AT&T MERLIN LEGEND Installation & Maintenance Manual page 226

Installation
Test the MLX Telephones with an
M F M
Test a MLX telephone with an MFM installed and configured for a
T/R adapter. Follow these steps to check the proper channel
operation and the MFM circuitry for the TTR, the ring generator,
and the message LED:
1. Connect a known working 2500-type single-line telephone
with a message light to the MFM adapter. The 2500 telephone
must also have a mechanical ringer.
Pick up the handset on the 2500 telephone and dial ∗09 after
2.
receiving the dial tone.
You should receive another dial tone.
3. Press any button to deactivate the test tone.
Dial the following sequence of numbers: 123456789∗0# and
4.
press the switchhook quickly.
You should receive a confirmation tone.
Hang up.
5.
The CU should send a ring burst, and the message LED on
the 2500 telephone should go on.
6. Turn off the message LED by dialing the appropriate code
number.
Test the Telephones for Intercom
Dial Tone
Follow these steps to test for intercom dial tone:
1. Press the Intercom or System Access button (depending on
the mode of operation).
The red LED next to this button should go on.
2. Press the Speaker button.
3-118 System Acceptance Test