At night time, the toll system is automated and therefore an intruder alarm system was needed for protection. The distance between the toll booth and plaza is 6.2 kilometres and the security systems – SPC and video cameras – had to be able to connect and operate over that distance so operators could get an overview of activity at each site.
SPC replaced an existing Europlex legacy product that had the IFS fibre drivers connected and working on multimode fibre over the 6.2 kilometre distance. Due to this distance, the fibre driver was bespoke. Multimode is usually only specified for approximately two kilometres. 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 successfully. However, in updating the site, they found that a single pair of ComNet fibre units, straight from the box, could successfully execute the task, despite only being specified for 4.5 kilometres.
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.
“ComNet came straight out of the box and was easy to use and to install. Its threshold is only around four kilometres, but it is working well beyond that,” stated Victor Fields of Precision Security, who installed the fibre solution on site.