What is the types of network Topologies used in WDM design?

[Mohamed.Saeed]

1. WDM network consists of 4 parts

• access
• aggregation
• metro
• backbone

2. Access part where the customer devices connected to the network

3. Aggregation part where the customers traffic combined and aggregated to be transported to the core network together

4. Metro is the MAN part ( metropolitan area network ) and it’s a big area whether the link between the access / aggregation to the long distances backbone network

5. Backbone is the core network part where we have high capacity and large number of connections

6. Types of topologies :

• linear
• star
• mesh
• Ring ( tangent Ring , intersected Ring )

7. For access, most common network topology used is star and linear

8. For aggregation we can use Star topology for combining the leafs ( traffic from customers to one node )

9. For metro we can use ring topology

10. For backbone , we can use mesh network because of ease traffic protection and restoration

11. Choosing network topology in the design phase is not fixed and has no rule , it depends on number of connections , customer devices locations , protection mechanisms needed , distances between sites and other factors , usually use mixed network topology

12. From [product perspective for example we have Nokia PSS 1830 8 / 16 in access and Nokia PSS 16 , 32 in metro and we have Nokia PSS 1830 24x , 36 , 64 in Core network

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