ADTRAN solutions maximize performance, lower costs, and help companies achieve the best return on investment. ADTRAN is committed to achieving success for customers by offering "best-in-class" products with outstanding value. Let ADTRAN work for you.PRODUCT FEATURES:MX2820 MUX Card (+/-24V);Supports FLASH download data available from SCU;Provides near and far end DS3 PM;Detects DS3 alarm and loopback conditions;Monitors DS3 line conditions, sends alarms to SCU;Local or network timing modes;1: 1 equipment redundancy on DS3 and DS1;Hot swappable.