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The Sports Network, conocida por sus siglas TSN, es una empresa que ofrece canales de televisión por suscripción de deportes en Canadá. Fue uno de los primeros canales por suscripción del país y el primero orientado a deportes.
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The Sports Network ( TSN) is a Canadian English language discretionary sports specialty channel owned by CTV Specialty Television, owned jointly by Bell Media (70%) and ESPN Inc. (30%), itself a subsidiary of The Walt Disney Company.
Televisa Networks es la subdivisión de Televisa Internacional que se encarga del diseño, producción, programación, distribución y comercialización de los canales de televisión por suscripción de la empresa, cuya cobertura comprende México, Estados Unidos, Latinoamérica, Europa, África y Asia Pacífico. Fue fundada en 1995, aunque ...
- Background
- Time Synchronization
- Scheduling and Traffic Shaping
- AVB Credit-Based Scheduler
- Enhancements to AVB Scheduling
- TSN Scheduling and Traffic Shaping
- Selection of Communication Paths and Fault-Tolerance
- Current Projects
- External Links
Standard Information technologynetwork equipment has no concept of "time" and cannot provide synchronization and precision timing. Delivering data reliably is more important than delivering within a specific time, so there are no constraints on delay or synchronization precision. Even if the average hop delay is very low, individual delays can be u...
In contrast to standard Ethernet according to IEEE 802.3 and Ethernet bridging according to IEEE 802.1Q, time is very important in TSN networks. For real-time communication with hard, non-negotiable time boundaries for end-to-end transmission latencies, all devices in this network need to have a common time reference and therefore, need to synchron...
Scheduling and traffic shaping allows for the coexistence of different traffic classes with different priorities on the same network - each with different requirements to available bandwidth and end-to-end latency. Traffic shapingrefers to the process of distributing frames/packets evenly in time to smooth out the traffic. Without traffic shaping a...
IEEE 802.1Qav Forwarding and queuing enhancements for time-sensitive streams
IEEE 802.1Qav Forwarding and Queuing Enhancements for Time-Sensitive Streams defines traffic shaping using priority classes, which is based on a simple form of "leaky bucket" credit-based fair queuing. 802.1Qav is designed to reduce buffering in receiving bridges and endpoints. The credit-based shaper defines credits in bits for two separate queues, dedicated to Class A and Class B traffic. Frame transmission is only allowed when credit is non-negative; during transmission the credit decrease...
IEEE 802.1Qat Stream Reservation Protocol
IEEE 802.1Qat Stream Reservation Protocol (SRP) is a distributed peer-to-peer protocol that specifies admission controlsbased on resource requirements of the flow and available network resources. SRP reserves resources and advertises streams from the sender/source (talker) to the receivers/destinations (listeners); it works to satisfy QoS requirements for each stream and guarantee the availability of sufficient network resources along the entire flow transmission path. The traffic streams are...
IEEE 802.1Qcc Enhancements to SRP
SRP uses decentralized registration and reservation procedure, multiple requests can introduce delays for critical traffic. IEEE 802.1Qcc-2018 "Stream Reservation Protocol (SRP) Enhancements and Performance Improvements" amendment reduces the size of reservation messages and redefines timers so they trigger updates only when link state or reservation is changed. To improve TSN administration on large scale networks, each User Network Interface(UNI) provides methods for requesting Layer 2 serv...
IEEE 802.1Qch Cyclic Queuing and Forwarding
While the 802.1Qav FQTSS/CBS works very well with soft real-time traffic, worst-case delays are both hop count and network topology dependent. Pathological topologies introduce delays, so buffer size requirements have to consider network topology. IEEE 802.1Qch Cyclic Queuing and Forwarding (CQF), also known as the Peristaltic Shaper (PS), introduces double buffering which allows bridges to synchronize transmission (frame enqueue/dequeue operations) in a cyclic manner, with bounded latency de...
IEEE 802.1Qci Per-Stream Filtering and Policing
IEEE 802.1Qci Per-Stream Filtering and Policing (PSFP) improves network robustness by filtering individual traffic streams. It prevents traffic overload conditions that may affect bridges and the receiving endpoints due to malfunction or Denial of Service (DoS) attacks.The stream filter uses rule matching to allow frames with specified stream IDs and priority levels and apply policy actions otherwise. All streams are coordinated at their gates, similarly to the 802.1Qch signaling.The flow met...
IEEE 802.1Qbv Enhancements to Traffic Scheduling: Time-Aware Shaper
The IEEE 802.1Qbv time-aware scheduler is designed to separate the communication on the Ethernet network into fixed length, repeating time cycles. Within these cycles, different time slices can be configured that can be assigned to one or several of the eight Ethernet priorities. By doing this, it is possible to grant exclusive use - for a limited time - to the Ethernet transmission medium for those traffic classes that need transmission guarantees and can't be interrupted. The basic concept...
IEEE 802.1Qbv in more detail: Time slices and guard bands
When an Ethernet interface has started the transmission of a frame to the transmission medium, this transmission has to be completely finished before another transmission can take place. This includes the transmission of the CRC32checksum at the end of the frame to ensure a reliable, fault-free transmission. This inherent property of Ethernet networks - again- poses a challenge to the TDMA approach of the IEEE 802.1Qbv scheduler. This is visible in figure 2: Just before the end of time slice...
IEEE 802.3br and 802.1Qbu Interspersing Express Traffic (IET) and Frame Preemption
To further mitigate the negative effects from the guard bands, the IEEE working groups 802.1 and 802.3 have specified the frame pre-emption technology. The two working groups collaborated in this endeavour since the technology required both changes in the Ethernet Media Access Control (MAC) scheme that is under the control of IEEE 802.3, as well as changes in the management mechanisms that are under the control of IEEE 802.1. Due to this fact, frame pre-emption is described in two different s...
IEEE 802.1Qca Path Control and Reservation
IEEE 802.1Qca Path Control and Reservation (PCR) specifies extensions to the Intermediate Station to Intermediate Station(IS-IS) protocol to configure multiple paths in bridged networks. The IEEE 802.1Qca standard uses Shortest Path Bridging (SPB) with a software-defined networking (SDN) hybrid mode - the IS-IS protocol handles basic functions, while the SDN controller manages explicit paths using Path Computation Elements (PCEs) at dedicated server nodes.IEEE 802.1Qca integrates control prot...
IEEE 802.1CB Frame Replication and Elimination for Reliability
IEEE 802.1CB Frame Replication and Elimination for Reliability (FRER) sends duplicate copies of each frame over multiple disjoint paths, to provide proactive seamless redundancy for control applications that cannot tolerate packet losses. The packet replication can use traffic class and path information to minimize network congestion. Each replicated frame has a sequence identification number, used to re-order and merge frames and to discard duplicates. FRER requires centralized configuration...
IEEE 802.1CS Link-Local Registration Protocol
MRP state data for a stream takes 1500 bytes. With additional traffic streams and larger networks, the size of the database proportionally increases and MRP updates between bridge neighbors significantly slow down. The Link-Local Registration Protocol (LRP) is optimized for a larger database size of about 1 Mbyte with efficient replication that allows incremental updates. Unresponsive nodes with stale data are automatically discarded. While MRP is application specific, with each registered ap...
IEEE 802.1Qdd Resource Allocation Protocol
SRP and MSRP are primarily designed for AV applications - their distributed configuration model is limited to Stream Reservation (SR) Classes A and B defined by the Credit-Based Shaper (CBS), whereas IEEE 802.1Qcc includes a more centralized CNC configuration model supporting all new TSN features such as additional shapers, frame preemption, and path redundancy. IEEE P802.1Qdd project updates the distributed configuration model by defining new peer-to-peer Resource Allocation Protocol signali...
IEEE 802.1ABdh Link Layer Discovery Protocol v2
IEEE P802.1ABdh Station and Media Access Control Connectivity Discovery - Support for Multiframe Protocol Data Units (LLDPv2) updates LLDP to support IETF Link State Vector Routing protocoland improve efficiency of protocol messages.
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Televisa Deportes Network (también conocido por sus siglas TDN) fue un canal de televisión especializado en deportes operado por Televisa Networks. Propiedad del Grupo Televisa, fue lanzado al aire el 22 de julio del 2009, cesó transmisiones a las 23:59 del 19 de julio de 2019 y terminó siendo reemplazado a las 00:00 del 20 de julio de 2019 ...
