Matrix ETERNITY NE System Manual 181
• Configure the Profile Number. See “Call Back on Trunk Ports” for instructions.
• Click Submit to save your profile.
• Close the window. 
Hardware Features
1. Click [+] Hardware Features to expand. 
2. Select your Trunk Type. Three types of CO trunks can be interfaced to a CO port of the ETERNITY NE: 
• Normal Dial type: This is the conventional CO available from the PSTN. 
• Hotline type: The CO connecting two destinations immediately on grabbing the trunk. 
• Hotline Dial type: A special CO available from the PSTN, which works as a normal dial type for some 
time and works as a hotline thereafter.
Default: Normal.
3. Select AC Termination Impedance. The AC Termination Impedance of the CO port must match with the 
AC Termination Impedance supported by the PSTN network. By default, the AC Termination Impedance is 
set as per the “Region” you have selected; however, you may select the impedance supported by your 
PSTN network from the following options. 
• 600 
• 900 
• 270+(750 || 150 nF) and 275+(780 || 150 nF)
• 220+(820 || 120 nF) and 220+(820 || 115 nF)
• 370+(620 || 310 nF)
• 320+(1050 || 230 nF)
Default: 600 ohms (for default Region ‘India’)