Matrix ETERNITY NE System Manual 187
19. Set the Ringer Impedance as High or Synthesized for the CO port according your country-specific
requirement.
'High' signifies 20Mohm Ringer Impedance. This is the default Ringer Impedance provided on the line side
by the DAA module of the CO port. The DAA Module can provide higher impedance when 'Synthesized'
impedance is selected.
Some countries like Poland, South Africa and Slovenia require higher ring impedance which is achieved by
the DAA module, when Ringer Impedance is set to 'Synthesized' impedance.
Default: 'High' (20Mohm).
20. Set the Ringer Threshold (Vrms) level. This parameter defines the level below which the CO port would
not validate the Ring signal, and the level above which it would validate the Ring signal. Set the Ringer
Threshold to the desired value from the following options:
• 13.5 - 16.5
• 19.35 - 23.65
• 40.5 - 49.5
Default: 13.5 - 16.5 Vrms.
If the CO trunk port you are configuring is located in a “Behind the PBX Application”, configure PPDC. 'Pre-
PSTN Digit Count' or PPDC is the number of digits (dialed by an extension) to be ignored by the system
before toll control check is begun. It is the same as the number.
In Behind the PBX Applications, another PBX may be connected to the ETERNITY NE, with some of its
CO Trunks terminating into the Extension ports of the other PBX, and other trunks being directly
connected to the PSTN.
If the CO Trunk port is directly connected to the PSTN, PPDC must be set to '0'.
For Trunk ports connected to extensions of another PBX, PPDC must be configured as per the number of
digits in the Trunk Access Code defined for that PBX.
If the Trunk Access Code is a single digit, select '1'. If the Trunk Access Code is double or triple digit
number, accordingly select '2' or '3' as PPDC.
To know more about this feature, refer “Behind the PBX Application”.
21. To increase the incoming speech volume level of calls from SIP trunks to this CO trunk, set Rx Gain at SIP
Trunk (dB). Default: 0dB.
22. To increase the outgoing speech volume level of calls from SIP trunks to CO trunks, set Tx Gain at SIP
Trunk (dB). Default: 6dB.
23. To improve the quality of Fax over IP
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, configure Pass Through Fax–Data Gain at SIP Trunk, if you
selected Pass Through Fax as Type of Fax over IP on SIP trunks, and if Pass Through Fax is to be
received on a CO trunk. Select the dB Level for Data Gain. Default: -11 dB.
24. Select the dB Level for Pass Through Fax–Bypass Gain at SIP Trunk. Default: -9 dB.
52. Normally, fax calls require less gain compared to voice calls. However, to improve fax reception, ETERNITY allows the configuring
of gain settings for fax. Fax gain settings consist of Data Gain and Bypass Gain. ETERNITY supports Fax Receive Gain for SIP to
CO Trunks, SIP to Digital Trunk calls as well as SIP to SLT Calls.
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