Requested revision
Standard: | IEEE Std 802.1AS-2020 | Clause: | 11.4.2.6, A.7 |
Clause title: | correctionField, Minimal time-aware system |
Rationale for revision
In Table 11-6, first row after the header, the sentence: “Corrections for fractional nanoseconds (see 10.2.9 and Figure 10-5), difference between preciseOriginTimestamp field (if sent by a two-step PTP Port) or originTimestamp field (if sent by a one-step PTP Port) and current synchronized time (see 11.2.15.2.3 and Figure 11-7), and asymmetry corrections (see 8.3, 11.2.14.2.1, and 11.2.15.2.3; the quantity delayAsymmetry is used in the computation of upstreamTxTime in 11.2.14.2.1, and upstreamTxTime is used in computing an addition to the correctionField in 11.2.15.2.3).” is not clear. The word “corrections” after “asymmetry” is not needed because “corrections” is already contained in the subject of the sentence, and the parenthetic expression at the end of the sentence would be easier to parse if it were broken into two sentences. Also, in MINTA-10 of A.7, the sentence “If path delay asymmetry is modeled by this PTP Instance does it comply with the requirements of 8.3?” is not clear; a comma is needed after “Instance”. Also, in the first row of Table 11-6 after the header, first column, a comma is needed after Follow_Up.
Proposed text
(1) Replace the sentence in the first row after the header, second column of Table 11-6, by: “Corrections for fractional nanoseconds (see 10.2.9 and Figure 10-5), difference between preciseOriginTimestamp field (if sent by a two-step PTP Port) or originTimestamp field (if sent by a one-step PTP Port) and current synchronized time (see 11.2.15.2.3 and Figure 11-7), and asymmetry (see 8.3, 11.2.14.2.1, and 11.2.15.2.3. The quantity delayAsymmetry is used in the computation of upstreamTxTime in 11.2.14.2.1, and upstreamTxTime is used in computing an addition to the correctionField in 11.2.15.2.3).” (2) Replace the sentence of MINTA-10 of A.7 by “If path delay asymmetry is modeled by this PTP Instance, does it comply with the requirements of 8.3?” (3) In the first row of Table 11-6 after the header, first column, add a comma after “Follow_Up”.
Impact on existing networks
These are editorial corrections, and there is no impact on existing networks.
Originator
Name: | Geoffrey M. Garner | Email: | gmgarner@alum.mit.edu <mailto:gmgarner@alum.mit.edu> |
Affiliation: | Huawei (Consultant) | ||
Submitted: | 2020-10-29 |