olved from the Audio Video Bridging (AVB) TG and SO some of its standards still contain elements of that history. The principal charter of the TSN Task Group is to develop support for deterministic services to be transported over IEEE 802 networks. Deterministic means it has a guaranteed, predictable level of performance with accurate timing, bounded (low) latency, low Packet Delay Variation (PDV), and low packet loss. These deterministic characteristics are very important to multiple industries, in- cluding aerospace, automotive, manufacturing, transportation, utilities, 5G mobile front-haul net- works, and SO forth. TSN is a collective name for a set of standards. It is more like a toolbox for the network designer to pick what is needed within the network for their targeted application. The key standards for TSN includes the following: IEEE Std 802.1Q-2018: Bridges and Bridged Networks (specifies Dot1q VLAN tags on IEEE 802.3 Ethernet networks) IEEE Std 802.1AB-2016: Station and Media Access Control Connectivity Discovery (specifies the Link Layer Discovery Protocol [LLDP]) IEEE Std 802.1AS-2020: Timing and Synchronization for Time-Sensitive Applications (spe- cifies a PTP profile) IEEE Std 802.1AX-2020: Link Aggregation Groups (known as LAG groups) IEEE Std 802.1CB-2017: Frame Replication and Elimination for Reliability Many times, TSN develops amendments to one of the base 802.1 standards that eventually get rolled into updates to the base standards-as is the case with the 802.1Q VLAN specification. Sub- sequent versions of the larger standard incorporate many standalone documents that were originally published separately. Because there are SO many technologies and options available to apply to a specific problem area, the TSN TG has introduced the concept of TSN profiles (not to be confused with PTP profiles). TSN profiles can be categorized based on the industry where they apply (a "P" in front of the stand- ard identifier means it is an ongoing project): IEEE 802.1BA-2011: TSN for Audio Video Bridging Syst