Trunk Calibration and Conditioning on the NEC SL2100 and SL1100

Calibrating and conditioning your analog CO (POTS) lines can significantly reduce issues related to poor audio quality, echo, or interference. This procedure helps optimize the performance of analog trunks on NEC SL2100 and SL1100 systems

⚠️ Note: This applies to analog phone lines only. It does not apply to SIP trunks.

Benefits of Trunk Calibration

Eliminates potential complications with analog trunks
Reduces line interference
Improves speakerphone quality
Fixes echoing issues

‼️ Important: We strongly recommend calibrating and conditioning each analog CO trunk line during every new installation.

Instructions

Use an idle digital phone connected to the system, with the handset in the cradle. The phone must be connected to the NEC SL2100 or SL1100.

Step-by-Step Procedure

Press the Speaker button, then dial # * # *
Enter the password: 12345678
Press the Hold button
Dial 90 68 01
Dial 01 to begin adjusting Trunk 1
Press the Hold button
The display will run through 5 measurement adjustments
When complete, the screen will display: Copy? (1:Yes)
⚠️ Tip: You can copy trunk parameters from Line 1 to others, but we recommend testing and conditioning each line individually
Press the Menu key to return to trunk selection
Dial 01, then 02 to test Trunk 2
Repeat steps 5–8 for each additional line
After completing all trunks, exit programming
Power down the phone system to apply changes
‼️ Important: A full system reboot is required before further programming can take effect

Once the NEC SL2100 or SL1100 fully reboots, you may continue with any other necessary programming.