In Northern Ireland, a toll booth and plaza on the M1 between Dublin and Belfast is automated at night; hence an intruder alarm system was needed for protection. The distance between the toll booth and plaza is 6.2 kilometers and the security systems – Vanderbilt’s SPC, and video cameras – had to be able to connect and operate over that distance for operators to have an overview of each site.
SPC replaced a legacy product that had the IFS fiber drivers connected and working on multi-mode fibre over the 6.2 kilometres. Due to this distance, the fibre driver was bespoke. Multimode is usually only specified for about two kilometers. However, when the 3GS legacy system was replaced for a new SPC panel, the communication over the fibre link stopped working.
The installation company, Precision Security, previously had to deploy a pair of fibre cables – two transmitters and two receivers – to transmit the signal back and forth. However, in updating the site, they found that a single pair of ComNet fiber units, from the box, could execute the task, despite only being specified for 4.5 kilometers.
The ComNet FDX60 multimode fibre units allowed the SPC X-Bus transmission to be converted from RS485 protocols to optical and back to RS485. This enabled the data between the SPC expanders to travel further distances.
The ComNet FDX60 (M,S)[-M] data transceivers provide point-to-point transmission of simplex or duplex EIA RS232/RS422/RS485 (2W/4W) data signals over one or two optical fibers. The transceivers are transparent to data encoding, allowing for broad-range compatibility. Models within this series are available for use with multimode or single mode optical fiber.
Victor Fields of Precision Security, who installed the fiber solution on site, said: “ComNet came straight out of the box and was easy to use and to install. Its threshold is only around four kilometers, but it is working well beyond that. When I saw the name ComNet, I was pretty confident that it would work, to be honest. We previously worked with ComNet fiber managed switches, and we found that they always work as a sweet as a nut.”
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