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SpectraLink Corporation Link WTS Installation and Operation
Part Number: 72-0075-01-C-W.doc Page 41
11.2 Change Companding
The factory setting on the Link 150 M3 MCU is compatible with Mu-law companding
(signal compression), which is the standard used by most PBXs in North America.
Systems outside North America generally use A-law companding. If the PBX
companding is incompatible with the MCU's, the Wireless Telephones will have distorted
or hissing dial tone and voice will be unintelligible.
• Before you begin, if the system has more than one MCU, erase the configurations
from all MCUs except MCU 1. Refer to 8.5 Replace an MCU for instructions.
To change the default from Mu- to A-law on the Link 150 M3 MCU follow these steps.
1. Power the system OFF.
2. Slide the mode switch on the first MCU to the ADMIN position.
3. Power the system ON. Status LEDs 2, 3, and 4 will be solid green.
4. Press the STEP button once. Status LEDs 2, and 5 will be lit.
5. If the LED for LINE 1 is lit, the system is set for Mu-law.
If the LED for LINE 2 is lit, the system is set for A-law.
6. Press the DEL/ENTER button to toggle between Mu-law and A-law.
7. When the correct LINE LED is lit, return the mode switch to the NORM position.