An analog modem is a technology that enables data transmission over standard telephone voice channels [1]. It uses frequency band transmission and converts digital signals into analog signals to adapt to analog channel transmission [2-3]. Its peak speed is limited by the voice channel bandwidth (4kHz) and noise level specified by ITU-T, with a maximum speed of up to 56Kbps. Due to the utilization of existing twisted-pair telephone lines and the lack of the need to change the “last mile” technology, this technology is cost-effective and spreads rapidly. With technological advancements, ADSL has broken through the speed limit by expanding the use of bandwidth, and passive optical fiber networks (PON) have become the future development direction due to their higher capacity [1].