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2.5.7 Transmission Network
The sole purpose of the transmission network in Smart City Network is to provide high capacity
connectivity between different Datacenters and POPs where OLTs and other Access Aggregation
equipments are installed. DWDM is the preferred technology with 100G, 40G and 10G Ethernet
carrying Wavelengths. Additionally, DWDM can be deployed in Ring and Mesh to provide
redundancy on Layer‐0.
ODN Network consists of Fiber optic cables, ODFs, Cabinets, Splitters and related accessories. ODN
network is designed to provide Type‐B protected connectivity to the residential subscribers towards
the OLTs at Aggregation and Datacenter Sites. Splitters with 1:32 split ratio are used to provide
80Mbps connectivity to residential subscribers.
OLS (Optical Line Supervisor) systems are deployed to monitor the fiber optic cable. Any fiber cuts
occurring in the ODN Network are immediately identified by the OLS (e.g., N2510) system and field
staff is informed to rectify the faults.
If Customer shows interest in Huawei's ODN Solution then iODN Solution should be presented.
Generally it has been learnt that Network operator's do the design for ODN themselves or via some
3rd party consultants.
Business users are provided P‐to‐P connectivity to provide GE level connectivity on fiber. Redundant
fibers are used to provide protected connectivity.
2.5.8 Network Management System
Open Access Network involves interoperation across carriers and wholesale of triple‐play services.
These scenarios require comprehensive network management and O&M solutions to ensure
network manageability and maintainability. Smooth deployment of wholesale services and rapid
fault locating has become major concerns.
The Network Management system is located at the NE management layer and the network
management layer in the telecommunication management network (TMN). It has all NE‐level and
network‐level management functions. Figure below, shows the positioning of the NM in the TMN.
Figure 48 – Positioning of the NM in the TMN
ITU‐T's Technical Reports and Specifications 283
