5 LED IndicationsThe status of the unit is indicated by the condition of the two LEDs shown in thetable below:A BStatus ① Status LED（Green)② Call Button LED（White)Out of service (OUS) *1 OFF OFFIn Service (INS) *2 ON ONIn Operating *3 ON ⇒ OFF ON ⇒ Blink (Slow)Cancel Button ispressed.*4 OFF ⇒ ON Blink (Slow) ⇒ ONOne Touch Button ispressed. *5 ON ⇒ OFF ON*1 The power of the unit is off, the PBX is not connected or an unsupportedPBX is connected.*2 The unit is ready to use. (Standby status)*3 On calling or in conversation.*4 The unit finishes the operation and returns to standby status.*5 One Touch Button is assigned to three Flexible Buttons.5 LED Indications11

Panasonic KX-DTU100 Quick Reference Manual