Telex KP-812 User Manual page 28

Flashing Red Talk LED
There is an incoming call from the destination assigned to the key. Activate the key to talk back.
Note: The duration of incoming call flash is controlled by DIP switch 4 on the KP-812 keypanels. See
Option Switch Settings , for further information.
Amber Talk LED (on time less than off time)
This indicates that a key is ready to talk (key is on), but requires external footswitch activation to talk
or the key has been selected but the handset is still on the receiver.
Listen LED Indication
Each button is back lit with a bi-color LED as an indicator. The listen LED is the button above the
display panel.