One of the reasons - apart from pigheadedness - for the continuing existence of traditional fieldbuses is the lack of determinism in ethernet networking. Even industrial variants rarely show the reliability required by extremely timing-critical systems. There are ways to overcome this, e.g. by tweaking networking protocols and fine-tuning software. A wholly deterministic and specialized operating system could do the trick as well.
HiOS is currently available in two Layer 2 versions, with a Layer 3 version under development. Supported by both the Standard and Advanced versions, management protocols include Telnet, SSHv2, HTTP, HTTPS, TFTP, SFTP, and SNMP v1/v2/v3. In addition to PRP und HSR, redundancy protocols also include MRP (Media Redundancy Protocol), Fast MRP, and RSTP (Rapid Spanning Tree Protocol).
The security mechanisms provided by both Layer 2 versions of the operating system comprise MAC-based Port Security, Authentication (IEEE802.1x), Guest/unauthenticated VLAN, Radius Client, Restricted Management Access, Local User Accounts, various Privilege Levels, Management Authentication via Radius, Account Locking, configurable Password Policy and Login Attempts, Audit Trail, CLI/SNMP Logging, and HTTPS-certified Management.
Users opting for the Advanced version also obtain QoS functions (Quality of Service) such as DiffServ, VLAN extensions, and security mechanisms such as Access Control List (ACL) and IEEE802.1x Multi Client Authentication. Both Layer 2 operating system versions can currently be used with switches belonging to the RSP, EES and MSP series.