opal

http://www.lifehacker.com.au/2014/02/how-to-network-enable-a-bus/

Deployment How To Network-Enable A Bus - Angus Kidman

If you want to build a smart transport system, you need to ensure that every single vehicle in the fleet is permanently connected to the network. How do you do that when you’re dealing with a constantly moving, rattling bus?

Netcomm Wireless has been dealing with that problem recently. It’s supplying the on-bus 3G Wi-Fi routers for Sydney’s Opal transport smartcard, which is supposed to catch NSW up to the rest of the nation by actually introducing a work on-train smartcard. (Yes, Melbourne, we know Myki is unpleasant, but at least you don’t have an entire abandoned project on the state books the way NSW does with the T-Card.)

As part of a supply contract with Opal’s main developer Cubic Transportation Systems to fit out 5000 Sydney buses, NetComm had to customise one of its existing designs. Many of the features on the router would be recognisable in most networking contexts: it has eight on-board ports, and can switch between using Telstra’s 3G networks when on the road and Wi-Fi signal when in maintenance areas. But it also required some changes.

“We’ve specialised the device so that it copes with vehicles being turned on and off which can cause spikes and currents in the available power,” NetComm Wireless’s Danny Morrison told Lifehacker. “It’s also vibration-proof.”

The onboard memory also had to be expanded so that details of transactions can be stored. While Opal card details are supposed to be updated immediately, a failover system was needed if 3G wasn’t available. If there’s a problem, customers can still tap on and off the bus, with the data forwarded when the connection is restored.

The other key challenge is to ensure that the devices and network are secured. The router itself runs an open Linux platform and uses existing standards, so regular security approaches definitely play a role. However, Cubic has added its own layer of security to minimise the risk of hacks. “We haven’t locked this in any proprietary way, but Cubic have applied additional security to the device and added encryption as well,” Morrison said.

The bus rollout is currently half-completed (though only two routes in Sydney are active), and scheduled to finish by the end of 2014.