TSEP Peter Plazotta, CEO of TSEP David Courtney, Junior Developer from TSEP About TSEP >20 staff members (engineers, software developers, software developer trainees) Development of complete software solutions for Measuring Devices Development of test systems for different companies, used world wide (Germany, US, China, Japan, Singapore) System software development for customers LXI Member

Agenda Introduction to LXI LXI Standard 1.5 LXI Reference Design IEEE 1588 Standard Usage of 1588 in terms of LXI

Introduction to LXI LXI is a standard which defines the behaviour of measuring devices in a network 2004 a non-profit consortium was founded by leading T&M companies Today more than 50 T&M companies are represented More than 3600 devices are LXI certified All major players are represented in the LXI Consortium Network is available on nearly every device, other bus systems are out dated (GPIB)

LXI Standard 1.5 Main goal: Define the behaviour of measuring devices in a network 1.5 LXI Device Specification 2016 components: Optional Extended Functions: LXI HiSLIP Physical Specifications LXI Event Messaging Programmatic Interface LXI Event Logging Web interface LXI Clock Synchronization Network Configuration LXI Timestamped Data mDNS for Device Discovery LXI Wired Trigger Bus LXI VXI-11 Discovery and Identification LXI IPv6

LXI Reference Design Development: 2014: Start of development 2016: Release of the LXI Reference Design Benefits: Low cost solution for T&M companies to develop LXI conform devices Cost-reduction in maintenance and further development (resides with the LXI Consortium) Supports Windows and Linux Support Capabilities: VendorForum Mantis bug tracing To take advantage of the LXI Reference Design, you must be an LXI member

LXI Reference Design – LXI Standard mDNS Module Event Logging Module Event Messaging HiSLIP Module & Server Firmware Interface Network Configuration Core Framework LXI Device Specification 2016 Modules Optional Extended Functions Excluded Extended Functions Coming Soon to the Reference Design VXI-11 Module Clock Synchronisation Module Timestamped Data Module Wired Trigger Bus Module

IEEE 1588 - Introduction Aim of IEEE 1588 is to dstribute the time of a very exact time source such as an atomic clock or GPS to one or several devices in a network. 1985: NTP Protocol published as RFC 985 by David L. Mills which achieved accuracies around a microsecond (1x10-6 sec) 1990: a group around John C. Eidson was created to improve the NTP protocol 2000: John C. Eidson published there results 2002: IEEE Standard 1588-2002 was published as a result of John C. Eidson investigations which shall achieve accuracies within sub micro seconds. 2008: Current standard IEEE 1588-2008 was published What has happened since: The team around John C. Eidson is continuing to improve the standard But also a coaltion of companies and institutions (CERN, GSI Helmholtz-Center, National Instruments) devloped 2011 the „White Rabbit Standard“ which was derived from IEEE 1588-2008

IEEE 1588 – Problems to solve Major issues to synchronize devices: Each device is implemented as a counter which counts the cycles and calculates the time via the freuquency of the time source. These cycles vary from device to device. Ethernet is a non deterministic connection, therefore the transmission times vary Runtimes within a device (network stacks, drivers etc.) are also not deterministic, as „preemtive scheduling“ can interrupt any process at any time. As a transfer medium a consumer product shall be used (network chips)

1588 - Synchronization T1: Master sends periodically Sync messages (containing send time) T2: Slave receives Sync message T3: Slave issues Delay Request messages Master responds with a Delay Response message T4: Slave receives Delay Response which contains the receive time of the previously sent Delay Request message.

How can we use 1588 in terms of LXI? Facts: Trigger runtime per meter: 4ns With a precision of 20ns via 1588, measurements are more precise than any trigger via >5m cables. Use-cases: Synchronised devices can fullfill high precision measuring with distance being irrelevant Run measuring sequences based on time sequences instead of triggers Offline evaluation and correlation of measuring data LXI: LXI Clock Synchronization coming soon to the LXI Reference Design (planed June 2017) LXI provides LAN Event Messages which enhance the advantages of 1588 by using time stamps.

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