In IP networks multicast flow subscription is usually based on a combination of IGMP (Internet Group Management Protocol) and PIM (Protocol Independent Multicast) protocols. While PIM allows for very efficient delivery of IP multicast data, it doesn’t provide bandwidth control or device authorisation.
To solve these issues on SMPTE ST 2110 professional media networks the NMOS IS-06 specification has been developed. It relies on a Software-Defined Networking, where traffic management application embedded in each single switch or router is replaced by a centralised Network Controller. This controller manages and monitors the whole network environment, making it bandwidth aware.
NMOS IS-06 specification provides a vendor agnostic Northbound interface from Network Controller to Broadcast Controller. IS-06 in conjunction with IS-04 (Discovery and Registration) and IS-05 (NMOS Device Connection Management) allows Broadcast Controller to automatically set up media flows between endpoints on the network, reserve bandwidth for flows and enforce network security. Broadcast Controller is also able to request network topology information from Network Controller, which can be used to create a user friendly graphic representation of the flows in the network.
In this presentation Rob Porter from Sony Europe explains the basics of NMOS IS-06, showing in details how setting up media flows with this specification fits into the IS-04 / IS-05 workflow. Rob emphasise that all AMWA NMOS specifications are completely open and available to anyone, allowing for interoperability between broadcast and network devices from different manufacturers.
The next speaker, Sachin Vishwarupe from Cisco Systems, focuses on the future works on IS-06, including provisioning feedback (such as insufficient bandwidth, no route available from sender to receiver or no management connectivity), flow statistics, security and grouping (similar to ”salvo” in SDI world).
There is also a discussion on extension of IS-06 specification for Network Address Translation (NAT), which would help to resolve problems caused by address conflicts e.g. when sharing resources between facilities.
Adoption of SMPTE’s 2110 suite if standards for transport of professional media is increasing with broadcasters increasingly choosing it for use within their broadcast facility. Andy Rayner takes the stage at SMPTE 2019 to discuss the work being undertaken to manage using ST 2110 between facilities. In order to do this, he looks at how to manage the data out of the facility, the potential use of JPEG-XS, timing and control.
Long established practices of using path protection and FEC are already catered for with ST 2022-7 for seamless path protection and ST 2022-5. New to 2110 is the ability to send the separate essences bundled together in a virtual trunk. This has the benefit of avoiding streams being split up during transport and hence potentially suffering different delays. It also helps with FEC efficiency and allows transport of other types of traffic.
Timing is key for ST 2110 which is why it natively uses Precision Timing Protocol, PTP which has been formalised for use in broadcast under ST 2059. Andy highlights the problem of reconciling timing at the far end but also the ‘missed opportunity’ that the timing will usually get regenerated therefore the time of media ingest is lost. This may change over the next year.
The creation of ST 2110-22 includes, for the first time, compressed media into ST 2110. Andy mentions that JPEG XS can be used – and is already being deployed. Control is the next topic with Andy focussing on the secure sharing of NMOS IS-04 & 05 between facilities covering registration, control and the security needed.
The talk ends with questions on FEC Latency, RIST and potential downsides of GRE trunking.
French broadcast company M6 Group has recently moved to an all-IP workflow, employing the SMPTE ST 2110 suite of standards for professional media delivery over IP networks. The two main playout channels and MCR have been already upgraded and the next few channels will be transitioned to the new core soon.
The M6 system comprises equipment from five different vendors (Evertz, Tektronix, Harmonic, Ross and TSL), all managed and controlled using the AMWA NMOS IS-04 and IS-05 specifications. Such interoperability is an inherent feature of SMPTE ST 2110 suite of standards allowing customers to focus on the operational workflows and flexibility that IP brings them. Centralised management and configuration of the system is provided through web interfaces which also allows for easy and automated addition of a new equipment.
Thanks to Software Defined Orchestration and intuitive touch screen interfaces information such as source paths, link bandwidth / status, and device details can be quickly accessed via a web GUI. As the system is based on IP network, it is possible to come in and out of fabric numerous times without the same costs implications that you would have in the SDI world. Every point of the signal chain can be easily visualised which enables broadcast engineers to maintain and configure the system with ease.
The Networked Media Open Specifications (NMOS) have been developed to provide a control and management layer along side the SMPTE ST 2110 transport layer. The idea behind NMOS was to deliver an open specification to provide the software layers that abstract a lot of complexities of ST 2110 and make it easy to interface with any control system.
The NMOS family of specifications began with projects for Discovery & Registration, Device Connection Management and Network Control, but has grown to include many other important subjects such as Event & Tally, Audio Channel Mapping and Interoperable Security.
In this video, Jed Deame discusses the latest advancements including IS-08, IS-09, BCP-002, BCP-003 and IS-10. These additions allows NMOS to surpass the level of control provided in SDI while also adding a layer of security.
The following Interface Specifications and Best Current Practices are presented:
IS-04 (Registration and Discovery) – new features: support for GPI over Ethernet (IS-07) and authorisation signalling for security layers BCP-003-02
IS-05 (Connection Management) – new features: MQ Telemetry Transport and WebSocket Transport, support for supplementary externally defined parameters