“How we solved fiber deficiency, increased robustness and saved 55% in equipment costs ”
Wexnet is one of Sweden's largest open city networks that started in 1995 in Växjö.
Number of customers: Approx. 26,000
Services: Capacity services and black fiber
Network type: Cisco-based
More resilient network
More free fiber pairs
55% fewer distribution switches
56% fewer distribution nodes
37% fewer ports
Opportunity to offer wavelength as
Possibility to make distribution nodes completely passive (not electricity or cooling)
What challenges did Wexnet face?
When a city network grows, sooner or later you are faced with problems with fiber shortages on popular routes. The solution is often costly and time consuming as it is associated with digging and fiber blowing. Here they were faced with the challenge of one cost-effective way to be able to solve the shortage that existed both in the city center but also in the backbone network that connects the towns with each other.
They also wanted to increase the robustness in the network and especially in the distribution nodes where the factors that affect (safe power and cold) are crucial to be able to provide high availability. With more number of distribution nodes also comes more number of UPSs and cooling systems that are expensive both in purchase and maintenance.
With geographically dispersed distribution nodes with a varied number of connected access rings, it also becomes natural to have a certain port waste in the form of unused ports in the distribution switches. A lower gate utilization rate inevitably leads to a higher one costs in the distribution warehouse than compared to if it had been possible to approach one 100% port utilization, which Wexnet aimed for.
Traffic growth is also happening exponentially and therefore a clear way forward was needed to know how to scale up the capacity in the network in an efficient way.
“The competence and innovation was the biggest advantage of Miradot and theirs
WDM solution. Miradot stands for innovation at a reasonable cost. We have needed for a long time start with WDM technology but everyone who has presented solutions has been for cost-driving. That solved Miradot. They managed to catch our attention
by linking technology to efficiency that could be measured in money. ”
The solution Wexnet chose to implement is based on a unique way of using wavelength technology in distribution and access networks. By Miradot together with Wexnet being able to analyze the existing network design, Miradot was then able to develop a tailor-made design for the wavelength technology without it entailing any logically topological changes in the active network. The design meant that node types and equipment were standardized in a way that entails expansion in a predefined and simple way. This effectively avoids the challenges regarding both documentation and operation that arise in a network with non-standard design.
To ensure that Wexnet itself maintains control and competence, Miradot conducts training on site. “We have had two training opportunities and need more given that we are expanding our staff. We are happy to take the training from Miradot, who are happy to share their skills. The equipment is very stable, so we do not get the opportunity to learn at troubleshooting times. ”
The wavelength technology itself is based on DWDM (Dense Wavelength-Division Multiplexing) and in our design enables you to use a black fiber pair for up to 40 links instead of traditionally a single link. The technology itself is proven and is usually used in larger operators' long-distance networks and backbone networks. This is usually associated with high costs and complexity, but which Miradot makes available in a simplified and cost-effective way.
With the introduction of Miradot's WDM solution, Wexnet has now begun work to reduce the number of active distribution nodes from 18 to 8 and thus be able to dismantle UPS and cooling systems and still follow PTS / SSnF node classification (AD). At the same time, you will go from 40 distribution routers to 18. The performance of the passive network has been unchanged - you experience the same quality as with black fiber. The performance of the active network gradually increases as you upgrade to 10Gbps. The only disadvantage experienced so far is that the WDM technology places demands on dual-fiber where it has previously been possible to use single-fiber, but since it also increases the number of possible links to 40 per fiber pair and it was a foreseeable consequence, it has not caused any problems. .
Is the solution future-proof?
- Yes, both in terms of MTBF and we believe in the solution so much that we continue to expand the solution with more passive DWDM equipment. Faster way to solve fiber shortages at the pace we are expanding the network right now, says Håkan Larsson, Development Manager at Wexnet.
Has the solution been difficult to handle and how have your technicians received the technology?
- No, not the operational equipment. When our own competence is not enough when expanding the wavelength network, we take help from Miradot. Our technicians have received the technology in a very positive way.
How do you feel that design, support and implementation help have worked?
- Top notch, nothing to complain about!
Would you recommend Miradot's WDM solution to anyone?
- We ourselves are city networks and warmly recommend other city networks to contact Miradot, who can scale up an existing network in the best way. No need to guarantee an upcoming procurement of new equipment as we did, but can still be more efficient.