10BASE-T1S Protocol Support

Automotive

10BASE-T1S Automotive Ethernet

What is 10BASE-T1S?

10BASE-T1S is an IEEE 802.3cg Ethernet standard designed for multi-drop, single twisted-pair automotive and industrial networks. Unlike traditional point-to-point Ethernet, 10BASE-T1S supports a multi-drop bus topology with up to 8 or more nodes sharing a single cable segment, using PLCA (Physical Layer Collision Avoidance) to manage medium access. Operating at 10 Mbps over a single unshielded twisted pair, 10BASE-T1S is positioned as a modern replacement for CAN and LIN in vehicle zone architectures, connecting sensors, actuators, and low-bandwidth ECUs. Engineers developing automotive Ethernet networks need to debug PLCA timing, node beacon sequences, collision handling, and Ethernet frame delivery on the multi-drop bus.

10BASE-T1S Quick Reference

type Serial, differential
signals Single twisted pair
max Speed 10 Mbps
standard IEEE 802.3cg
topology Multi-drop

Acute Instruments Supporting 10BASE-T1S

Recommended Solutions

Recommended for Decode

TB3016F

TB3016F

With Analog Channels

MSO2116E

MSO2116E

All Supporting Products

Protocol Decode
Hardware Trigger
Protocol Exerciser

LA4000 Series

LA4068B
LA4068B
LA4136B
LA4136B

MSO2000 Series

MSO2116B
MSO2116B
MSO2116E
MSO2116E
MSO2216B
MSO2216B

MSO3000 Series

MSO3124B
MSO3124B
MSO3124E
MSO3124E
MSO3124H
MSO3124H
MSO3124V
MSO3124V

TravelBus Series

TB3016B
TB3016B

TravelLogic Series

TL4134B
TL4134B
TL4134E
TL4134E
TL4234B
TL4234B

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How to Analyze 10BASE-T1S with Acute Instruments

1

Connect your Acute logic analyzer to the 10BASE-T1S single twisted pair signals using appropriate probes.

2

Attach a ground lead to the target board's ground reference.

3

In the Acute software, select the 10BASE-T1S protocol decoder and assign the signals to the correct input channels.

4

Configure the decoder for the expected PLCA settings (node count, burst timer, TO timer).

5

Capture and view decoded Ethernet frames and PLCA beacon/transmit opportunity sequences, verifying multi-drop bus access timing and frame delivery.

Frequently Asked Questions

What sample rate do I need for 10BASE-T1S analysis?
10BASE-T1S operates at 10 Mbps with 4B5B encoding, resulting in a 25 MHz symbol rate on the wire. For the digital sideband analysis (PLCA beacons and transmit opportunities), a sample rate of 100-200 MHz is recommended. For full waveform analysis of the twisted-pair signaling, higher rates or oscilloscope channels may be needed.
Why are nodes on my 10BASE-T1S bus not getting transmit opportunities?
In PLCA mode, transmit opportunities are allocated through a beacon sequence initiated by the PLCA coordinator (node 0). If a node is not receiving transmit slots, verify that the coordinator is generating beacons, that the node's PLCA ID is within the configured node count, and that the TO timer is set long enough for each node's transmit window. Capture the PLCA beacon sequence to see the actual transmit opportunity distribution across all nodes.
How many channels are needed for 10BASE-T1S analysis?
10BASE-T1S uses a single twisted pair, so 2 channels (for the differential pair) are needed for bus-level monitoring. If analyzing the MAC-PHY interface at the SPI level (via OPEN Alliance TC6), the channel count depends on the SPI interface width (4-6 channels). Adding a channel for the PHY interrupt signal can help correlate bus events with host processing.

Related Protocols

CAN FD OPEN Alliance TC6

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