Traffic Systems

Well-engineered surveillance systems give you an added margin of safety. Belden products are found along highways, in tunnels and in city centers. These applications require long service life at extreme temperatures, fanless cooling and redundant functionality.


High network reliability in the transport environment

In transportation, networks need to operate efficiently in a harsh environment that requires special performance and a high degree of resilience. Belden industrial products are designed to operate in humid conditions, in high and low temperatures, small spaces, meeting highest standards for redundancy, reliability, data security and long distances.
Belden transportation network solutions ensure reliability and performance in this critical infrastructure.

Compliant with standards, enhancing efficiency

High configurability of products ensures that we can always offer a solution that best meets the needs of the transportation market. In fact, Belden products are designed to meet all major standards in industrial ethernet including: IEEE 1588 compliance for precision time protocol (PTPv2), the IEEE 802.3af/at for PoE and PoE+, the IEEE 802.11n for fast roaming and high bandwidth wireless solutions, the IEC 62439 standard redundancy protocols (MRP,PRP, HSR), IEC 62351-6 for Data and Communication Security or the IEC 61850 for substation automation and protection.

Cyber network protection increases availability and safety

In transportation, data and communication networks are mission-critical infrastructures, which are increasingly at risk of possible attacks or intrusions. Security threats generally consist of attacks against assets but can also undermine the safety of persons. Cyber data security is a vital element of a transportation system’s reliability, maintaining availability of systems and safety of human beings. Belden provides state-of-the-art security for all infrastructure networks and offers a full range of unique products and solutions that meet even the most demanding security requirements.

Customized products

Around the world, leading transportation providers depend on Belden products to help them maximize their performance. Belden always delivers the right products, standard or customized.

Outstanding quality

Quality management is a living part of Belden. We maintain first-rate quality standards by continuously refining our processes, meeting demands for quality networking solutions that exceed even the most rigorous industry standards.

Intensive project pre- and after sales support

We support customers, deliver and maintain our products anywhere in the world. Supported by our Competence Center and a strong network of global partners, we can design and install complete communication networks for all possible mission-critical applications in Transportation.

Sharing knowledge within international standard committees

As a market leader, Belden plays an active role in many standardization organizations and key industry associations such as IEC, IEEE, ODVA, PNO, EPSG.

Highest performance combined with lowest environmental impact

Belden EMEA is committed to being an environmentally responsible company. As such, we seek to minimize the environmental impact of our organization’s activities and operations, and we support our customers’ drive for greener and more sustainable solutions by focusing on reducing the ecological impact of our products.

How many switches can be put in an MRP or RSTP ring?

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.

What are the recovery times of HSR (best case and worst case)?

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.

Are HSR/PRP standardized technologies or are they proprietary?

Both HSR and PRP are specified in the International Standard IEC 62439-3. HSR and PRP are therefore standardized and not proprietary technologies.

If HSR and PRP are superior to MRP or RSTP, why should I continue to use them? Why shouldn’t I switch over to HSR/PRP completely?

While HSR and PRP are superior to MRP or RSTP in terms of reconfiguration performance, there are also drawbacks to the technology:

  • PRP: Requires a complete network infrastructure for both networks, which usually means double the costs for network equipment.
  • PRP and HSR: For both PRP and HSR, hardware support through FPGAs or ASICs is required, leading to higher device costs.
  • HSR: Compared to an MRP ring or RSTP in ring configuration, HSR carries only 50% of the traffic (available bandwidth is halved due to doubled frame transmission).

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.

If HSR/PRP is a standardized technology, why should I buy an HSR/PRP device from Hirschmann? Other vendors will provide the same redundancy functionality?

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:

  • Hirschmann was instrumental in the development of the PRP/HSR standard. With Hirschmann products, a customer can be absolutely sure that the device will satisfy every requirement HSR/PRP was designed to accommodate and that, thanks to our detailed insight knowledge, the implementation is of high performance and absolutely 100% standard conformant.
  • A high performance redundancy is almost useless without proper monitoring and fault detection. Hirschmann HSR/PRP switch products will be integrated into our state-of-the-art SCADA tool Industrial HiVision, which adds up to a combined redundancy and network solution that no competitor can match.

What are the typical application fields of PRP and HSR?

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.

How many HSR ring devices are supported?

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.

Are HSR and PRP future-proof technologies? What is the technological outlook?

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.