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<p>This International Standard specifies the procedures, formats and</p>
<p>facilities at the Packet Layer for Data Terminal Equipment (DTE)</p>
<p>operating in conformance with ITU-T Recommendation X.25.</p>
<p>Both Virtual Call and Permanent Virtual Circuit modes of</p>
<p>operation are covered.</p>
<p>The Packet Layer protocol specified herein can be used in both</p>
<p>Open Systems Interconnection (OSI) and non-OSI environments.</p>
<p>When used within the context of OSI, the Packet Layer protocol</p>
<p>is encompassed in the Network Layer of the OSI Reference</p>
<p>Model, ITU-T Rec. X.200 | ISO/IEC 7498-1.</p>
<p>This International Standard covers DTE operation at the Packet</p>
<p>Layer when accessing a public or private packet-switched</p>
<p>network conforming to ITU-T Recommendation X.25 by means</p>
<p>of a dedicated path or a circuit-switched connection. It also</p>
<p>covers the additional Packet Layer procedures necessary for two</p>
<p>DTEs conforming to this International Standard to communicate</p>
<p>directly (i.e., without an intervening packet-switched network)</p>
<p>over a dedicated path, a circuit-switched connection, or a local</p>
<p>area network (LAN).</p>
<p>This International Standard also covers private networks that use</p>
<p>ITU-T Recommendation X.25 to connect to packet-switched</p>
<p>public data networks and that may also offer an X.25 interface to</p>
<p>a DTE (see annex A).</p>
<p>To evaluate conformance of a particular implementation, it is</p>
<p>necessary to have a statement of which capabilities and options</p>
<p>have been implemented. Such a statement is called a Protocol</p>
<p>Implementation Conformance Statement (PICS), as defined in</p>
<p>ITU-T Rec. X.290 | ISO/IEC 9646-1. Annex B provides the PICS</p>
<p>proforma in accordance with the relevant guidance given in ITUT</p>
<p>Rec. X.296 | ISO/IEC 9646-7.</p>
<p>The first edition of this International Standard was based on the</p>
<p>1984 CCITT Red Book text of Recommendation X.25. It also</p>
<p>contained the necessary provisions for compatibility with the</p>
<p>earlier 1980 CCITT Yellow Book text of Recommendation X.25.</p>
<p>The second edition was based on the 1988 CCITT Blue Book</p>
<p>text of Recommendation X.25. The third edition is based upon</p>
<p>the 1993 version of X.25. This fourth edition is based on the</p>
<p>1996 version of X.25. Retained within this fourth edition are the</p>
<p>necessary provisions for compatibility with the 1993, 1988, 1984</p>
<p>and 1980 versions of X.25. The differences between various</p>
<p>editions of this International Standard are summarized in annex</p>
<p>C.</p>
<p>CCITT Recommendation X.613 (1992) | ISO/IEC 10588 : 1993,</p>
<p><i>Information technology </i> <i>Use of X.25 Packet Layer Protocol in</i></p>
<p><i>conjunction with X.21/X.21bis to provide the OSI connectionmode</i></p>
<p><i>Network Service</i></p>
<p>CCITT Recommendation X.614 (1992) | ISO/IEC 10732 : 1993,</p>
<p><i>Information technology </i> <i>Use of X.25 Packet Layer Protocol to</i></p>
<p><i>provide the OSI connection-mode Network Service over the</i></p>
<p><i>telephone network</i></p>
Reģistrācijas numurs (WIID)
33080
Darbības sfēra
<p>This International Standard specifies the procedures, formats and</p>
<p>facilities at the Packet Layer for Data Terminal Equipment (DTE)</p>
<p>operating in conformance with ITU-T Recommendation X.25.</p>
<p>Both Virtual Call and Permanent Virtual Circuit modes of</p>
<p>operation are covered.</p>
<p>The Packet Layer protocol specified herein can be used in both</p>
<p>Open Systems Interconnection (OSI) and non-OSI environments.</p>
<p>When used within the context of OSI, the Packet Layer protocol</p>
<p>is encompassed in the Network Layer of the OSI Reference</p>
<p>Model, ITU-T Rec. X.200 | ISO/IEC 7498-1.</p>
<p>This International Standard covers DTE operation at the Packet</p>
<p>Layer when accessing a public or private packet-switched</p>
<p>network conforming to ITU-T Recommendation X.25 by means</p>
<p>of a dedicated path or a circuit-switched connection. It also</p>
<p>covers the additional Packet Layer procedures necessary for two</p>
<p>DTEs conforming to this International Standard to communicate</p>
<p>directly (i.e., without an intervening packet-switched network)</p>
<p>over a dedicated path, a circuit-switched connection, or a local</p>
<p>area network (LAN).</p>
<p>This International Standard also covers private networks that use</p>
<p>ITU-T Recommendation X.25 to connect to packet-switched</p>
<p>public data networks and that may also offer an X.25 interface to</p>
<p>a DTE (see annex A).</p>
<p>To evaluate conformance of a particular implementation, it is</p>
<p>necessary to have a statement of which capabilities and options</p>
<p>have been implemented. Such a statement is called a Protocol</p>
<p>Implementation Conformance Statement (PICS), as defined in</p>
<p>ITU-T Rec. X.290 | ISO/IEC 9646-1. Annex B provides the PICS</p>
<p>proforma in accordance with the relevant guidance given in ITUT</p>
<p>Rec. X.296 | ISO/IEC 9646-7.</p>
<p>The first edition of this International Standard was based on the</p>
<p>1984 CCITT Red Book text of Recommendation X.25. It also</p>
<p>contained the necessary provisions for compatibility with the</p>
<p>earlier 1980 CCITT Yellow Book text of Recommendation X.25.</p>
<p>The second edition was based on the 1988 CCITT Blue Book</p>
<p>text of Recommendation X.25. The third edition is based upon</p>
<p>the 1993 version of X.25. This fourth edition is based on the</p>
<p>1996 version of X.25. Retained within this fourth edition are the</p>
<p>necessary provisions for compatibility with the 1993, 1988, 1984</p>
<p>and 1980 versions of X.25. The differences between various</p>
<p>editions of this International Standard are summarized in annex</p>
<p>C.</p>
<p>CCITT Recommendation X.613 (1992) | ISO/IEC 10588 : 1993,</p>
<p><i>Information technology </i> <i>Use of X.25 Packet Layer Protocol in</i></p>
<p><i>conjunction with X.21/X.21bis to provide the OSI connectionmode</i></p>
<p><i>Network Service</i></p>
<p>CCITT Recommendation X.614 (1992) | ISO/IEC 10732 : 1993,</p>
<p><i>Information technology </i> <i>Use of X.25 Packet Layer Protocol to</i></p>
<p><i>provide the OSI connection-mode Network Service over the</i></p>
<p><i>telephone network</i></p>
