# Physical Layer

#### Learn about the OSI physical layer, which serves as the framework for network data delivery, and how protocols such as Automotive Ethernet, CAN Bus, and LIN implement its concepts in practical settings.

 3 min read

// hardware

## Choose hardware for your integration

Compare Mini, CAN-FD Pro and TMU CM4 by vehicle data access, interfaces and custom software needs.

        [Compare devices →](https://www.autopi.io/hardware/compare/)

###### Fleet Hardware

## Ready to ship. Built for fleet scale.

All devices ship with AutoPi Cloud Fleet management included. For large deployments, we recommend the AutoPi Mini or TMU CM4.

            Mini
            Fleet recommended

### Fleet telematics & OBD-II

Plug-and-play OBD-II and EV parameter logging at fleet scale. Built-in 4G/LTE, GPS tracking and wide OEM parameter support - zero external hardware, zero configuration overhead.

→ OBD-II / K-Line · EV parameters · GPS tracking

→ 4G/LTE Cat 1 · BLE · internal antennas

→ −40°C to +85°C · CE/UKCA/E-Mark/RoHS

→ 10–30 V DC · compact · fleet-ready out of box

            €129  |  OBD-II / K-Line  |  4G/LTE Cat 1

          [Order Mini](https://shop.autopi.io/products/autopi-mini)
          [Learn more](https://www.autopi.io/hardware/autopi-mini/)

            TMU CM4
            Fleet recommended

### Edge compute platform

Raspberry Pi CM4-based telematics unit for custom software stacks at fleet scale. Run Docker containers, Python services and CAN-FD logging - managed remotely via AutoPi Cloud.

→ BCM2711 CM4 · 1 GB LPDDR4 · 8 GB eMMC

→ 2× CAN-FD · Docker · Python · SocketCAN

→ NXP SE051 · Tailscale · WiFi · BT 5.0 · GPS

→ 12–35 V DC · 4G/LTE Cat 4 · IP67 option

            €235  |  2× CAN-FD  |  100 sps  |  CM4

          [Order TMU CM4](https://shop.autopi.io/products/autopi-telematics-unit-cm4-4g-lte-edition)
          [Learn more](https://www.autopi.io/hardware/autopi-tmu-cm4/)

            CAN-FD Pro
            OEM recommended

### Dual CAN-FD data logger

High-throughput raw frame capture on two independent CAN-FD channels with on-device DBC decoding and ASAM MDF4 output. Ideal for R&D and specialist fleet deployments.

→ 2× CAN-FD · >3,000 fps/channel · 5 Mbps

→ 4 GB LPDDR4 · 32 GB eMMC + USB expansion

→ NXP SE051 · Tailscale SSH · Docker · S3 sync

→ 12–35 V DC · J1939 · OBD-II · 4G/LTE + GPS

            €599  |  2× CAN-FD  |  ~4,000 sps  |  4 GB RAM

          [Order CAN-FD Pro](https://shop.autopi.io/products/autopi-can-fd-pro)
          [Learn more](https://www.autopi.io/hardware/autopi-canfd-pro/)

      [Compare all devices →](https://www.autopi.io/hardware/compare/)

            // contact

## Still have questions?

Get in touch with us - we're ready to answer any and all questions.

// send a message

We aim to reply within one business day.

Or email [sales@autopi.io](mailto:sales@autopi.io).