"Senders implementing this standard shall signal a Format Specific Parameter SSN with the value ST2110-40:2018 unless they are signaling Format Specific Parameter TM, in which case they shall signal the value ST2110-40:2021."
There is no ST2110-40:2021. This needs to be corrected to state: "...in which case they shall signal the value ST2110-40:2023"
Clause 7 states:
"Senders implementing this standard shall signal a Format Specific Parameter SSN with the value ST2110-40:2018 unless they are signaling Format Specific Parameter TM, in which case they shall signal the value ST2110-40:2021."
There is no ST2110-40:2021. This needs to be corrected to state: "...in which case they shall signal the value ST2110-40:2023"