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LXI Standard Evolution. David Owen, Technical Committee Chair LXI Consortium Business Development Manager Pickering Interfaces [email protected] LXI – “It’s About Your Time”. LXI Evolution. Describe the latest changes to the specification

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lxi standard evolution

LXI Standard Evolution

David Owen, Technical Committee Chair LXI Consortium

Business Development Manager Pickering Interfaces

[email protected]

LXI – “It’s About Your Time”

lxi evolution
LXI Evolution
  • Describe the latest changes to the specification
    • Revision 1.2 to Revision 1.3 voting has now successfully completed
  • Where LXI goes to from here
the drivers for change
The drivers for change
  • Adoption of 1588-2008
    • To improve timing performance in the presence of LAN traffic
    • Follow the path being taken by network infrastructure providers
    • Does not impact Class C products
  • Addition of mDNS
    • To improve Discovery
  • Conversion of 1.2 Future Rules to Rules
  • During creation another primary driver emerged
    • Re-organisation of specification
      • Make it easier to read
      • Make preparation for any future evolution
specification re organization
Specification Re-organization
  • Sections renumbered
    • Rules and text grouped together by features to improve readability
      • Rule numbers have changed!
  • References to roadmap items have been removed
    • Intention is to handle in a different way
  • No future rules
    • Intention is to handle in a different way
    • Deal with a problem identified by LXI vendors
  • Deprecated clauses have been removed
    • Improve readability and flow of the specification
    • Simplified reorganizing the numbering specification
migration to ieee1588 2008
Migration to IEEE1588-2008
  • Standard simply refers to IEEE1588
    • Interpret as the latest version
      • IEEE1588-2008 (1588V2)
  • Creation of LXI IEEE1588 Profile
    • Separate stand alone specification
      • Defines the parameter ranges and detail of the IEEE1588 aspects
      • Separating provides easier maintenance of IEEE1588 aspects
ieee1558 web page changes
IEEE1558 Web Page Changes
  • Changes to what appears on web pages
  • Web page examples in Appendix updated
    • These are simply guideline examples
    • They do reflect the minimum content required for devices supporting IEEE1588
what impact does 1588 change have
What impact does 1588 change have?
  • It improves the timing accuracy in the presence of network delays
    • It accounts for the delays through infrastructure devices with high traffic loads
    • Measures the incoming and outgoing control message timing
  • It can coexist with 1588-2002 using separated domains
    • White paper on the issue will be available from the LXI Consortium
adoption of mdns discovery
Adoption of mDNS Discovery
  • Discovery improvements
    • Standard used for discovery of devices like printers
      • Also known as Apple Bonjour, Rendezvous in earlier descriptions
    • Provides much faster Discovery
    • Easier programmatic integration
  • There is a limited time waiver on mDNS for some implementations
section 2 lxi unit deletion
Section 2 LXI Unit Deletion
  • LXI Unit was an effort at defining half rack width dimensions and mechanical interface
  • References to LXI Unit removed
  • The standard has no physical restrictions on mechanical sizes or definitions
    • Still has guidance on other issues and rules governing indicators and interconnect locations
changes to c extended features
Changes to C Extended Features
  • Features that can be added to Class C that are usually part of Class B or Class A
    • In version1.2 WTB and LAN messaging identified as extended features
    • In 1.3 additional features are identified (Section 1.9)
      • 5 features – (LXI) 1588, WTB, LAN Messaging, Event Log, Time Stamping
      • Compliance requirements of features are positively identified
      • Helps organize the standard
changes class c extended features
Changes Class C Extended Features
  • Class model does NOT change
    • Class A,B,C are the class declarations that will be made
    • It will continue to be the focus of LXI
  • The 5 additional features are precisely defined to have a meaning in the standard
    • Use the protection of “LXI” in their description
    • Market forces will define how much take up there will be
    • Implementing all 5 features takes a Class C product to Class A
why the extended features
Why the Extended features?
  • It allows vendors to pick a smaller added feature set in support of specific markets
    • Saves investment in a full feature set
    • Particularly useful for Devices with low cost controller systems
  • It ensures these features have been third party tested for interoperability
    • Protects the feature description
    • Protects the LXI brand
  • The Device remains as Class C
updated conformance sections
Updated Conformance Sections
  • Simply reflect current rather past practice
  • Expect this to be moved to a separate document on a future revision
nvs and pve dates
NVS and PVE Dates
  • NVS (New Version Start)
    • Consortium tests to 1.3 from October 2008
    • Continues to test to 1.2
  • PVE (Previous Version End)
    • November 2009 is the last time we test new products to 1.2
  • mDNS Waiver
    • For products otherwise compliant to 1.3 waiver scheme in place
    • Vendor must be compliant by PVE date
where does the standard go from here 1
Where does the standard go from here? (1)
  • Class C is unlikely to change from Version 1.3
    • It will be the baseline for future versions
    • Change will only occur due to enforced change caused by technology migration
where does the standard go from here 2
Where does the standard go from here? (2)
  • Focus moves to System level issues
    • Resource management
      • Arbitrate between different test processes demanding access to the same resources
    • Improved Web support for triggering
      • Aid to Debugging system level problems with trigger events between devices
        • LAN Triggers
        • WTB
    • Event Log
      • Make it easy to grab log data from multiple devices and combine the data in a meaningful way
where does the standard go from here 3
Where does the standard go from here? (3)
  • The Consortium will continue to follow technology changes that could have an impact
    • IPV6
    • PoE
  • None of these will have a short or medium term impact
    • The IT legacy of Ethernet will ensure continued support
compliance evolution
Compliance Evolution
  • Great deal of ongoing work on compliance issues
    • Developing IEEE1588 procedures
    • Preparing for a date when self certification might be permitted
      • At present it is not, and that will not change for at least a year
      • It is likely to only apply to experienced members
system level analysis
System Level Analysis
  • Analyse the other system level issues that may need attention
    • Might include other features
      • State Management
      • Script management
      • Peer to Peer Communications
      • Any other issues found to influence adoption rates
  • Intent is still to use 1.3 as the baseline specification for Class C
when is the next version
When is the next Version?
  • Maybe two years away
  • But new features will be published in the interim
    • Vendors may chose to implement them
    • New features will be subject to testing before claiming as an LXI feature
    • Backward compatibility will be maintained
  • The LXI Consortium will continue to support an active and thriving specification evolution
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