Internal block diagram of the MAX7221
There are 16 registers inside the MAX7221, 8 of which are data registers and the rest are control registers. The MAX7221 receives 16 bits of data at a time, in the following format.
MAX7221 receive data format
The WIFI hotspot, including the internal data processing and transmission of the CPE, is divided into two completely independent channels. The internal network channel carries WIFI, is managed by the user, and is authenticated by the account password. The external network channel is controlled and controlled by the operator. Two-way authentication, remote monitoring, encrypted transmission, dynamic passwords, strict isolation measures on software and some hardware, to achieve carrier-class security standards, to achieve complete isolation from inside and outside WIFI, external network channels authenticate users through SIM cards, all of the operators Users can access the CPE through the external network to access the 4G / 5G network through the CPE to achieve carrier-class security and achieve standby Internet calls through the external network channel, which is no different from accessing the network through the operator`s base station.
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