Ethernet switch enables deterministic interconnect for cars, machinery

July 27, 2015 // By Christoph Hammerschmidt
Deterministic Ethernet is one of the most promising technology candidates for future in-car networking, in particular for safety-relevant functions. For these next-generation in-car data backbones, Austrian technology provider TTTech Computertechnik AG now has rolled out the Hermes Ethernet switch.

With the product, TTTech targets application development and evaluation of in-vehicle network architectures in the field of automotive and heavy machinery. This intelligent devices enables users to evaluate multiple technical standards supported by the NXP SJA1105T chip, including AVB, TSN and Time-Triggered Ethernet. The switch also integrates a CPU running AUTOSAR 4.2.1 software and provides digital and analog I/Os plus CAN, FlexRay and Ethernet interfaces.

The DESwitch Hermes 3/1 BRR makes development and evaluation of AVB and TSN possible in a versatile form factor. The SJA1105T chip from NXP enables networks with plain vanilla Ethernet for best effort traffic, Quality of Service (QoS) for using VLANs and priorities, Audio-Video Bridging (AVB) for clock synchronization and traffic shaping, Time-Sensitive Networking (TSN) for time-aware shaping and Time-Triggered Ethernet for time-triggered communication and fault-tolerant clock synchronization. Combined with its integrated control functionality, Hermes will enable a wide range of in-vehicle projects for diagnostics, control applications, infotainment and advanced driver assistance systems (ADAS).

Chipmaker NXP has previously licensed the Ethernet Switch IP from TTTech and used it to develop its first Ethernet switch chip SJA1105T. “The Hermes Deterministic Ethernet switch from TTTech serves as a platform for evaluating the functionality of our SJA1105T Ethernet switch IC, making this another stepping stone within our cooperation,“ says Günter Sporer, Segment Director Ethernet at NXP Semiconductors.
The Hermes switch offers 3 x BroadR-Reach physical layer interfaces that enable 100 Mbit/s full-duplex communication over unshielded twisted single pair (UTSP) cabling in addition to one 100/1000Base-Tx port. TTTech will also offer a lab version with 4 x 100/1000 Base-Tx ports and RJ-45 connectors.

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