1.First of all

SMPTE ST 2110 Professional Media Over Managed IP Networks (hereinafter referred to as SMPTE 2110 or ST2110) is an SMPTE standard that is an evolving set of standards for communicating professional video such as broadcasting over IP networks. With the standardization of this standard, the industry is transitioning from SDI-based to IP-based transmission. Macnica develops and provides FPGA/Software solutions such as the "SMPTE ST2110 FPGA IP Core" that allow customers to easily implement this standard.

This time we will explain the structure of the SMPTE 2110 standard.

2. About SMPTE 2110 Suite

A major feature of SMPTE 2110 is that each essence of Media Data​ ​(Video, Audio, and Metadata) is transmitted as separate synchronized streams. There is another standard for IP transmission, SMPTE ST 2022-6, but ST 2022-6 does not separate each essence and handles the entire SDI essence as one stream.

SMPTE 2110 is divided into standards for the entire system and standards for each essence. The set of standards that form the basis of SMPTE 2110 are called the SMPTE ST 2110 Suite of Standards.

●Network Timing Reference
◎ ST2110-10 : System Timing and Definitions
● RTP Mapping Reference
◎ ST2110-20 : Uncompressed Active Video
◎ ST2110-30 : PCM Digital Audio
◎ ST2110-31 : AES3 Transparent Transport
◎ ST2110-40 : Transport of SMPTE Ancillary Data
● Sender Behavior Reference
◎ ST2110-21 : Traffic Shaping and Delivery for Video

A brief summary of the main points of each standard is as follows.

● ST2110-10
◎ Defines the entire ST2110 system, timing model and requirements common to all essence streams
◆ Requirements for PTP
◆ Regulation of RTP clock and time stamp
◆ SDP requirements common to all essences
◆ UDP datagram size

● ST2110-20
◎ Regulations for Uncompressed Active Video Data transmitted by the ST2110 system
◆ RTP format specification for Uncompressed Active Video Data
◆ SDP requirements when using ST2110-20
◎ ST2110-20 assumes transmission of the following video formats.
◆ Width x Height of Image
- Up to 32767 x 32767
◆ Sample Components
- Y'C'BC'R, Y'CC'BCC'RC, ICTCP, RGB, R'B'G', X'Y'Z', RP 157 key signals
◆ Chroma sampling
- 4:4:4 and 4:2:2, 4:2:0
◆ Bit Depth
- 8-bit, 10-bit, 12-bit, 16-bit

●ST2110-30
◎ Specification of PCM Digital Audio (AES67 compatible) transmitted by ST2110 system
◆ PCM Digital Audio RTP format specification
◆ SDP requirements when using ST2110-30
◆ Rules for channel order of multi-channel audio groups
◆ Regulation of the standard compliance level
- What number of channels, sampling frequency and packet time are supported

● ST2110-31
◎ RFC 8866 for AES3 Signal transmission in ST2110 system
◆ AES3 Signal RTP format specification
◆ SDP requirements when using ST2110-31
◆Regulation of standard compliance level

●ST2110-40
◎ Specification of SMPTE ST 291 Ancillary (ANC) Data Packet transmitted by ST2110 system
◆ RTP format specification for ANC Data Packet
◆ SDP requirements when using ST2110-31

Here, I will give a supplementary explanation of the keywords "RTP" and "SDP" that appeared above.

● RTP
RTP stands for Real-time Transport Protocol, and is a protocol used for data that requires real-time performance, such as video and audio.
All essences of ST2110 use RTP. RTP is typically sent over the network in a UDP payload.
RTP is specified in RFC 3550.

● SDP
SDP stands for Session Description Protocol, and is a protocol used to transmit media information when transmitting streaming video.
SDP is a text-based protocol that describes the type of media (Video, Audio, etc.),
Transport protocol information (RTP, UDP, IP, address, etc.), media format (for Video, the above-mentioned Video format, etc.), etc.
will be listed. SDP is specified in RFC 8866.

When the ST2110 standard was first established, mutual conversion between SDI-based transmission and IP-based transmission was assumed to be the main standard. In fact, many of the terms used in SDI are used in the ST2110 standard. At present, there are plans to add Essence standards that are not directly related to SDI, and the future ST2110 standard will not only replace SDI with IP, but will also serve as a foundation for flexible new solutions that apply network technology and infrastructure. I think that it will develop and expand into a new standard.

That said, the broadcast industry is currently in the process of making the switch from SDI-based to IP-based transport. Next time, I would like to talk a little more practically about IP transmission.

To the product [Media Over IP Package] page

Media Over IP Package is a packaged product of ST2110 hardware IP / software development kit / reference design.

Related information links

Please also refer to the technical information page regarding IPMX.

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