Matrix ETERNITY NE, System Manual

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142 Matrix ETERNITY NE System Manual
Receiving good quality Fax over IP depends on high 'Eye Quality Monitor' (EQM). The higher the Eye
Quality Monitor, the better the Fax quality. To improve the quality of T.38 fax reception, do the following:
• Set the Max Rate (kbps) to: 2.4, 4.8, 7.2, 9.6,12, or 14.4.
This parameter controls the Fax image transfer speed. As EQM is inversely proportional to Fax Max
Rate, if you receive poor quality fax, the Fax Max Rate should be reduced. Default: 14.4 kbps.
• Set the Packet Period (msec) to: 5, 10, 15, 20, 25, 30, 35, or 40. Default: 40.
This parameter sets the sampling rate of TDM signal. If you cannot improve fax quality by lowering Fax
Max Rate, you may reduce the Fax Packet Period.
When you reduce the Fax Packet Period, the fax image will be sent at lower speed. EQM is inversely
proportional to Fax Packet Period.
Do not change the default settings unless it is required.
• Set Image Redundancy Level to: None, 1, 2, or 3. Default: 1.
The Image Redundancy Level is redundancy level for output Image, which can be from 0 to 3.
Fax Image transfer speed is inversely proportional to this parameter. If this parameter is low then fax is
transferred faster. EQM is directly proportional to this parameter. If this parameter is high, you will
receive good quality fax.
You may increase the Fax Image Level from 1 to 3 if the quality of fax does not improve with Fax Max
Rate and Fax Packet Period.
Level 0 means no redundancy.
• Set Data Redundancy Level to: None, 1, 2, 3, 4, 5, 6, or 7. Default: 3.
This is a redundancy level for T.30 control data. Fax Data Level can be set from 0 to 7. Level 0 means
no redundancy. Redundancy level increases from 1 towards 7. The higher the level set, the slower
would be the fax transmission.
EQM is directly proportional to this parameter. The higher the Fax Data Redundancy Level, the better
the EQM.
17.
Adjust Gain Settings , if required, to increase or decrease the incoming and outgoing volume level of calls
from SIP Digital Trunks/Extension voice calls.
• Set Rx Gain for SIP to Digital Trunk/DKP Voice call (dB) from -31 to 31 dB, if required, to increase
incoming speech volume level of calls from SIP trunks to Digital Trunks/Extension. Default: 0.
• Set Tx Gain for SIP to Digital Trunk/DKP Voice call (dB) from -31 to 31 dB, if required, to increase
outgoing speech volume level of calls from SIP trunks to Digital Trunks/Extension. Default: 0.
• You can also set the Rx and Tx Gains for SIP to Analog Trunks and Extensions (CO trunks and SLT).
• To increase Rx and Tx Gain for SIP to CO trunks, go to " “CO Trunks” ".
• To increase Rx and Tx Gain for SIP to SLT extensions, go to “SLT Extensions” .