A 32-bit unsigned integer representing the length in octets of the captured packet as received via a network.
Included Length
A 32-bit unsigned integer representing the length of the Packet Data field. This is the number of octets of the
captured packet that are included in this packet record. If the received packet was truncated, the Included
Length field is less than the Original Length field.
Packet Flags
Flags specific to this packet. Currently the following flags are defined:
Bit No.
Definition
0
Direction flag 0 = Sent, 1 = Received
1
Command flag 0 = Data, 1 = Command/Event
2 - 31
Reserved
Table 7.2 - Packet Flag Description
Bit 0 is the least significant bit of the 32-bit word.
Direction is relative to host / DTE. i.e. for Bluetooth controllers, Send is Host->Controller, Receive is Controller-
>Host.
Note: Some Datalink Types already encode some or all of this information within the Packet Data. With these
Datalink Types, these flags should be treated as informational only, and the value in the Packet Data should
take precedence.
Cumulative Drops
A 32-bit unsigned integer representing the number of packets that were lost by the system that created the
packet file between the first packet record in the file and this one. Packets may be lost because of insufficient
resources in the capturing system, or for other reasons.
Note: some implementations lack the ability to count dropped packets. Those implementations may set the
cumulative drops value to zero.
Timestamp Microseconds
A 64-bit signed integer representing the time of packet arrival, in microseconds since midnight, January 1st, 0
AD nominal Gregorian.
In order to avoid leap-day ambiguity in calculations, note that an equivalent epoch may be used of midnight,
January 1st 2000 AD, which is represented in this field as 0x00E03AB44A676000.
Packet Data
Variable-length field holding the packet that was captured, beginning with its datalink header. The Datalink
Type field of the file header can be used to determine how to decode the datalink header. The length of the
Packet Data field is given in the Included Length field.
Note that the length of this field in not necessarily rounded to any particular multi-octet boundary, as might
otherwise be suggested by the diagram.
Data Format
All integer values are stored in "big-endian" order, with the high-order bits first.
7.2.3 Progress Bars
The analyzer uses progress bars to indicate the progress of a number of different processes. Some progress
bars (such as the filtering progress bar) remain visible, while others are hidden.
TELEDYNE LECROY
Chapter 7 General Information
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Frontline BPA low energy Hardware & Software User Manual
Summary of Contents for BPA LOW ENERGY
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