Rohde & Schwarz SMM-K507, User Manual, Page: 38 / 51

I/Q over Ethernet (QSFP+) protocol
R&S
®
SMM-K507
38 User Manual 1179.5718.02 ─ 02
Annex
A I/Q over Ethernet (QSFP+) protocol
● UDP/IP protocol stack .............................................................................................38
● Waveform file transfer ............................................................................................. 42
● ARB upload flow diagram ........................................................................................43
● Waveform upload command sequences .................................................................44
● Using a python script for waveform data transfer ....................................................45
A.1 UDP/IP protocol stack
This chapter provides background information on the protocol stack to transfer I/Q
waveform data over Ethernet.
● Main specifications ..................................................................................................38
● OSI model ............................................................................................................... 39
● I/Q frame and UDP subheader ................................................................................39
● ACK frame ...............................................................................................................40
● Control and data frame types ..................................................................................40
A.1.1 Main specifications
Protocol characteristics
The UDP/IP protocol stack offers the following main characteristics:
●
Protocol: User Datagram Protocol (UDP) with IP version 4 (IPv4)
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IP addresses: Static
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Primary device (client): Host PC with 10G/40G Ethernet network card
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Secondary device: R&S SMM100A
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Endianness: LittleEndian for UDP packet header and payload
Protocol stack specification
The UDP/IP protocol stack is specified as follows:
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At the beginning of the UDP payload, the proprietary I/Q frame header is inserted.
That means that every datagram is one I/Q frame.
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Main frame types: Control frame and data frame
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The client always starts a session with an initial control frame using the command
C_START_SESSION.
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Control frames also initiate or mark the end of every data transfer session.
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Data transfer sessions contain one or more data frames.
UDP/IP protocol stack