548 Matrix ETERNITY NE System Manual
Navigation Keys
These are 5 capsense keys. The functions of each are described briefly below.
• Enter Key: To enter the Menu; when the phone is in the idle state (without any incoming or outgoing call 
being made), if you tap the 'Enter' key, you will enter into the 'Menu'.
Enter key is also used to make a selection from the Menu/sub-menu options or to complete an action.
• Up Key: To scroll upwards while navigating the Menu/sub-menu.
• Down Key: To scroll downwards while navigating the Menu/sub-menu.
• Forward Key:  To move forward when dialing a number. 
• Back Key: To move backwards when dialing a number; to go back one level in the Menu. 
Direct Station Selection (DSS) Keys
These are a set of 28 programmable keys assigned to Extensions and Trunks and important or frequently 
accessed features of ETERNITY.
Refer the topic “DSS Keys” for instructions on programming these keys.
DSS Key LEDs
Each DSS key is equipped with an LED which glows to indicate the status of the Trunk/Extension or Feature 
assigned to it. 
• Status of Extensions and Trunks: The LED of DSS keys assigned to Extensions/Trunks glow in three 
colours to indicate status of the call event on the Extensions/Trunks and on the DKP.
Thus, the status of the DKP user's own Extension as well as that of the other Extensions (i.e. DKPs and 
SLTs) and the status of Trunk lines are indicated by the LED of the DSS keys assigned to those 
Extensions and Trunks on the DKP. 
The following table shows the relationship between the colour of the LED and various events: 
LED 
Colour
LED Mode
Continuously ON Slow Blink Fast Blink
Blue  The key assigned to the 
Extension you are in speech 
with.
The key assigned to the 
Extension you have kept on 
hold.
The key assigned to the 
Extension you are calling or 
from which you are being 
called.
Red  The key assigned to the 
Extension that is now busy 
with another Extension/
Trunk.
The key assigned to the 
Extension which has put 
another Extension/Trunk on 
hold.
The key assigned to the 
Extension/Trunk that is called 
or being called by another.
Violet You are talking on a Trunk 
(external call)
You have held a Trunk 
(external call)
You have an incoming call on 
the Trunk (external call)