Matrix NAVAN CNX200, Системное руководство

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450 Matrix NAVAN CNX200 System Manual
The NAVAN supports the fax options: T.38 (UDPTL) , T.38 (RTP) , and Pass Through . Default: T.38
(UDPTL).
• 'Pass Through' and 'T.38' will work only if the peer devices also support the same option.
• If you select 'Pass through' as Fax type, you must clear 'Silence Suppression'.
• If the fax sent using T.38 is rejected, NAVAN will use Pass Through for sending the Fax.
T.38 Fax Parameters
If you select T.38 protocol as Fax Type, you may configure Eye Quality Monitor (EQM) related parameters to
improve quality of Fax. The higher the EQM, the better the Fax quality. To improve the quality of T.38 fax reception,
1.
Select the T.38 Fax Version for the desired SIP Trunk as per your requirement. Default: 0. You can
configure the Fax Version from 0 to 2.
2.
Set the Max Rate (Kbps) to the desired speed. Default: 14.4 kbps.
The Max Rate controls the Fax image transfer speed. As EQM is inversely proportional to fax Max Rate, if
you receive poor quality fax, the Max Rate should be reduced.
3.
Set the Packet Period (msec) to the desired value. Default: 40msec.
The packet period 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.
4.
Set the Image Redundancy Level to the desired value. The Fax Image Level is redundancy level for
output Image, which can be from 0 to 3. Default: 1.
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, good quality fax
can be achieved.
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.