Infrared Data Association
Serial Infrared Link Access Protocol (IrLAP)
Version 1.1
June 16, 1996
IBM Corporation
Hewlett-Packard Company
Apple Computer, Inc.
Counterpoint Systems Foundry, Inc.
IrLAP Version 1.1
2
Authors:
Timothy Williams, Peter Hortensius, Frank Novak (IBM Corporation)
Kevin Smith (Hewlett-Packard Company)
David Suvak (Hewlett-Packard Company, Counterpoint Systems Foundry, Inc.)
Mike Cremer (Apple Computer, Inc.)
Significant Contributors:
Darrell Sell (Connexus)
Document Status
Version 1.0: This document has been submitted to the IrDA committee for a vote of approval. It was unanimously
approved. The authors reserve the right to make small editing changes and to complete section 0 8.
Appendix B (Point-To-Multipoint).
Version 1.1: This version has been approved by the IrDA. It incorporates all errata submitted for version 1.0
including the changes necessary for adding the higher speeds 576kbps, 1.152Mbps and 4.0Mbps.
IrLAP Version 1.1
3
INFRARED DATA ASSOCIATION (IrDA) - NOTICE TO THE TRADE -
SUMMARY:
Following is the notice of conditions and understandings upon which this document is made available to members and non-
members of the Infrared Data Association.
• Availability of Publications, Updates and Notices
• Full Copyright Claims Must be Honored
• Controlled Distribution Privileges for IrDA Members Only
• Trademarks of IrDA - Prohibitions and Authorized Use
• No Representation of Third Party Rights
• Limitation of Liability
• Disclaimer of Warranty
• Certification of Products Requires Specific Authorization from IrDA after Product Testing for IrDA Specification
Conformance
IrDA PUBLICATIONS and UPDATES:
IrDA publications, including notifications, updates, and revisions, are accessed electronically by IrDA members in good
standing during the course of each year as a benefit of annual IrDA membership. Electronic copies are available to the public on
the IrDA web site located at irda.org. IrDA publications are available to non-IrDA members for a pre-paid fee. Requests for
publications, membership applications or more information should be addressed to: Infrared Data Association, P.O. Box 3883,
Walnut Creek, California, U.S.A. 94598; or e-mail address: info@irda.org; or by calling John LaRoche at (510) 943-6546 or
faxing requests to (510) 934-5600.
COPYRIGHT:
1. Prohibitions: IrDA claims copyright in all IrDA publications. Any unauthorized reproduction, distribution, display or
modification, in whole or in part, is strictly prohibited.
2. Authorized Use: Any authorized use of IrDA publications (in whole or in part) is under NONEXCLUSIVE USE LICENSE
ONLY. No rights to sublicense, assign or transfer the license are granted and any attempt to do so is void.
DISTRIBUTION PRIVILEGES for IrDA MEMBERS ONLY:
IrDA Members Limited Reproduction and Distribution Privilege: A limited privilege of reproduction and distribution of IrDA
copyrighted publications is granted to IrDA members in good standing and for sole purpose of reasonable reproduction and
distribution to non-IrDA members who are engaged by contract with an IrDA member for the development of IrDA certified
products. Reproduction and distribution by the non-IrDA member is strictly prohibited.
TRANSACTION NOTICE to IrDA MEMBERS ONLY:
Each and every copy made for distribution under the limited reproduction and distribution privilege shall be conspicuously
marked with the name of the IrDA member and the name of the receiving party. Upon reproduction for distribution, the
distributing IrDA member shall promptly notify IrDA (in writing or by e-mail) of the identity of the receiving party.
A failure to comply with the notification requirement to IrDA shall render the reproduction and distribution unauthorized and
IrDA may take appropriate action to enforce its copyright, including but not limited to, the termination of the limited
reproduction and distribution privilege and IrDA membership of the non-complying member.
TRADEMARKS:
1. Prohibitions: IrDA claims exclusive rights in its trade names, trademarks, service marks, collective membership marks and
certification marks (hereinafter collectively "trademarks"), including but not limited to the following trademarks: INFRARED
DATA ASSOCIATION (wordmark alone and with IR logo), IrDA (acronym mark alone and with IR logo), IR logo, IR DATA
CERTIFIED (composite mark), and MEMBER IrDA (wordmark alone and with IR logo). Any unauthorized use of IrDA
trademarks is strictly prohibited.
IrLAP Version 1.1
4
2. Authorized Use: Any authorized use of a IrDA collective membership mark or certification mark is by NONEXCLUSIVE
USE LICENSE ONLY. No rights to sublicense, assign or transfer the license are granted and any attempt to do so is void.
NO REPRESENTATION of THIRD PARTY RIGHTS:
IrDA makes no representation or warranty whatsoever with regard to IrDA member or third party ownership, licensing or
infringement/non-infringement of intellectual property rights. Each recipient of IrDA publications, whether or not an IrDA
member, should seek the independent advice of legal counsel with regard to any possible violation of third party rights arising
out of the use, attempted use, reproduction, distribution or public display of IrDA publications.
IrDA assumes no obligation or responsibility whatsoever to advise its members or non-members who receive or are about to
receive IrDA publications of the chance of infringement or violation of any right of an IrDA member or third party arising out of
the use, attempted use, reproduction, distribution or display of IrDA publications.
LIMITATION of LIABILITY:
BY ANY ACTUAL OR ATTEMPTED USE, REPRODUCTION, DISTRIBUTION OR PUBLIC DISPLAY OF ANY IrDA
PUBLICATION, ANY PARTICIPANT IN SUCH REAL OR ATTEMPTED ACTS, WHETHER OR NOT A MEMBER OF
IrDA, AGREES TO ASSUME ANY AND ALL RISK ASSOCIATED WITH SUCH ACTS, INCLUDING BUT NOT LIMITED
TO LOST PROFITS, LOST SAVINGS, OR OTHER CONSEQUENTIAL, SPECIAL, INCIDENTAL OR PUNITIVE
DAMAGES. IrDA SHALL HAVE NO LIABILITY WHATSOEVER FOR SUCH ACTS NOR FOR THE CONTENT,
ACCURACY OR LEVEL OF ISSUE OF AN IrDA PUBLICATION.
DISCLAIMER of WARRANTY:
All IrDA publications are provided "AS IS" and without warranty of any kind. IrDA (and each of its members, wholly and
collectively, hereinafter "IrDA") EXPRESSLY DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE AND WARRANTY OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS.
IrDA DOES NOT WARRANT THAT ITS PUBLICATIONS WILL MEET YOUR REQUIREMENTS OR THAT ANY USE OF
A PUBLICATION WILL BE UN-INTERRUPTED OR ERROR FREE, OR THAT DEFECTS WILL BE CORRECTED.
FURTHERMORE, IrDA DOES NOT WARRANT OR MAKE ANY REPRESENTATIONS REGARDING USE OR THE
RESULTS OR THE USE OF IrDA PUBLICATIONS IN TERMS OF THEIR CORRECTNESS, ACCURACY, RELIABILITY,
OR OTHERWISE. NO ORAL OR WRITTEN PUBLICATION OR ADVICE OF A REPRESENTATIVE (OR MEMBER) OF
IrDA SHALL CREATE A WARRANTY OR IN ANY WAY INCREASE THE SCOPE OF THIS WARRANTY.
LIMITED MEDIA WARRANTY:
IrDA warrants ONLY the media upon which any publication is recorded to be free from defects in materials and workmanship
under normal use for a period of ninety (90) days from the date of distribution as evidenced by the distribution records of IrDA.
IrDA's entire liability and recipient's exclusive remedy will be replacement of the media not meeting this limited warranty and
which is returned to IrDA. IrDA shall have no responsibility to replace media damaged by accident, abuse or misapplication.
ANY IMPLIED WARRANTIES ON THE MEDIA, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO NINETY (90) DAYS FROM THE
DATE OF DELIVERY. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE
OTHER RIGHTS WHICH VARY FROM PLACE TO PLACE.
CERTIFICATION and GENERAL:
Membership in IrDA or use of IrDA publications does NOT constitute IrDA compliance. It is the sole responsibility of each
manufacturer, whether or not an IrDA member, to obtain product compliance in accordance with IrDA rules for compliance.
All rights, prohibitions of right, agreements and terms and conditions regarding use of IrDA publications and IrDA rules for
compliance of products are governed by the laws and regulations of the United States. However, each manufacturer is solely
responsible for compliance with the import/export laws of the countries in which they conduct business. The information
contained in this document is provided as is and is subject to change without notice.
IrLAP Version 1.1
5
TABLE OF CONTENTS
1. INTRODUCTION.......................................................................................................11
1.1 Scope and Purpose .......................................................................................................................................... 11
1.2 References........................................................................................................................................................ 12
1.3 Acronyms and Definitions .............................................................................................................................. 12
1.4 Bit and Byte Ordering .................................................................................................................................... 13
2. DATA LINK LAYER SERVICE SPECIFICATIONS...................................................14
2.1 IrLAP Service Definitions .............................................................................................................................. 14
2.2 Connectionless Services.................................................................................................................................. 15
2.2.1 Discovery Services..................................................................................................................................... 15
2.2.2 Address Conflict Services.......................................................................................................................... 15
2.2.3 Unit Data Services...................................................................................................................................... 16
2.3 Connection Oriented Services........................................................................................................................ 16
2.3.1 Connect Services........................................................................................................................................ 16
2.3.2 Sniffing Services ........................................................................................................................................ 17
2.3.3 Data Services.............................................................................................................................................. 17
2.3.4 Status Services ........................................................................................................................................... 17
2.3.5 Reset Services............................................................................................................................................ 18
2.3.6 Disconnection Services.............................................................................................................................. 18
3. ENVIRONMENTAL AND OPERATIONAL CHARACTERISTICS.............................19
3.1 Configurations and Operating Characteristics ............................................................................................ 19
3.2 Data Link States.............................................................................................................................................. 19
3.3 Unbalanced Data Link.................................................................................................................................... 19
3.4 Modes............................................................................................................................................................... 20
4. IRLAP FRAME STRUCTURE ...................................................................................21
4.1 General............................................................................................................................................................. 21
4.2 IrLAP Frame................................................................................................................................................... 21
4.2.1 Frame Format............................................................................................................................................. 21
4.2.2 Wrapping Layer ......................................................................................................................................... 21
4.3 Elements of the IrLAP Frame........................................................................................................................ 22
4.3.1 Address ...................................................................................................................................................... 22
4.3.1.1 Address Field Representation.............................................................................................................. 22
