We work closely with all the leading players in the transportation market: operators, manufacturers and system integrators. In a sector where security and availability are critical, we offer innovative products, ranging from Hirschmann™ industrial switches and active devices to Belden® cabling, connectivity and cable management products. This portfolio is combined with an unmatched range of services, from engineering to maintenance. Customers throughout the industry rely on Belden to provide a range of solutions that meet their most advanced requirements.
Take a more in-depth look at our transportation solutions:
The Belden product portfolio is designed to meet the uncompromising safety and reliability requirements of the transportation industry. From Ethernet switching products with best in class reliability to cabling with certifications against fire and smoke standards and transport rated EMC connectors, Belden is able to provide your network system as a fully integrated solution, compliant with your exacting requirements.
Whether implemented through fiber or copper, a Belden supplied network solution can be designed to provide data rates for the future, thus eliminating the need for any upgrades to cope with the system innovations in the future.
In a sector where domain knowledge is vital, we offer an innovative dedicated product portfolio which has a proven track record within the industry.
As one of the world‘s leading providers of network, cabling and connectivity solutions, Belden is able to provide your network system with a fully integrated solution, compliant with your exacting requirements.
In addition to our industry-specific portfolio, we offer an unmatched range of services, from engineering to maintenance and support. By choosing Belden you are selecting an experienced partner who has the Industry knowledge to help you achieve your goals.
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.
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