This International Standard defines CDMA spread spectrum modulation schemes in terms of: a) the services provided to the users of this specification; b) spreading code formats; and c) the procedures performed to generate and process the code formats. It does not specify: a) individual implementations or products; b) the methods or technologies required to perform the procedures; or c) the management activities required to configure and control the system. This International Standard provides only those parameter requirements relating to signal compatibility with the existing SNIP PN spread modulation systems (see C.1). There are many other types of requirements, not specifically related to PN spread modulation signal formats, which must be met to ensure system compatibility with existing SNIP hardware. Examples would include forward error correction coding format, data signal formats, etc. This International Standard applies to the creation of agency standards and to the future data communications over space links between CCSDS agencies in cross-support situations. This International Standard includes comprehensive specification of the data formats and procedures for inter-agency cross support. It is neither a specification of, nor a design for, real systems that may be implemented for existing or future missions. This International Standard is to be invoked through the normal standards programs of each CCSDS agency, and is applicable to those missions for which cross support based on capabilities described in this International Standard is anticipated. Where mandatory capabilities are clearly indicated in sections of this International Standard, they must be implemented when this document is used as a basis for cross support. Where options are allowed or implied, implementation of these options is subject to specific bilateral cross-support agreements between the agencies involved.