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									Concept of Automatically switched
        Optical Network




             - Rajesh, JTO




                    7/28/2011   Rajesh JTO RTTC Rajpura   1
               What is ASON?
The automatically switched optical network is a new
generation optical transmission Network.

                    Overview
Recently SDH optical communication system widely used
an telecommunication in backbone layer, metropolitan layer &
in access layer in transport network. SDH offers first
protection and excellent management performance.
 with the development of telecommunication network and
increasing user demands some problems in SDH systems
appear more than more serious such as low bandwidth utilize
and monotonous protection.
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ASON just come to solve the above problems

 The ASON is an optical transport network composed of
 ASON Network elements. ASON performance signaling
 transmission and switching. These NEs can store the
 topology, routing information of the whole network,
 automatically create and remove services through
 signaling.




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                                What is ASON / GMPLS
                                                                             ASON: Automatic Switched Optical
                                  NMS                                               Network, Requirements
                                                                                       defined by ITU-T.
     MP                                                                      GMPLS: Generalized Multi-Protocol
(Manage Plane)                                                                     Label Switching, A series
                     Network Management Interface      NMI      NMI                protocols (LMP, RSVP-TE,
                                                                                    OSPF) defined by IETF.

                                OCC              OCC
     CP                                                                       ASON/GMPLS Introduces control
(Control Plane)
                                                                                              plane to ON.
                                OCC        NNI                               It’s the first time to adopt dynamic
  UNI control     OCC                                  OCC        E-NNI
                                                                                          switching function.
                                                                                Distributed control plane is the
                                                                                                 trend.
                                                    Connection Control Interface
                                                                             The purpose of the control plane is
                                                                                               to:
               CCI                                      CCI
      TP                   NE              NE
                                                                              Enhance Network Reliability and
(Transport Plane)                                                                           Stability
                NE               NE               NE                          Lower Network TCO(Total Cost of
                                                                                          Ownership)
    UNI data
                                                                                Simplify Network Operation


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The Logical Architecture of an ASON can be divided into 3
planes:

   Transport Plane

   Control Plane

   Management Plane

•The Transport Plane contains a number switches ( optical or
otherwise) responsible for transporting user data via
connections. These switches are connected to each other via
PI (Physical Interface).
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•   The Control Plane is responsible for the actual
    resource and connection management within an ASN
    network. It consists of a series of OCC (Optical Connection
    Controllers), interconnected via NNIs ( Network to Network
    Interfaces).

   These OCCs have the following functions:
    Network Topology discovery (Resource discovery)
    Signaling, Routing,Address Assignment
    Connection Set-up/Tear-down
    Connection protection/restoration
    Traffic Engineering
    Wavelength assignment



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   Management Plane is basically a complement plane of
    control plane. It maintain the transport plane,
         the control plane and the whole system. Its main
    functions are as follows:-
       1- Performance management
       2- Fault management
       3-Configuration management
       4- Security management




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                      How does ASON/GMPLS
                                    work ?
 Automatic Resource Discovery (LMP)
  Lower OPEX                                  ?       ?             ?
 Mesh Networking (OSPF)
  Improve resource utilization
 Automatic Restoration (RSVP)
                                                  ?
  Enhance reliability




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              Where does ASON/GMPLS work

  Inter-city Network


                                                       • Mesh  networking improves
                                                       resource utilization
                                                       • Plug & play
                                                       • Fast expansion and upgrade
                                                       • SLAs
   Metro/Regional Network        Optical Transport Network


            IP Core




           Edge layer                                                          Router


                                                                               ASON node
Internet           IPTV     3G&NGN        VPN      Traditional Voice Service

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                      The Need for ASON

In an optical network without ASON, when-ever a user
requires more bandwidth, a new connection has to be requested
and the service provider has to manually plan and configure the
route in the network.


This is not only time consuming, but also wastes bandwidth
when the user economically uses the connection.The bandwidth
demand is going to increse with every momemts &IT has
become precious resource.We have the expectations from future
optical networks that they will be able to efficiently handle
resources as quickly as possible .



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        The Need for ASON
   ASON will be able to fulfill the requirements for the newer
    generation of optical networks such as:

    ◦   Fast and automatic end-to-end provisioning
    ◦   Fast and efficient re-routing
    ◦   Support of different clients, but optimized for IP
    ◦   Dynamic set up of connections
    ◦   Support of Optical Virtual Private Networks (OVPNs)
    ◦   Support of different levels of quality of service

   (These requirements are not restricted to optical networks and can be
    applied to any transport network (including SDH Networks)




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        Perfectly inter-working with
         traditional SDH network
                                                                         Intelligent circuit
                                   Virtual TE-link
    NMS: T2000

                                                     ASON Network


                                                                                    Intelligent circuit
                                                                                     The same fiber
                                                                                    Traditional circuit
               ASON NE                                Traditional
                                                      Network
               Traditional NE



   Hybrid Network of ASON network and traditional MSP-Ring
   Unified NMS of ASON NE and legacy NE
   E2E service point&click provisioning between traditional and ASON NE by Unified NMS
   The timeslot of ASON NE can be configured as static circuit
   Supports virtual TE-link


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      Supported optical transport services

 Permanent       OCh:- Permanent connection is a service
 connection computed before hand and created through NM.
 The traditional SDH connections are permanent connection.

 Switched     OCh:-Switched connection is a service connection requested by
  a terminal user like Router and then created in the ASON control plane through
  signaling at the UNI
 Soft   Permanent connection :-.setup from the management system
  using routing capabilities embedded in the network. It requires routing and
  signaling at the NNI to establish the connection.
 Optical Virtual private        Network
 Lamda trunking:




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    Resource Reservation
        The time slot created with ASON Services are managed by the
     ASON software and cannot be used by the any software to create
     permanent connection.
    Level Switching Path (LSP)
         The LSP is the path of ASON services passing through in ASON to
     create ASON services is to crate LSPs.
    Control Channel (CC)
             Control channels are created and maintained between adjacent
     nodes by link management protocols (LMP). Control channels divided
     into two types:-
1.   In fiber Control Channel:- Usage DCC channel (D4 to D12) and can be
     discovered automatically.
2.   Out of fiber Control Channel:- Usage the Ethernet link and need
     manual configuration.




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High Reliability Control Plane: control channel
backup
                                                   In-Band (D-byte)
                                                             Dm~Dn
                                                                                     Dm~Dn

                                   Dm~Dn                        Dm~Dn
      NMS                                                                         Dm~Dn
                                     Dm~Dn
                                                            Dm~Dn




                                                 Out-of-Band
                                                   (DCN)
  Supports in-band (D-byte) and/or out-of-band control channel.
  Provides 1+1 stand-by for control channels when both in-band and out-of-band are deployed.
  The working channel will switch to the backup one in case of working channel failure.




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 Control     Link:- Controls links are detected and maintained by OSPF
  protocol.All ASON NEs get the control topology of the network.
 Traffic   Engineering Link (T E Link):- T E Link is the traffic
  engineering link. The ASON, NEs sends its bandwidth information to other
  ASON NEs through the T E Link to provide for data route computation.
 Rerouting     :-rerouting is means of resuming services .when an LSP is
  disconnected, the source node queries and finds a best route to resume
  services.
 Rerouting     Lockout :-rerouting is not required after failure of LSP
  in some cases then we need rerouting lockout
 Rerouting     Priority :-when several LSPs have the same source node
  reroute simultaneously ,the LSP of higher priority reroutes first and has
  more possibility to reroute successfully.




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 Shared    risk link group (SR LG) :-fibers in the same optical
 cable have the same risks, when the cable is cut ,all fibers are cut.
 therefore ASON services should not be rerouted to another link that has
 the same risk.

        Topology Auto-Discovery
Control Topology Auto-Discovery :-after the fibers in an
ASON network are connected correctly ,each ASON NE discovers control
links automatically through OSPF and floods its own control link to the
whole network.
Service Topology Auto -Discovery :-After an ASON NE
creates a control channel between neighbors NEs through LMP,TE link
verification can be started. Each ASON NE floods its own TE links to the
whole network through OSPF-TE. Each NE then gets the network –wide
TE links. this is network wise service Topology.

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Control topology auto-discovery



       R1                                           R4




      R2

                                                  R3

                                               :ASON NE

                                               :User equipment



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Service topology auto-discovery




           R1                                            R4




          R2

                                                       R3

                                                    :ASON NE

                                                    :User equipment




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         End-To-End Configuration


•   The ASON supports both SDH permanent connections and end-to-end
   ASON ser vices. To configure an ASON ser vice , we only need to
   sp ecif y it s sou rce nod e , sink nod e , bandwidt h requirement and
   protection level. Service routing and cross connection at intermediate
   nodes are all automatically completed by the network.

•   As compared with the service configuration of the SDH network, it fully utilizes
    the routing and signaling functions of ASON NEs and thus it is convenient to
    configure the service.




                                             7/28/2011    Rajesh JTO RTTC Rajpura   33
                    Provide Multiple levels of service: SLA
   Index               Diamond                      Gold                              Silver                  Copper            Iron

Service level

                   • Permanent 1+1            • Virtual Ring              • Dynamic Restoration
                       Protection               Protection                   • Pre-Calculating
 Protection                                                                                                     None           None
                  • 1 + 1 Protection +        • Virtual Ring                    Restoration
  scheme
                      Restoration             Protection +                    • Shared Mesh
                   • 1 + 1 Protection          Restoration                      Restoration

                  Provide permanent       Performs as protection
                                                                           Real-time restoration
                 protection for service     most of the time, if
Description                                                                of service, no need of                 -              -
                when network resource      protection is invalid,
                                                                             standby resource
                      is utilizable         restoration works

                                            Protection time<
   Index        Protection time <50ms             50ms                     *Restoration time<2s                   -              -
                                          *Restoration time<2s

     BW                                                                                                             Very
                          low                    Medium                                High                                       Highest
 Utilization                                                                                                        high
                                               * Reference only , according to different networks & fibers cuts , the time is different


 Revenue               Very high                    High                             Medium                      low          Lowest


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   Different kinds of service for different customers’ needs.

 Protection and restoration combine for multi failures,
  improves the reliability

 Supports High and Low Restoration Priority

 Hitless interchanging on line between SLAs




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  DIAMOND SERVICE (PLATINUM SERVICE)

Diamond services have the best protection ability.
When there are enough resources in the network,
Diamond services provide a permanent 1+1 protection &
AS ON /GMP LS b as ed re s to ra tio n . Dia mo n d s e rv ic e s a re
applicable to voice and data services, VIP private
Line, such as Banking, Security and Aviation.




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Diamond Service: Permanent 1+1 Protection

             NMS




                                                                    Working Path
                                                                    Protection Path



 Any change of resource will be indicated on the NMS immediately
 Provide permanent protection for service when network resource is utilizable
 The highest quality private-line solution: 99.9999%




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Diamond Service - 1+1Protection+Restoration


                NMS




                                                                       Working Path
                                                                       Protection Path




    Any change of resource will be indicated on the NMS immediately
    Provide once 50ms protection and multi restoration, Anti multi fiber-failures




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          Diamond Service - 1+1 Protection


             NMS




                                                                    Working Path
                                                                    Protection Path




 Any change of resource will be indicated on the NMS immediately
 Provide 50ms protection for once fiber-failure




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                      GOLD SERVICE


Gold services are applicable to voice and significant
data services. Compared with diamond services, gold
services have greater bandwidth utilization.
When a fiber on the path of a gold service is cut, the
ASON triggers MSP switching to protect the service at
first. If the multiplex section protection fails, The ASON
triggers rerouting to restore the service.



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Gold Service:Virtual Ring
Protection + Restoration
NMS




                                   Virtual Ring
                                   Protection Route
                                   Restoration Route




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                 Gold Service:Virtual Ring
                 Protection + Restoration

   When the first fiber cut happens, virtual ring will perform
    protection(<50ms)

   When the second fiber cut happens to the same virtual ring,
    service will be restored in 2 seconds.

   Provide once 50ms protection and multi restoration, Anti
    multi fiber-failures

    Any change of resource will be indicated on the NMS
    immediately



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                 SILVER SERVICE
Silver services, the revertive time is hundreds of
milliseconds to several seconds. The silver level
Service is suitable for those data or internet services
that have low real-time requirement. Silver services
are also called rerouting services. When an LSP
failure, the ASON triggers rerouting to restore the
service. If there are not enough resources, service
may be interrupted.


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Silver Service: No Dedicated Resource is
                 Needed

        NMS




              Revertible




                                                     original path

                                                     rerouting path




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     Silver Service: No Dedicated Resource is
                      Needed
   When service is fall down, it will be restored to the new route.
    Service rerouting can be set as Revertible or Non-revertible.

   All restoration service can be treat as High or Low priority,
       When resource is limited, High priority service is
    guaranteed to be reroute

    Rerouting can be locked / unlocked.
    Improves the bandwidth utilization dramatically and provide
    controlled networking




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 Silver Service — Pre-Calculating/Preplan Restoration


                             MDS6600

                                                    Preplan path
iManager T2000

                  Rerouting according to the preplan path




                                                                              preplan path

                                                                              original path
                                                                              rerouting path


        Controllable and predictable circuit resource managing



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                 Silver Service — Shared Mesh Restoration
iManager T2000
                           MDS6600                                     shared restoration
                                                                           resource
                     Bandwidth Resource Reserved Path

                                                                            VC4
                 Rerouting according to the reserved path




        1
                             Insure service restoration                                     reserved path
                                100% successfully
                                                                                            original path
                                                                                            rerouting path

        2




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          Silver Service — Shared Mesh
                   Restoration
 •   The pre-defined path will be dispatched to nodes through the
     T2000 after simulating by MDS6600

•The pre-defined path will be dispatched to nodes through the
 T2000 after simulating by MDS6600.

•The overlapped timeslot resources can share by multiple
 reserved routes

•Ensure the success of 100% of rerouting and guarantee the
reliability of rerouting for key services



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            COPPER SERVICE

The copper services are seldom used. Generally,
temporary services, such as the abrupt services in
holidays, are configured as copper services.
Copper services are also called non-protection
services. If an LSP fails, services do not reroute
and are interrupted.




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                        IRON SERVICE

The iron services are also seldom used. Generally, temporary
services are configured as iron services. For example, when service
volume soars, during holidays, the services can be configured as
iron services to fully use the bandwidth resources.




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   “Best Effort” Rerouting When No Many
                              Directions
                                                          Bandwidth availability
                                                          is improved by reusing
                                                          part of the original route




                                                        Other Route


                                                        Original Route




 When there are not so many directions, “Best effort” rerouting can succeed in
  finding a route to go, so that network reliability is enhanced




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Thanks for patiently viewing
 Thanks




                 ALTTC                                         52
               OFC Faculty
                         7/28/2011   Rajesh JTO RTTC Rajpura        52

								
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