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CSA ISO/IEC 8208 : 2002
M00013819
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CSA ISO/IEC 8208 : 2002
INFORMATION TECHNOLOGY - DATA COMMUNICATIONS - X.25 PACKET LAYER PROTOCOL FOR DATA TERMINAL EQUIPMENT
Canadian Standards Association
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Table of Contents
Foreword<br>1 Scope<br>2 Normative references <br> 2.1 Identical Recommendations - International <br> Standards<br> 2.2 Paired Recommendations - International <br> Standards equivalent in technical content<br> 2.3 Additional references<br>3 General considerations <br> 3.1 Compatibility with versions of Recommendation <br> X.25<br> 3.2 Environments <br> 3.3 Differences in DTE/DTE and DTE/DCE operation<br> 3.4 Operation over circuit-switched connections<br> 3.5 Provision of the OSI Network Service <br> 3.6 External Packet Layer interactions <br> 3.7 Logical channels <br> 3.8 Packet Layer entity <br> 3.9 Packet types<br> 3.10 Procedures for initialization<br>4 Procedures for restart <br> 4.1 Originating a restart request<br> 4.2 Receiving a restart indication <br> 4.3 Restart collision<br> 4.4 Restart confirmation <br> 4.5 Determining "DTE" or "DCE" characteristics <br>5 Procedures for Virtual Call setup and clearing <br> 5.1 Ready state <br> 5.2 Procedures for Virtual Call setup <br> 5.3 Rejecting a call <br> 5.4 Aborting a call request<br> 5.5 Procedures for Virtual Call clearing<br>6 Procedures for data and interrupt transfer <br> 6.1 States for data and interrupt transfer <br> 6.2 Maximum User Duo Field length of DATA packets <br> 6.3 Delivery Confirmation bit<br> 6.4 More Data mark <br> 6.5 Complete packet sequence <br> 6.6 Qualifier bit <br> 6.7 Fragmentation and reassembly of messages <br> 6.8 Procedures far interrupt <br> 6.9 Transit delay of DATA packets <br>7 Procedures for flow control <br> 7.1 Flow control <br> 7.2 Throughput characteristics and throughput <br> classes<br>8 Procedures for reset<br> 8.1 Originating a reset request<br> 8.2 Receiving a reset indication<br> 8.3 Reset collision <br> 8.4 Reset confirmation<br>9 Effects of clear, reset, and restart procedures <br> on the transfer of packets<br>10 Effects of Layers 1 and 2 on the Packet Layer <br>11 Error handling<br> 11.1 The DIAGNOSTIC packet<br> 11.2 Non-receipt of window-rotation information<br> 11.3 Receipt of erroneous DATA packets <br>12 Packet formats <br> 12.1 General <br> 12.2 Call setup and call clearing packets <br> 12.3 DATA and interrupt packets<br> 12.4 Flow control packets<br> 12.5 Reset packets <br> 12.6 Restart packets<br> 12.7 DIAGNOSTIC packet<br> 12.8 REJECT packet<br> 12.9 Registration packets<br>13 Procedures for optional user facilities<br> 13.1 On-line Facility Registration<br> 13.2 Extended and Super Extended Packet Sequence <br> Numbering<br> 13.3 D-bit Modification <br> 13.4 Packet Retransmission<br> 13.5 Incoming Calls Barred<br> 13.6 Outgoing Calls Barred<br> 13.7 One-way Logical Channel Outgoing<br> 13.8 One-way Logical Channel Incoming<br> 13.9 Nonstandard Default Packet Sizes<br> 13.10 Nonstandard Default Window Sizes<br> 13.11 Default Throughput Classes Assignment<br> 13.12 Flow Control Parameter Negotiation<br> 13.13 Throughput Class Negotiation facilities <br> 13.14 Closed User Group related facilities <br> 13.15 Bilateral Closed User Group related facilities<br> 13.16 Fast Select<br> 13.17 Fast Select Acceptance <br> 13.18 Reverse Charging <br> 13.19 Reverse Charging Acceptance<br> 13.20 Local Charging Prevention<br> 13.21 Network User Identification (NUI) related <br> facilities<br> 13.22 Charging Information<br> 13.23 RDA related facilities<br> 13.24 Hunt Group <br> 13.25 Call Redirection and Call Deflection related <br> facilities<br> 13.26 Called Line Address Modified Notification<br> 13.27 Transit Delay Selection and Indication<br> 13.28 Alternative Addressing related facilities<br> 13.29 TOA/NPI address subscription<br> 13.30 Reference Number<br>14 Procedures for optional ITU-T specified DTE facilities <br> 14.1 Calling Address Extension<br> 14.2 Called Address Extension<br> 14.3 Minimum Throughput Class Negotiation <br> 14.4 End-to-End Transit Delay Negotiation<br> 14.5 Priority <br> 14.6 Protection <br> 14.7 Expedited Data Negotiation<br>15 Format for Facility Field in tail setup/clearing <br> packets <br> 15.1 General <br> 15.2 Coding of the Facility Field for optional user <br> facilities<br> 15.3 Coding of the Facility Field for ITU-T <br> specified DTE facilities<br>16 Format for Registration Field in registration packets <br> 16.1 General <br> 16.2 Coding of the Registration Field for <br> registration-facilities<br>17 Diagnostic codes <br>18 Timers and retransmission counts <br>19 State diagrams<br>20 State tables <br>21 Conformance <br> 21.1 Static conformance <br> 21.2 Protocol Implementation Conformance Statement<br> 21.3 Dynamic conformance<br>Annexes<br>A - Private networks <br>B - PICS Proforma <br>C - Differences between various editions of ISO/IEC 5208 <br>D - Abbreviations
Abstract
Specifies the procedures, formats and facilities at the Packet Layer for Data Terminal Equipment (DTE) operating in conformance with ITU-T Recommendation X.25. Both Virtual Call and Permanent Virtual Circuit modes of operation are covered. Covers DTE operation at the Packet Layer when accessing a public or private packet-switched network conforming to ITU-T Recommendation X.25 by means of a dedicated path or a circuit-switched connection. Also covers the additional Packet Layer procedures necessary for two DTEs conforming to this International Standard to communicate directly (i.e., without an intervening packet-switched network) over a dedicated path, a circuit-switched connection, or a local area network (LAN). Also covers private networks that use ITU-T Recommendation X.25 to connect to packet-switched public data networks and that may also offer an X.25 interface to a DTE (see annex A).
General Product Information
| Document Type | Standard |
| Status | Current |
| Publisher | Canadian Standards Association |
| ProductNote | Reconfirmed EN |