IEEE P802.3cg 10BASE-T1S Relationship of PLCA to the Layered Stack Model
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1 IEEE P802.3cg 10BASE-T1S Relationship of PLCA to the Layered Stack Model David D. Brandt, Rockwell Automation IEEE P802.3cg 10 Mb/s Single Pair Ethernet Task Force 6 February 2019 Ad Hoc Page 1
2 Purpose The purpose of this presentation is to discuss the relationship of PLCA to the IEEE layered stack model Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 2
3 Layered Architecture IEEE adopts a layered architecture Each layer provides services to upper layers Each layer depends on the services from lower layers Services are provided through a defined service interface This architecture allows adaptability and innovation by substitution of a layer by one that functions differently (including better), but does not break the service interface contracts Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 3
4 IEEE architecture IEEE claims to correspond closely with ISO OSI, highlighting the major difference as splitting of the Data Link Layer into MAC and LLC. Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 4
5 ISO/OSI reference Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 5
6 OSI definitions The Physical Layer has control over bit-level transmissions Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 6
7 OSI principle A layer may enhance the service it provides to the layer above Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 7
8 Interface between layers The IEEE architectural model defines an interface between the MAC sublayer and the Physical Layer Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 8
9 PLS service interface The (N-1)-entity Physical Layer provides services to the (N)-entity MAC through the PLS service interface Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 9
10 PLS overloading (CRS) The PLS_carrier.indication has a precedent of being augmented Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 10
11 PLS overloading (COL) The PLS_SIGNAL.indication has a precedent of being augmented Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 11
12 Collision avoidance policy The CSMA/CD MAC follows a policy of attempting to avoid collisions The Physical Layer service provides interface information in support of this policy A Physical Layer enhanced with PLCA improves the quality of this service The MAC defers instead of creating a collision This improves the MAC s ability to implement it s policy Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 12
13 Conclusion PLCA augments (enhances) the existing service indications provided by the Physical Layer to the CSMA/CD MAC sublayer This is an improvement in the quality of the service provided by the Physical Layer to the CSMA/CD MAC sub-layer, following OSI principles Version 1.0 IEEE P802.3cg 10 IEEE Mb/s Single P802.3 Pair Maintenance Ethernet Task report Force July 6 February 2008 Plenary 2019 Ad Hoc Page 13
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