What is the characteristics of Junction Optical Networks - Technopediasite


Tuesday, January 1, 2019

What is the characteristics of Junction Optical Networks

Junction Optical Network inside the city
Junction Optical Network Bridge

What is the characteristics of Junction Optical Networks: Junction Optical Networks (JN), also known as Metropolitan networks, geographical scope of Junction Optical Networks is shorter and limited inside a metropolitan region.Junction Optical Networks are the bridge between first-mile infrastructures in urban areas, the Access Networks, and Long-Distance Networks crossing exchanges, cities and country.
I have already mentioned in previous post "Optical Long-Distance Network"
that Telecommunication networks are usually segmented in a three-tier hierarchy: Access Optical Network, Junction Optical Network (Metropolitan), and Long-Distance. Today I will explain the characteristics of Junction Optical Network.If you would to read about the features of Long-Distance Network, open here READ MORE

Main characteristics of Junction Optical Networks

➥Medium distances
The distance covered in Junction Optical Networks vary in practice,its depend upon the company requirements. It can span more than one hundred kilometers and cross a metropolitan area.Junction Optical Networks those optical lines that interconnect Exchanges inside the same city. Generally it stable the interconnection between the exchanges.

➥Access Aggregation and Regional Switching at the same time
Junction Optical Networks aggregates traffic from Access Networks to the core network. Junction nodes are connected with Wavelength Division Multiplexing (WDM) links, with ring topologies more prevalent towards the core and trees towards the access.

Technologies and evolution
Junction Optical Networks have used WDM technologies for delivering wavelength services. WDM/SDH/ONT has also been deployed in Junction Optical Networks but mostly for point-to-point wavelength services.Today OTN is increasing its presence in next generation Junction Optical Networks and evolve from a point-to-point or simply aggregation, to a real switched network layer.

Junction Optical Networks are now seeing pressure for data rates to jump to 100 Gbps.Unlike in the Long-Distance, metro region has more available fiber, and the decision to move from 10 Gbps to 100 Gbps is a combination of bandwidth pressure versus economics. Coexistence of 100-Gbps and 10-Gbps interfaces are expected for a time.

Explosive growth of traffic
Bandwidth pressure will continue to increase as more content caching and application placement move from centralized data centers to distributed data centers closer to the users to improve their user experience.Meanwhile, user access speeds and 
application demands also will continue to increase.

Overlaid on this background of increasing demand, it's clear that virtualization, especially in the context of cloud data centers, is another key accelerating factor in this trend. Aligned with the transfer of content and applications into the metro is the deployment of additional data centers into the metro by cloud providers.

➥Traffic granularity
Junction Networks are often application-specific, being closer to the service origination points, which are diverse, ranging from end-points like digital subscriber line (xDSL), FTTH and mobile base stations.

Metro applications include triple-play aggregation, business Ethernet, mobile backhaul, enterprise lines, and Data Center Interconnection.Each of these applications requires specific capabilities.

As Junction Optical Networks aggregate traffic from such different applications, support for finer granularity signal rates is a requirement as the bit rate of the transported individual channels may be quite different (from 1 Gbps up to 100 Gbps).

Long-Distance Networks require high spectral efficiency and performance, this requirement is often not so stringent for Junction Optical Networks. Cost, power consumption, and footprint are critical factors in such configurations.

Higher density of nodes
Junction Optical networks are shorter in distance, they often possess a larger number of optical nodes. Compared to Long-Distance Networks, the number of nodes is higher.

Optical Transmission Engineering
Distances in Junction Optical Networks are shorter than in Long-Distance Networks, the optical transmission requirements can be still quite challenging with a large number of add-drop multiplexers included in the path.Junction Optical Networks are shorter in distance, the larger number of optical nodes impairs the Optical Reach.

As a transparent pass-through optical node incurs similar performance degradation than the transmission over a fiber span with the same loss, performance requirements for Junction Optical Networks and Long-Distance Networks start to converge.

Junction Optical Network connect the exchanges inside the city. More traffic pressure on Junction Optical Network. More application of Junction Optical Network is in business Ethernet, mobile backhaul, enterprise lines, and Data Center Interconnection. It also play a important role in digital subscriber line (xDSL), FTTH and mobile base stations.


  1. Great Article
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