4.14.14. L2_TRACE (Layer 2 Access Flag)

Parameter Number: 0x09

Description: The L2_TRACE parameter is the ISDN Layer 2 access flag. When Layer 2 (Data Link layer) access is disabled, ISDN Link Access Protocol for the D channel (LAPD) functionality is obtained by accessing ISDN Call Control and Layer 3 (Network layer). When Layer 2 access is enabled, call control is no longer supported for the channels on this line and ISDN LAPD functionality is obtained by accessing Layer 2 directly.

Values:

• 0 = Disable Layer 2 access
• 1 = Enable Layer 2 access

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