Accessing Different LTE Networks Using Dual SIM Cards
As shown in Figure 12-10, the headquarters and branch of an enterprise are located in different places. Router is the egress gateway of the branch and connects to the headquarters through an LTE network (LTE network 1).
To improve data transmission reliability of the LTE link, the branch uses an LTE cellular interface supporting dual SIM cards. One SIM card functions as the master SIM card to connect to LTE network 1, the other SIM card functions as the backup SIM card to connect to LTE network 2. If dial-up fails because the account balance of the master SIM card is insufficient, the master SIM card is faulty, the LTE link signal quality is poor, or the connected LTE network is faulty, traffic is automatically switched to the backup SIM card, ensuring uninterrupted enterprise services.