Rohde & Schwarz SMM-K507, Руководство пользователя, Страница: 39 / 51

I/Q over Ethernet (QSFP+) protocol
R&S
®
SMM-K507
39 User Manual 1179.5718.02 ─ 02
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The header of the I/Q classifies the frame type used in the I/Q frame.
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A waveform consists of one or more waveform segments.
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The segment length is a multiple of 512 bytes. If a segment is shorter, missing
bytes are added to the payload (padding).
A.1.2 OSI model
OSI layer Classification Description
5 Application (level 1) "ARB Upload" protocol String based, e.g. for transmission
of waveform parameter.
4 Application (level 0) "SigGen - I/Q over Ethernet" pro-
tocol Proprietary Rohde & Schwarz
protocol used for upload
3 Network / transport UDP/IP -
2 Data link Ethernet, IEEE802.3 -
1 Physical QSFP+ (10GbE, 40GbE) Optical or copper
A.1.3 I/Q frame and UDP subheader
The I/Q frame carries 64-bit information divided into six frame fields. Figure A-1 dis-
plays the frame composition and Table A-1 describes frame field bit information.
Figure A-1: I/Q frame or UDP subheader
Table A-1: Bit number and I/Q frame or UDP subheader fields
Bit number I/Q frame or UDP subheader fields
[0:15] Flow control counter (0 to 65535)
Restart with zero every time.
[16:23] Coder instance
[24:29] Payload definition code
Cmd code/data format
[30:31] Frame type
0: Ctrl frame | 1: Data frame | 2: Not defined | 3: Idle frame
[32:47] Payload size (byte)
Except for subheader.
[48:63] Protocol version / reserved
UDP/IP protocol stack