with a large capacity for TDM switching Optical Edge Device (OED) An MSSP with no WDM functions
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22 NG SDH Nodes Multiservice Transport Node (MSTN) An MSPP with feature-rich packet switching Multiservice Access Node (MSAN) An MSPP designed for customer access, largely via copper pairs carrying Digital-Subscriber Line (DSL) services
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23 GENERIC FRAMING PROTOCOL Defined in ITU-T G.7041 Its a mechanism for mapping constant and variable bit rate data over a transport network like synchronous SDH frames GFP support many types of protocols
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24 GENERIC FRAMING PROTOCOL In any case GFP adds a very low overhead to increase the efficiency of the optical layer The client signals can be protocol data unit (PDU) oriented (like IP/PPP or Ethernet Media Access Control) or can be block-code oriented
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25 GFP-F Modes Currently, two modes of client signal adaptation are defined for GFP: Frame-Mapped GFP (GFP-F)
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  • Fall '19
  • Synchronous optical networking, Multiplexing, Wavelength-division multiplexing, osc, NG SDH

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