Requested revision
Standard: | IEEE Std 802.1Q-2018 | Clause: | 8.6.8.4 |
Clause title: | Enhancements for scheduled traffic |
Rationale for revision
IEEE Std 802.1Q-2018 page 204, third paragraph from bottom has a sentence,
... if there is insufficient time available to transmit the entirety of
that frame before the next gate-close event ...
It is not stated whether this means the last bit of the CRC, the
end-of-frame marker, or the end of the 802.3 IPG (inter packet gap). It is
clear from other parts of 8.6.8.4 that it is expected that the first bit of
a frame can always be transmitted at the start of a window, but with the
ambiguity in the words "entirety of that frame", the IPG between the last
frame in a window and the first frame of the next window is left
unaccounted for.
Proposed text
Change "entirety of the frame" to "entirety of the frame, including any
inter-frame gap and preamble". There may be better words to use, as this
is an 802.3 term.
Impact on existing networks
This may make existing implementations invalid. We may want to allow an
implementation to use either last bit or last bit + IPG, and add a
read-only managed object to allow the implementation to reveal how it works.
Originator
Name: | Norman Finn | Email: | nfinn@mail01.huawei.com |
Affiliation: | Huawei Technologies Co. Ltd | ||
Submitted: | 2019-01-16 |