The T1 CSU ACE is a compact, full-featured T1 channel service unit used to connect T1 data terminal equipment (DTE) and T1 facilities. The unit is designed to provide alarms, loopbacks, signal regeneration, line build out, and surge protection. The unit is suitable for wall mounting or desktop use. Five LEDs on the front of the unit (POWER, NET LOS, EQ LOS, NET LB, and EQ LB) display the status of the unit.