Specifications

System Software Diagnostics Guide — September 2006 91
GCEV_TRACEDATA Reference
18.3 Structure of Data - Tracing ISDN Trunks
Table 2 shows the structure of the data, listing the fields and size of each field. A description of the
fields follows the table.
Following are descriptions of the fields listed in Table 1-3:
Send/Receive Flag
When this field has a value of 01, it indicates a frame sent by the firmware to the network.
When this field has a value of 02, it indicates a frame received by the firmware from the
network.
Timestamp
This field is a 4 byte field (unsigned 32 bit integer) representing the number of firmware timer
ticks since the board was started. Each tick is equivalent to 4 milliseconds. This field is
encoded in the Little Endian format (the least significant byte of the number is stored in the
lowest memory address, and the most significant byte of the number is stored in the highest
memory address).
Payload
This field is a number of bytes representing the event that occurred in the firmware.
18.4 Payload Formats
This section describes the payload formats for CAS and ISDN:
• CAS Payload Formats
• ISDN Payload Format
18.4.1 CAS Payload Formats
The firmware currently supports four data types. This section describes how to decode the payload
field for each data type:
• CAS Data (data type field = 02H)
• R2MF Data (data type field = 04H)
• SigDet ON Data (data type field = 08H)
• SigDet OFF Data (data type field = 10H)
Table 2. Structure of GCEV_TRACEDATA Data for ISDN
Field Size of Field
Send/Receive Flag 4
Timestamp 4
Payload N