att door phone controller 사용자 설명서

LED

When the AT&T Door Phone Controller is powered on and

blink 2.5 times a second. If there is a malfunction the LED will
blink faster than 4 times a second (see Troubleshooting

section) or go out completely. If the LED is not lit, check power

to unit first before calling for repair.

Installation Procedures   2-21