====== Time Sensitive Network (TSN) ======
[[dido:public:ra:xapend:xapend.a_glossary:start| Return to Glossary ]]

**Time Sensitive Network (TSN)** is the [[dido:public:ra:xapend:xapend.a_glossary:i:ieee]]
802.1Q defined standard technology to provide deterministic messaging on standard
Ethernet. **TSN** technology is centrally managed and delivers guarantees of delivery
and minimized [[dido:public:ra:xapend:xapend.a_glossary:j:jitter]] using time scheduling for those [[dido:public:ra:xapend:xapend.a_glossary:r:rta]] that require
determinism.

**TSN **is a [[dido:public:ra:xapend:xapend.a_glossary:o:osi]] [[dido:public:ra:xapend:xapend.a_glossary:p:physicallayer]] (i.e., **Layer 2**) technology. The IEEE 802.1Q standards work at OSI Layer 2. **TSN** is
an [[dido:public:ra:xapend:xapend.a_glossary:e:ethernet]] standard, not an [[dido:public:ra:xapend:xapend.a_glossary:i:ip]] standard. The forwarding decisions made
by the **TSN** bridges use the Ethernet header contents, not the [[dido:public:ra:xapend:xapend.a_glossary:i:ipaddr]]. The payloads
of the Ethernet frames can be anything and are not limited to Internet Protocol. This
means that **TSN** can be used in any environment and can carry the payload of any
[[dido:public:ra:xapend:xapend.a_glossary:i:industrial_application]].

**TSN **was developed to enable deterministic communication on standard Ethernet.
The market for deterministic communication is using nonstandard technologies or
nonstandard Ethernet. Prior to the [[dido:public:ra:xapend:xapend.a_glossary:i:ieee_802.1]] **TSN**, standard Ethernet didn’t
have pure [[dido:public:ra:xapend:xapend.a_glossary:p:physicallayer | Layer 2]] deterministic capability.

Deterministic communication is important to multiple industries (for example,
aerospace, automotive, manufacturing, transportation, and utilities). Providing a
means for determinism over standard Ethernet enables new levels of connectivity and
optimization, leading to cost savings for many industries.

As the name suggests, “time” is the primary aspect of **TSN**. **TSN** is a technology
focused on time. **TSN** was developed to provide a way to make sure information
can travel from point **''A''** to point **''B''** in a fixed and predictable amount of time. Being
predictable enables increased efficiency.

There’s an implied requirement for those networking devices implementing **TSN** ([[dido:public:ra:xapend:xapend.a_glossary:e:endpoint]]
devices and [[dido:public:ra:xapend:xapend.a_glossary:b:bridge | Bridges]]) to share a common sense of time. [[dido:public:ra:xapend:xapend.a_glossary:p:ptp]]
is used to maintain a common sense of time. The PTP profiles chosen to work with
**TSN** are [[dido:public:ra:xapend:xapend.b_stds:tech:ieee:802.1as]].

Source: [[https://www.cisco.com/c/dam/en/us/solutions/collateral/industry-solutions/white-paper-c11-738950.pdf ]]


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