Like urban public transport as IC CARDS, these CARDS to the public transportsystem, each card key encryption to have control of the factory.
就象城市公共交通IC卡一样，这些卡在交给公交系统使用前，每张卡的密钥都要进行出厂加密控制。
2
The public transport intelligent management system is such a system with application of advanced techniques of information, electronic control, GPS and computer network.
It is not a single but a system integrated with several technologies constructing communication network, including Signaling Protocol, Voice Codec, Media Transport and Gateway Control.