As BT withdraw the legacy leased circuits that have traditionally been used for communications
to traffic signals, UTC managers are increasingly replacing them with wireless networks using
iMesh™ uses only open standards - both for client access and backhaul. Not only does this
assist integration with other systems but also eliminates the risks associated with deploying
Not only does iMesh™ offer substantial revenue savings over legacy BT circuits, it also
provides the opportunity to integrate other functions such as CCTV, remote wireless vehicle
detection and other UTMC-compliant systems such as parking guidance signs and counters.
One iMesh™ router is required at each node in a network (for example, in a controller cabinet or up a signal pole). Backhaul
links (using fibre, ADSL or IDT’s i3G™ router) provide the connections from the on-street network to the UTC instation.
Click image to enlarge
Although we have some links operating reliably in excess of 800m, iMesh™ has a typical operating range of 200-300m per hop and supports multiple hops. As iMesh™ is simultaneously both an access point and a network client it can be deployed as a repeater. For example, on a street lighting column where there is no requirement for a local connection to an OTU.
Ad hoc re-routing
In the event of a node outage (for example, when a pole gets knocked down), iMesh™ routers will automatically find an alternative route to the backhaul (assuming one exists). In May 2012 we received the following text in an email from one of our customers (please contact us if you want verification).
For your information, due to signal modifications at xx Rd/Red Car Park exit, the mains supply to the controller (and mesh router) has been switched off. However, the mesh system re-routed and the only transmission fault logged by UTC was on the node that was powered down.
iMesh™ delivers reliable connectivity for the latest UTC systems from Imtech and Siemens. All of the leading traffic signals maintenance companies have experience installing and maintaining iMesh™ (with personnel trained by IDT).
iMesh™ is a true mesh network in that it operates as a peer-to-peer network - all roadside nodes operate independently with no need for some kind of centralised control. However, some customers asked us for a monitoring application that would give them a real-time indication of the operational status of the network. iMeshManager was the result.
- Wireless Security
- WPA, WPA2 Authentication
- MAC Address Access Control
- VPN (SSL & IPsec)
- Hidden SSID
- Netfilter - rule-based, multizone firewalling with NAT and masquerade
- Port forwarding
- Reserved bandwidth and priority by application or IP address
- LAN port
- 2-port Ethernet auto-switching
- WAN port
- 1-port Ethernet auto-switching
- Serial port
- For future expansion
- 246 x 225 x 45 mm (width x depth x height)
- 0.8 Kg
- 220Vac or Power over Ethernet
- -30 to +70°C, 5 – 95% RH
- IP54 (cabinet mounting)
- IP67 (external-mounting) with integral 15dBi directional antenna