Endace Measurement Systems Limited
http://www.endace.com
EDM01.05-04r1 DAG 3.6GE User Manual
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27
Revision 7. 22 September 2005.
6.0 DATA FORMATS OVERVIEW
In this chapter
This chapter covers the following sections of information.
•
Data Formats
•
Timestamps
6.1 Data Formats
Description
The DAG card uses the ERF Type 2 Ethernet Variable Length Record.
Timestamps are in little-endian [Pentium native] byte order. All other
fields are in big-endian [network] byte order. All payload data is captured
as a byte stream, no byte re-ordering is applied.
Table
Table 7-1 shows the generic variable length record.
timestamp
timestamp
type flags
rlen
lctr wlen
(rlen - 16) bytes of record
Table 7-1. Generic Variable Length Record.
Data format
The following is an overview of the data format used.
Data Format
Description
type:
This field contains an enumeration of the frame
subtype. If the type is zero, then this is a legacy
format.
0: TYPE_LEGACY
1: TYPE_HDLC_POS: PoS w/HDLC framing
2: TYPE_ETH: Ethernet
3: TYPE_ATM: ATM Cell
4: TYPE_AAL5: reassembled AAL5 frame
5: TYPE_MC_HDLC: Multi-channel HDLC
frame
6: TYPE_MC_RAW: Multi-channel Raw link
data
7: TYPE_MC_ATM: Multi-channel ATM Cell
Continued on next page
