With the SMPTE 2110 suite of standards largely published and the related AMWA IS-04 and -05 specifications stable, people’s minds are turning to how to implement all these standards bringing them together into a complete working system.
The JT-NM TR-1001-1 is a technical recommendation document which describes a way of documenting how the system will work – for instance how do new devices on the network start up? How do they know what PTP domain is in use on the network?
John Mailhot starts by giving an overview of the standards and documents available, showing which ones are published and which are still in progress. He then looks at each of them in turn to summarise its use on the network and how it fits in to the system as a whole.
Once the groundwork is laid, we see how the JT-NM working group have looked at 5 major behaviours and what they have recommended for making them work in a scalable way. These cover things like DNS discovery, automated multicast address allocation and other considerations.
John Mailhot from Imagine Communications discusses what ‘Full Stack’ means for video over IP. The SMPTE 2110 suite of standards is mainly about the transport of essences – but how to you simply plug in some equipment and get going? You need standards which discover and register the new device, you need timing to synchronise devices. It’s a whole ecosystem.
John walks us through the data flows (and workflows) necessary when you plug new 2110 kit in and we quickly discover there is more depth than we imagined.
John also discusses how DHCP can give you more than just IP addresses.
Covering IS-04, IS-05, PTP/SMPTE 2059, ST 2110 and IEE 802.1AB (LLDP). This is a very practical video. Why? Because understanding all this is key to diagnosis and troubleshooting.
John Mailhot explains throughput and latency in switches and discusses live SDI switching in IP, subscription and control using NMOS 5 and 6. John then takes some time to discuss what ‘good enough’ is for switching time given SDI also has a delay.
Finishing up with network topology and interoperability, this is a great look into some of the details of dealing with 2110.
The SMPTE 2110 family of essence networking protocols is based on multicast flows in the IP network. IGMP (Internet Group Multicast Protocol) is the typical method for endpoints to subscribe to the streams they want, and to leave the streams they no longer require. Concerns have been raised in the industry about the suitability of IGMP for this task, and the applicability of SDN techniques as an alternative means to managing group memberships. Speed of switching signals is a particular concern.