The GPRS mobile phone and the Global Positioning System (GPS) jointly provide real-time scheduling, monitoring and management of vehicles. The current position information of the vehicles detected by the GPS is transmitted by the GPRS mobile phone to the vehicle dispatch center in real time through the GPRS network. The vehicle dispatch center The instructions and commands can also be sent to one or more pilots through point-to-point (PTP) or point-to-multipoint (PTM) methods, which can completely replace the existing wireless cluster command and dispatch system. It has the advantages of low cost, wide coverage, and no special maintenance. Remote dial-in access to a virtual private network (VPN) uses the Layer 2 Tunneling Protocol (L2TP). The mobile user accesses the GGSN that provides the VPN function. The GGSN first authenticates the entered company name through its own Radius server, and then initiates L2TP tunnel negotiation with the company's headquarters router. The RADIUS server at the headquarters and the GGSN performs the tunnel identification (TID). After the authentication, the tunnel between the GGSN and the company headquarters router is established. At this point, the user's Peer-Peer Protocol (PPP) packet can be directly transmitted to the company's headquarters router. The company's headquarters router completes the user-level authentication through the company's Radius server. After passing, it establishes a GPRS mobile phone to reach the corporate headquarters router. PPP links, which truly enable mobile office services. For more information on the Smart Security Products Encyclopedia and Smart Home Control System Encyclopedia , click here!
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