Europe relies on rail as efficient transportation mode and expects that a great percentage of medium distance intercity passenger and freight travel will shift from road to rail in the next years.
Belden dedicated communication infrastructure meets the requirements of critical assets as signaling and modern train stations, helping to increase reliability and safety, necessary to allow the increase of passengers and freight traffic and maximize the available railway infrastructure. Railways achieve a greater efficiency of its systems, an increased cost effectiveness and a focus on environmentally friendly aspects, so to be considered the best transport mode.
Quality achieved by modern IP technology, the always larger bandwidth connections, both wired and wireless, and further improving reliability and performances of the devices, enable railway operators to control and monitor an increasing number of systems from remote centers. This availability of technology, of which Belden is a leader, allows to implement new safety systems, reduce maintenance costs and increase the efficiency of the rail network, providing better services to users.
A network in the railway world means operating in a harsh environment that requires special performance and a high degree of resilience. Conditions of humidity and temperature, small spaces, needs for redundancy, reliability, data security and long distances are just few examples of requests that are met with Belden industrial products.
An industrial type of network resolves the various issues of designing the data transmission network and thus ensuring reliability and performance of systems serving critical infrastructure.
Railways need "ready to run“ systems that meet the different requirements of the individual countries along the international routes as well as complying with the restrictive regulatory requirements. IRIS has set the standard for these global rail business requests. Its main objective is to improve the quality in the rail sector by reduction of efforts and costs. Belden with its IRIS certification can offer competitiveness and proved solutions that meet the high quality of standards required from the railways operators.
Leading actors in transportation world trust the Belden products which have been deeply implemented in their systems and applications to help them to maximize their performances by offering them always the right customized range of products.
The quality management system is a living part of Belden. Belden maintains its first-rate quality standard by continuously refining its processes and in this way meets the most rigorous demands for quality with networking solutions that exceed industry standards. The IRIS certification label proves that Belden's Hirschmann™ brand is an approved specialist partner for highly available data communication solutions on trains and along railroad tracks.
Customers can expect our ability to support, deliver and maintain our products anywhere in the world. Our competence center and a strong presence of global partners, design and install a complete communication network for all the possible mission-critical applications in the world of transportation.
Belden as a market leader plays an active role in many standardization organizations and key industry associations as a member of IEC, IEEE, ODVA, PNO, EPSG, UNIFE.
Belden EMEA is committed to operating as an environmentally responsible company. In addition to seeking to minimize the environmental impact of our organization’s activities and operations, we support our customers’ drive for greener and more sustainable solutions by focusing on reducing the ecological impact of our products.
Copies of detailed test results as required for certification against external standards are not held on our publically accessible internet site. If you would like to see copies of these test results for a specific reason, please contact either your local Sales Representative, or firstname.lastname@example.org
MRP: 50+. Switches based on ring topology. Recovery time is almost independent of the number of switches in the ring
RSTP: up to 40 Switches for any type of topology. Because RSTP works in a hop-by-hop principle, recovery time will almost linearly increase with the number of switches in the ring.
There is no best or worst case recovery time for HSR, since there is no recovery time at all. The network recovery time from no fault to a single fault in a ring will always be zero. Also, the repair operation from one fault to no fault is also with zero switchover time.
HSR, as MRP or RSTP in ring configuration, can only sustain one fault in the ring network. This is due to the physical topology, not due to the redundancy protocol. Rings that are coupled via Quad Boxes do not share the same redundancy domain. Therefore, each individual ring can sustain a single fault.
Both HSR and PRP are specified in the International Standard IEC 62439-3. HSR and PRP are therefore standardized and not proprietary technologies.
While HSR and PRP are superior to MRP or RSTP in terms of reconfiguration performance, there are also drawbacks to the technology:
Where seamless redundancy is not explicitly needed, the use of MRP (with SubRings) or RSTP technology may be more cost-effective than HSR/PRP. But where the application requirements justify the additional costs, PRP/HSR can be utilized.
There are several answers to this question. It is true that the technology is standardized, but there are several key factors why a customer should buy a Hirschmann HSR/PRP device:
HSR and PRP were conceived for use in IEC 61850 substation automation, where network reconfiguration times cannot be tolerated, especially on the process bus with sampled values traffic. However, PRP/HSR can also be used in factory automation, especially as redundancy solutions for motion control applications.
In short, PRP/HSR can be used anywhere when only very low to zero network recovery times can be tolerated. This is especially true in time synchronized networks, e.g. with IEEE 1588v2. HSR in particular with its ring structure and cut-through switching, can also provide very low end-to-end latency on ring networks.
The total number of HSR devices in one ring should be limited to 50. This is mainly to reduce the latency in the ring. For very time-critical applications it may be necessary to limit the number of devices even to a smaller number. Another limitation for the number of devices in a ring can be the size of the duplicate detection table inside the device. This is dependent on the implementation.
The IEC standard (IEC 62439-3) for HSR and PRP is now stable and the feasibility of the technology has been shown. HSR and PRP are highly future-proof thanks to the direct integration into the IEC 61850 standard and the acceptance of all major energy automation companies. HSR/PRP technology is expected to be successful in other application fields as well, in particular factory automation. The technology is scalable in line speed (Gigabit speed is scheduled as future improvement to the standard) and can be flexibly adapted to incorporate other technologies, e.g. 1588v2 time synchronization.