Abstract: The IEEE P802.3da, 10 Mb/s Single Pair Multidrop Segments Enhancement Task Force, was formed in June 2020 to develop an Ethernet standard to specify additions and modifications to the IEEE Ethernet Standard 802.3cg-2019 for 10 Mb/s Operation and Associated Power Delivery over a Single Balanced Pair of Conductors. The purpose of the enhancements is to address in building, industrial, and transportation industries that are transitioning from legacy non-Ethernet networks to Ethernet and require enhancements to 10Mb/s multidrop single balanced pair networks, such as larger multidrop topologies and power delivery options.
The paper addresses the development of the performance characteristics of a multidrop mixing segment for 10 Mb/s Ethernet single balanced pair networks supporting up to at least 16 nodes, for up to at least 50 m reach. The mixing segment transmission parameter limits are specified to ensure a bit error ratio (BER) of less than or equal to 10-10 . The mixing segment is a single balanced pair of conductors to which the nodes attach. The transmission performance for Insertion Loss and Return Loss are considered.
Simulation models, based on measured cable and connector s-parameters as well as transmitter and receiver terminations, are presented to validate the mixing segment differential mode transmission performance parameter limits of Insertion Loss (IL) and Return Loss (RL). Additionally, the model is applied for transient analysis of the attached receivers’ eyes to assess constraints on node attachment characteristics, including transmitter and receiver terminations with and without powering options, and drop cable / stub lengths, and node attachment separation.
About the Presenter: Chris DiMinico is President of MC Communications, a telecommunications consulting firm, President/CTO of PHY-SI, LLC, producing high speed test fixtures, and co-founder of SenTekse LLC, developing single-pair Ethernet devices. Chris has over 30 years of experience in the telecommunication industry and plays an active role in the development of a number of telecommunication industry standards. Chris is an active participant and technical contributor in IEEE 802.3, affiliated as consultant with Panduit Corporation; most recently participating in the technical and editorial development of 802.3cd, 802.3ck, 802.3cg (10 Mb/s Single Twisted Pair Ethernet Task Force) and 802.3ch (Multi-Gig Automotive Ethernet PHY Task Force). Chris is the liaison officer from IEEE 802.3 to TIA-TR42 and is the chair of 802.3.24.2 IoT Vertical Applications Task Group.
