Aspire Clipping Analog Trunk Calls - NEC Aspire S Manual

Section 3: Installing Extensions and Trunks

Aspire Clipping Analog Trunk Calls

Some customers may be experiencing problems with analog trunk calls on the Aspire S systems being
clipped. The Aspire speakerphone switching results in clipping/chopping when making/receiving external
calls with analog trunk-based systems. This is caused by apparent "hot" trunks. If overall volume levels of
dial tone are found to be extremely loud, this can cause the speaker area of the phone to vibrate. In addition,
high sidetone levels when using the handset can cause a problem. Both of these conditions result in an
imbalance of the switching between the handsfree microphone and speaker.
To resolve the clipping/chopping problem on analog trunk calls perform each of the following steps -
one at a time - trying the next step only if the problem still occurs.
●
Set the following programs back to the default entries for all analog trunks:
Program 14-01-02 : Basic Trunk Data Setup - Transmit CODEC Gain Type
Program 14-01-03 : Basic Trunk Data Setup - Receive CODEC Gain Type
Program 81-07-01 : CODEC Filter Setup for Analog Trunk Ports
(Program 81-07-01 may take up to 20 seconds before the change takes affect.)
● Adjust Program 81-07-01 : CODEC Filter Setup for Analog Trunk Ports to make the trunk side
tone the minimum for all analog trunks. Usually, an entry of "1" or "0" would have the best result, but
the final setting may vary for each trunk.
● In Program 14-01-02 : Basic Trunk Data Setup - Transmit CODEC Gain Type and Program 14-
01-03 : Basic Trunk Data Setup - Receive CODEC Gain Type
analog trunk transmit and receive gains to reflect a -5dB reduction. The entry in each program should
be changed from the default setting of 32 (0dB) to 22 (-5dB). This programming change is required on
a trunk by trunk basis and the value may vary for each trunk as the setting may be too low for some
trunks. New settings will not take affect until the trunks become idle.
With these changes,
1. Dial tone volume levels appear more normal with little affect on the maximum volume settings.
2. Speakerphone switching becomes properly balanced with no clipping/chopping present.
3. Sidetone levels in the handset appear normal.
If, after performing the above steps, the problem still exists, please contact NEC Field Engineering for
further investigation.
Should you be experiencing a squealing or howling-related feedback problem when making a handsfree
intercom call, refer to Aspire Keyset Speakerphone Problems When Used with Analog Trunks (page 3-
19). After following the recommendations on page 3-19, update the system software to version 4.01 or
higher. If the problem still exists, please contact NEC Field Engineering for further investigation.
3-22 ◆ Section 3: Installing Extensions and Trunks
= 32
= 32
= 2
, change the default values for the
Aspire S Hardware Manual