ESK Automation showcased its stall at the UMTE 2017 from 11 – 13 October 2017 – The third edition of the Urban Mass Transit Expo (MTE 2015) – an Exhibition and Conference focusing on Metro + Light Rail was held concurrently with IREE 2017, bringing the Railways and Metro sectors under one roof – making it more convenient for the stakeholders to explore new products, technologies and services available for both sectors. The conference provided a one of its kind platform for all stakeholders in this segment to take advantage of the business opportunities in this fast growing segment in India.
Solution that we showcased
Live Demo: Zero Millisecond Changeover time with zero packet data loss
Although a fast MRP ring can now cover a very large number of requirements, there are still applications that cannot tolerate any switchover time at all. To fulfill such requirements we need to take an entirely new approach to the question of guaranteed high availability. The basis of this new approach to network redundancy is to have two independent active paths between two devices. The sender uses two independent network interfaces that transmit the same data simultaneously. The redundancy monitoring protocol then makes sure that the recipient uses only the first data packet and discards the second. If only one packet is received, the recipient knows that a failure has occurred on the other path. This principle is employed by the parallel redundancy protocol (PRP), which is described in the IEC 62439-3 standard. PRP uses two independent networks with any topology and is not limited to ring networks. The two independent parallel networks may be MRP rings, RSTP networks and even networks without any redundancy at all. The principal advantage of PRP is its interruption-free switchovers, which take no time at all to switch over in failure situations and thus offer the highest possible availability. Naturally this applies only provided both networks do not fail simultaneously.