1、a I N O Co I- END I !&SYSTEM MOBILE MDP DATA t I Um *- u PERIPHERAL PERIPHERAL MOBILE v RADIO Figure 3-2 Typical Non-Repeater Reference Configuration System and Standard Definitions - Revision A Page 16 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for R
2、esaleNo reproduction or networking permitted without license from IHS-,-,-TSB102 3.4 Specification Formats A uniform specification format will be created for each reference point. Each specification shall be formatted following CCITT models for layered communications protocols, consisting of the fol
3、lowing individual sections. 1. Physical Layer 2. Data Link Layer 3. Network Layer 4. Transport Layer 5. Session Layer 6. Presentation Layer 7. Application Layer Some layers may NOT be present in individual reference point specifications, for example, the Common Air Interface may not include specific
4、ations for layers 4 or higher for data services, as communications between those layers might be completely specified by the data end-system gateway specification and the subscriber unit data peripheral interfaces. Radio Data Peripheral Host Computer RF Sb- A Um Ed Figure 3-3 Example Layered Communi
5、cations Page 17 System and Standard Definitions - Revision A Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TSBLOZ-A 95 3234600 05b995 b4 U TSB102 4 APCO Project 25 STANDAR
6、DS ORGANIZATION This section explains the structure of the APCO Project 25 Standards and Bulletins and provides an overview of the contents of the various standards and bulletins. The standards and bulletins are arranged into 3 separate categories of documents corresponding to different aspects of a
7、 APCO Project 25 system. This section will provide a tool to illustrate the relationship between as well as the subject matter of the various standards and bulletins. The APCO Project 25 Standards and Bulletins will include this overview and definitional document and three categories of documents de
8、aling, respectively, with services, systems, and equipment level standards and bulletins. All aspects of a particular standards and bulletins topic or subject will be in a particular category. This may include, for example, documentation dealing with Definitional, Method of Measurement, Performance
9、Requirement, or Certification and Compliance aspects of a particular subject. The committee recognizes that some subjects may not readily fit in one category and therefore may arbitrarily assign such a subject to a particular category. 4.1 Document Designation And Reference Tables All APCO Project 2
10、5 documents will carry a designation of the form “102 -_ where “ “ may include TSB (Telecommunications Systems Bulletin), IS- (Interim Standard) or TIA (Telecommunication Industry Association Standard) as appropriate for the particular document. These designations are defined in the TIA Engineering
11、Manual. This part of the document designation may change with maturity and as other requisites of the standards and bulletins process are satisfied. The numerals 102 indicate the APCO Project 25 group of documents. The spaces following 102 are occupied by alpha characters assigned using the followin
12、g convention. This overview and definitional document, APCO Project 25 System and Standards Definition, will be designated “102. The categories, of services, systems, and equipment, mentioned above, are designated by the left most alpha character. Specifically: This Standards and Systems Definition:
13、 The equipment category: “102 1 02 .A- - - “102.B- - - The services category: The systems category: 1 02. c- - - The next two alpha characters will be used to designate a particular subject or topic within a category and the last alpha character will be used to designate a particular standards docum
14、ent dealing with that subject. Graphically the structure of the APCO Project 25 Standards and Bulletins is illustrated in Figure 4-1. System and Standard Definitions - Revision A Page 18 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
