Work closely with FTTx ODN issue

Work closely with FTTx ODN issue

  Optical distribution network (ODN), the physical fibre and optical devices that distribute signals to users in a telecommunications network.

What is ODN network

What is ODN network

  Actually, in most of the network structure diagram, or fiber network project infrastructure design, we just simply see the ODN characters only. In some fiber telecom document, there was no enough information to describe this detail passive optical distribution system inside, even including our main internet pedia.

FTTX ODN Training Video

Optical Consolidation rack

  The Optical Consolidation Rack (OCR), which also called Racks or Rack Mounted, is designed for use in the exchange for the splicing of network fibres to pre-connectorised cables, for direct connection to the active equipment.

Racks and Rack Mounted

Racks and Rack Mounted

Aggregation Node

  The Aggregation Node (marked in “what is ODN network” picture) is like a concentrator for fibre from the exchange to cabinets and to direct FTTH/P. The rest are simply sub splitters to distribute teh fibre closer to the neighbourhood, ready for fibre to connect to the houses or networks.

Splitter

Module PLC Splitter

Module PLC Splitter

  The Fiber Optic Splitter, also named beam splitter, is based on a quartz substrate of integrated waveguide optical power distribution device, the same as coaxial cable transmission system.

Distribution point

Installation of the fibre-optic cable on high

Installation of the fibre-optic cable on high

  ODN system offers various distribution point in fiber distribution cabinets, fiber management, and optical splitter and so on.

Manifold cables

Manifold cables

Manifold cables

  Generally speaking, fiber optic cable management usually starts from manifolds, duplexers and breakout boxes for fiber optic cable patching and termination.

Manifold jointers

Manifold jointers

Manifold jointers

  The manifolds jointers offer rugged protection and bifurcation of multi-fiber cable into, for example, either 3mm or 5mm Miniflex protection tubing.

Node T system

Fibre optic cable Node T

Fibre optic cable Node T

  A node was inserted somewhere it doesn’t belong.

Blown fiber tubing

Cleaning the ‪‎optical‬ ‪‎fiber‬ core with alcohol

Cleaning the ‪‎optical‬ ‪‎fiber‬ core with alcohol

  Blown fiber tubing, air-blown fibre is a method of installing fibre optic cables that relies on the flow of compressed air easing the fibre all the way to its destination – sometimes 1km away.

Key ideas to follow:

  1. Choosing the appropriate wavelength
    Choosing of the appropriate wavelength

    Choosing of the appropriate wavelength

  2. Using appropriate transceivers ( SFP+ , XFP etc.)
    appropriate transceivers

    appropriate transceivers

  3. Calculate the total ODN loss (transmission loss, insertion loss etc) 
    Optical splitter RatioMaximum insertion loss(dB)Port-insert-loss uniformity(dB)
    1︰2≤4.1≤0.8
    1︰4≤7.4≤0.8
    1︰8≤10.5≤0.8
    1︰16≤13.8≤1.0
    1︰32≤17.1≤1.5
    1︰64≤20.4≤2.0

  Optical loss testing, like multimode fiber, can be affected by many variables.

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