SIM A7670C 4G LTE TTL Modem is a Cat-1 Module which supports wireless communication modes of LTE-TDD/LTE-FDD subsequently. Basically It supports maximum 10Mbps downlink rate and 5Mbps uplink rate.  Generally AT instructions are used to communicate with the A7670C.

The SIM A7670C 4G LTE TTL Modem Board is specifically designed keeping in mind the requirements of the user. It has various pinouts from the module, such as RING – used to detect incoming call, DTR – to use the 4G Module in ultra low power sleep mode, STATUS – to detect the status of 4G Module. NETLIGHT – in case developer wants to use external LED to indicate network status, RESET – developer can use this pin to connect with MCU and reset the module if required. It has onboard UART Logic Level Convertor and works on 5V TTL logic level as well as 3.3V TTL Logic level, By default its 5V TTL Logic level, in order to perform the board on 3.3V TTL Logic level please shift the 0E Resistor from 5V to 3.3V as depicted in the image.

An also be purchased online here: https://www.graylogix.in/product/sim-a7670c-4g-lte-ttl-modem

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