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4-14
Chapter 4
Configuring the System
6. Return to the <PSTN Configuration Menu> screen.
Setting up PCM Type
PCM (Pulse Code Modulation) is the most frequently used analog-to-digital encoding (A/D
conversion technique to convert analog voice into digital signal). SMG-3200 provides 2 PCM
types, which are A-law and U-law.
A-law : A-law is an ITU-T (International Telecommunication Union) standard for analog-to-
digital conversion in PCM. A-law is used in most of the telephone networks in
Europe, and similar to U-law used in North America.
-law : -law is an ITU-T (International Telecommunications Union)standard for analog-
to-digital conversion in PCM. -law is used in most of the telephone networks in
North America.
SMG-3200 provides A-law type by default. To use μ-law type, trunk board
and station board such as LOOP, SLC, E&M need to be changed.
Setting up the PCM type of the SMG-3200 using the following directions.