This standard provides the information necessary to ensure interchangeability of compacted data between information processing systems@ communication systems@ and associated equipment using standard code as agreed upon by the interchange parties. This standard deals solely with the requirements for using the compaction algorithm. CAUTION ?C The user's attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard@ no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. However@ the patent holder has filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. No representation or warranty is made or implied that this is the only license that may be required to avoid infringement in the use of this standard. Purpose This standard defines the requirements necessary to ensure interchange. It is distinct from a specification in that it delineates a minimum number of restrictions consistent with compatibility in interchange transactions. Wherever feasible@ quantitative requirements that shall be met or exceeded in order to comply with this standard are given. In all cases@ including those in which quantitative limits for requirements falling within the scope of this standard are not stated but left to agreement between interchange parties@ standard test methods and measurement procedures shall be used to determine such limits. Except as indicated above@ interchange parties complying with the applicable standards should be able to achieve compatibility without the need for additional exchange of technical information.