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Hand Held ISDN Tester—User Guide
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Understanding the Debug output
The Debug format for the protocol decode is normally only
used for detailed analysis by Agilent Technologies engineers. It
consists of a hex printout of any transmitted or received
messages, plus additional information about the messages
(primitives) which are passed between the OSI Layers, internal
entities and the line at each end of the link. The layers are
labelled as follows:
MMI User interface
CC Call control
CCP X.25 call control
L3 Layer 3
P3 Packet layer
L2 Layer 2
L2D HDLC controller
L1 Layer 1
ME Management entity
The example below shows three lines of Debug output:
L2 ME 5 MDL_ERR_IND Error Code =G
L2 L3 5 DL_REL_IND Ces=1
L3 CC 99 NL_REL_IND Ces=1
• Column 1 is the source of the primitive.
• Column 2 is the destination of the primitive.
• Column 3 is the state number within the state
machine of the primitive source before it is sent.
• Column 4 is the OSI primitive itself. These are
described in the ISDN Layer 3 specification (Q931),
apart from those relating to the user interface
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