This intelligent modem buffer is the ultimate, affordable way to communicate with remote devices. It has all the capabilities of our Unicom 2500 (without the fiber-optic option), and then some. With Modem Manager 1, you’ll never again program a modem or worry about poor phone lines. Its buffer is 32 times the size of the most advanced single-line modems. It handles bidirectional RS485-to-RS232 conversion and it can even be reprogrammed in person or over the phone. Modem Manager 1 is simply the most useful communication accessory ever.