EDM01-09v7 DAG 3.8S Card User Guide
©2005
41
Version 9: May 2006
Chapter 7: Data Formats Overview
In this chapter
This chapter covers the following sections of information.
•
Data Formats
•
Time Stamps
7.1 Data Formats
Description
The DAG 3.8S card uses the ERF types 1 and 3 timestamps. 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.
timestamp
timestamp
type:1
flags
rlen
lctr
wlen
HDLC Header
(rlen - 20) bytes of packet
Table 7-1. Type 1 PoS HDLC 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
Summary of Contents for DAG 3.8S
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