1、TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Cellular Digital Packet Data System Specification - Part 1 O 1 O Intermediate System TSB-87- 1 O 1 O Reaffirmed August 9,2002 ODECEMBER 1997 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Teleconmunications Industry Association represents the conmiunications sect
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20、 Part 1010 Intermediate System TSB87-1010 DECEMBER 1997 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Ea R-s-u-W iuasocWonwhleElsimo*Ilao JNDUSIRY ALA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA/EiA does not assume any liability to any patent owne
21、r, nor does it assume any obligation whatever to parties adopting the Standard, Publication, or Bulletin. Technical Bulletins are distinguished from WEU Standards or Intek Standards, in that they contain a compilation of engineering data or information useful to the technical community, and represen
22、t approaches to good enbring practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who
23、 wish to bring other approaches to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committee to revise and update this Bulletin from time to time as may be occasioned by cha
24、nges in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 4002, fonnulated under the cognizance of the TIA TR-45.6 Adjunct Wireless Packet Data Standards Subcommittee) hiblished by ?ELECOMMUNICATiONS INDUSTRY ASSOCIATION 1997 Standards and
25、Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the current Catalog of EIA, JEDEC and TIA STANDARDS and ENGINEERING PUBLICATIONS International (303-397-7956) AU rights reserved Printed in U.S.A. or call Global Engineering Documents, USA and Canada (1-800-854-71
26、79) , - TlAEIVTSB-87-1010 PART 1010 Table of Contents O Foreword 1010-iii Document Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .lOlO-iii 0.1 1 Introduction 1010-1 2 CDPD Intermediate System Architecture. . . . . . . . . . . . . . . . . .
27、. . . . . . . . . . . . . . 1010-1 2.1 Intemediate System Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010-2 2.2 Classes of Intermediate Systems . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10104 3 Intermediate System Prot
28、ocol Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010-5 3.1 Border Intermediate System (BIS) Profiles . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . 1010-5 3.2 Non-border Intermediate System Profiles . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . 1010-6 TIAEIATTSB-87-1 O10 Foreword PART 1010 Intermediate System O Foreword o. 1 This foreword is not part of this Telecommunications Systems Bulletin. This Telecommunications Systems Bulletin has been developed by Subcommittee TR-45.6, and contains information which may be useful to im
30、plementors of systems compliant with TSB-87, “Cellular Digital Packet Data System Specification,” or its derivatives. This document contains significant portions of material originally submitted by the Cellular Digital Packet Data Forum Inc. CDPD is a technology intended to provide packet data netwo
31、rking services to mobile hosts. The media used to provide these services consists of radio channels typically used for Advanced Mobile Phone System (AMPS) cellular service. Document Structure This Telecommunications Systems Bulletin is published as a series of Parts. Each Part contains information p
32、ertaining to one aspect of the system. The functional structure of this TSB is as follows: e Part 1000 to Part 1999-Guidelines for Service Providers These Parts are informative and discuss non-CDPD specific entities (such as Intermediate Systems), support services (such as directory - lOlO-iii Previ
33、ous page is blank TlANNTSB-87-1010 Intermediate System services, accounting summary and settlement procedures, authentication, etc.), value-added services (such as subscriber location) and Service Provider issues (such as an interoperability test plan overview and parameter codiguration). Part 1000
34、contains the detailed listing of all Parts of this TSB. Part 2000 to Part 2999-Guidelines for Manufacturers of CDPD equipment These Parts are informative and discuss such concerns as CDPD-specific entities (such as Mobile End Systems (M-ESs), Mobile Data Base Stations (MDBSs) and Mobile Data Interme
35、diate Systems (MD-ISS), external interfaces (such as that between the Subscriber Unit (SU) and the Subscriber Identity Module (SIM) and multicasts from the perspective of each of the participating entities. Part 3000 to Part 3999-Guidelines for the CDPD Network Information Center (NIC). These Parts
36、are informative and describe the issues and procedures which must be addressed by an agency serving as a NIC on behaif of the CDPD community. e o 1 o1 (Hv Introduction TIAIEIAlTSB-87-1010 PART 1010 Intermediate System 1 I nt roduct ion 2 Intermediate Systems QSs) are off-the-shelf elements that rout
37、e Internet Protocol (IP) and IS0 Connectionless Network Protocol (CLNP) datagrams between MD-ISS, and between MD-ISS and Fixed End Systems (F-ESs) (Figure 1010-1). ISS also may be used to route mobile data link frames that are encapsulated in CLNP datagrams between Mobile Data Base Stations (MDBSs)
38、and MD-ISS. CDPD Intermediate System Architecture An ISS primary function is to receive Network Layer packets (i.e., datagramc. IKPDUs) on one interface and forward them out over another interface. An IS supports at least two physical interfaces which may be of the same or of different types. As Fig
39、ure 1 O 1 O- 1 illustrates, multiple ISS are often configured so that there is more than one potential path between any two ISS. Although not illustrated, it is also common to configure multiple paths to/from a destination such as an F-ES or an MD-IS. 1010-1 TIAIEISBII-I o10 intermediate System FIGU
40、RE 1010-1 Intermediate Systems E-interface External Network Service Provider Network A Service Provider Network B 2.1 Intermediate System Capabilities ISS have several capabilities that simplify the construction of complex networks: a. ISS incorporate routing algorithms with the following attributes
41、: 1. Routing robustness with changing topologies The network of interconnected nodes should continue to operate even if specific links or nodes fail. Routing decisions should be based on the best route after considering network traffic, path speed and path reliability. It should be possible to remov
42、e faulty components (due to either hardware or software failures) from the network and have the network routing tables adjust themselves accordingly. b. ISS have the capability to multiplex Network Protocol Data Units (NPDUs) from different sources onto a single link, and to de-multiplex WDUs from a
43、 link and forward them onto possibly different links. This allows one link to serve multiple source-destination traffic streams. 2. Dynamic Routing 3. Self-stabilization 1010-2 ._ TIAEIARSB-87-1010 CDPD Intermediate System Architecture - C. d. e. f. ISS have the capability to connect to Local Area N
44、etworks (LANs) (e.g FDDI, Ethernet, Token Ring) in addition to serial (point-to-point) links. This provides flexibility in attachment options and link speeds. ISS (e.g., multi-protocol routers) have the capability to forward many different t.ypes of NPDUs. The routers for CDPD must, at a minimum, be
45、 able to forward IP and CLNP NPDUs. ISS may act as a firewail. For instance, ISS may prevent packets from being forwarded to specified destination addresses or from being accepted from specified source addresses. Alternatively, ISS may be set up to only forward packets with specified source addresse
46、s or specified destination addresses. ISS support specific borderhoundaryhnter-domain routing protocols. These protocols allow routing policies to be established and enforced regarding the routing of transit traffic through a domain. These may be helpful with specific complex network configurations,
47、 involving possibly multiple service provider networks and multiple external networks (Figure 1 O 10-2). Border routers in a CDPD Service Providers network and in some cases Areas within that network must, at a minimum, support Classless Interdomain Routing (CIDR). CIDR support for IP requires the u
48、se of Border Gateway Protocol 4 (BGP4) and for CLNP it requires the use of Interdomain Routing Protocol (IDRP). FIGURE 1010-2 Routing Domains (Service Provider and External Networks) A-interface E-Interface External Network -. 1 O1 0-3 intermediate System TlAIEIWSB-87-101 O 2.2 Classes of Intermedia
49、te Systems An IS used within CDPD falls into one of three classes: a. Mobile Data Intermediate Systems (MD-ISS), which are covered in b. Non-Border Intermediate Systems that are used within a domain for normal routing. These ISS route NPDUs between MD-ISS, between MDBS and MD-IS, between MDBSs, and to and from other ISS. Border Intermediate Systems, and F-ESs. c. Border Intermediate Systems (BISs) that implement inter-domain routing protocols (in addition to non-border routing protocols). BISs route NPDUs to and from MD-ISS, ISS, other BISs and F-ESs. A topic for future
