IEEE Std 802.1Qbv-2015 pdf free download – IEEE Standard for Local and metropolitan area networks— Bridges and Bridged Networks Amendment 25: Enhancements for Scheduled Traffic.
3. Definitions
Insert the following definitions in alphabetice order, rernumbering as appropriate, and reunmber the subsequent terms accondingly:
3.1 gate close event: An event that occurs when the tasmission gate asciated with a queue transitions
from the Open state to the Closed state. disconecting the tasmission selection function of the forwarding process fom the queue and preventing it from selecting frames from that queue.
3.2 gate-open event: An event that occurs when the transmission gate associated with a queue transitions from the Closed state 10 the Open suale, conecting the transmission selection fumction of the forwarding process to a queue and allowing it to select framcs from that queuc.
3.3 gating eydle: The period of time over which the sequence of operations in a gate control list repeats.
3.4 transmission gate: A gate that connects or disconects the transmission selection function of the
forwarding process from the queue, allow ing or preventing it from selecting frames from that queue. The gate has two states, Open and Closed.
4. Abbreviations
Insert the following abbreviations in alphabetic order:
PTP IEEE 1588™ precision time protocol
TAI Temps Atomic International—International Atomic Time
5. Conformance
5.4 VLAN Bridge component requirements
5.4.1 VLAN Bridge component options
Insert the following items at the end of the lettered list, renumbering as necessary:
ac) Support the enhancements for scheduled traffic as specified in 8.6.8.4;
ad) Support the management entities for scheduled traffic as specified in 12.29.
5.13 MAC Bridge component requirements
5.13.1 MAC Bridge component options
Insert the following items at the end of the lettered list, renumbering as necessary:
l) Support the enhancements for scheduled traffic as specified in 8.6.8.4;
m) Support the state machines for scheduled traffic as specified in 8.6.9.
5.24 EVB station requirements
Insert the following new subclause after 5.24.1.2, at the end of Clause 5:
5.25 End station requirements — enhancements for scheduled traffic
An end station implementation that conforms to the provisions of this standard for enhancements for scheduled traffic shall:
a) Support the enhancements for scheduled traffic as specified in 8.6.8.4.
b) Support the state machines for scheduled traffic as specified in 8.6.9.
6. Support of the MAC Service
6.5 Quality of service (QoS) maintenance
6.5.2 Frame loss
Insert a new list item b8) at the end of the numbered list:
8) The Bridge supports enhancements for scheduled traffic (8.6.8.4) and the size of the service data unit exceeds the value of queueMaxSDU (8.6.8.4) for the traffic class queue on which the frame is to be queued.
8. Principles of bridge operation
8.6 The Forwarding Process
8.6.6 Queuing frames
Delete the fourth paragraph of 8.6.6 as shown:
8.6.8 Transmission selection
Change the first paragraph of 8.6.8 as shown:
For each Port, frames are selected for transmission on the basis of the traffic classes that the Port supports and the operation of the transmission selection algorithms supported by the corresponding queues on that Port. For a given Port and supported value of traffic class, frames are selected from the corresponding queue for transmission if and only if
Insert a new paragraph at the end of 8.6.8 as shown:
When the enhancements for scheduled traffic are supported, additional requirements to determine whether a frame is available for transmission apply, as specified in 8.6.8.4.IEEE Std 802.1Qbv pdf download.