VITA-49 Radio Transport Protocol
The value of the New Sweep Start ID field shall use the 32-bit unsigned integer format
shown in
Table 25:
New Sweep Start ID Field Format
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
New Sweep Start ID
IF Data Packet Class
The IF Data Packet Class conveys digitized IF Data from the digitizer to devices external
to the WSA5000. The payload data and its output format is dependent on the RFE
modes of operation (
). In addition to
), the following
describes the output data width and packing method for
the different data type in order comply with VRT's 32-bit word output format:
Table
26: Output Data Width and Packing Method for Different Data Formats
Original Data
Format
Binary Format Per
Data Component
Signed
Extension
Per 32-bit Word
Packing Method
{I
14
Q
14
}
Signed 2-complement
{I
16
Q
16
}
{I
16
Q
16
}
{I
14
}
Signed 2-complement
{I
16
}
{I
1
16
I
2
16
}
{I
24
}
Signed 2-complement
{I
32
}
{I
32
}
The different Stream Identifier values will be used to indicate these different formats.
The order of the fields in an IF Data packet is organized as shown in
. Packets
is transmitted in big-endian byte order.
Table 27:
IF Data Class Field Values
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Pkt Type
C T
-
TSI TSF Pkt Count
Pkt Size
Stream Identifier (1 word)
Timestamp - Integer Seconds (1 word)
Timestamp - Integer Picoseconds (2 words)
Data Payload (Variable Size)
Trailer (1 word)
1.
Pkt Type
shall be
0001
, indicating that a stream identifier is present.
2.
C
shall be set to
0
, indicating that there is no class identifier present.
3.
T
shall be set to
1
, indicating there is a trailer word in the packet.
4.
TSI
field shall be set to
01
, indicating that integer (seconds) part of the timestamps
are in UTC.
5.
TSF
field shall be set to
10
, indicating that the fractional part of the timestamp
measures in real time picosecond resolution.
6.
Pkt Count
shall start at 0000, and be incremented once for each IF Data packet
that is received, until reaching 1111, when it then wraps back to 0000 on the next
count.
7.
Pkt Size
shall be the number of 32-bit words that are present in the packet,
including all headers, data payload and trailer if included.
8.
Stream Identifier
shall have the values as shown in the following
ThinkRF WSA5000 Wireless Signal Analyzer Programmer's Guide
37