1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.115 Amendment I (I 0/96) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CATI ON Public data networks - Network aspects Definition of address translation capability in public data networks Amendment ? :
2、 Refinements ITU-T Recommendation X.115 - Amendment 1 (Previously CCITT Recommendation) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATION PUBLIC DATA NETWORKS Services and facilities Interfaces X.1-X. 199 X.1-X.19 X.20-X.49 1 Transmission, signalling and switchinn X.50-X.89
3、Maintenance Administrative arrangements OPEN SYSTEM INTERCONNECTION Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protocol specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing INTERWORK
4、ING BETWEEN NETWORKS General Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS Networking Efficiency Naming, Addressing and Registration Abstract Syntax Notation One (ASN.1) OS1 MANAGEMENT Systems Management framework and architecture Management
5、 Communication Service and Protocol Structure of Management Information Management functions SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X. 150-X. 179 X. 180-X. 199 X.2OeX.299 X .200-X. 209 X.210-X.219 X.220-X.22
6、9 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.280-X.289 X.290-X.299 x.300-x.399 x.300-x.349 x.350-x.399 X.400-X.499 X.500-X.599 X.600-X.699 X.600-X.629 X.630-X.649 X.650-X.679 X.680-X.699 X.700-X.799 X.700-X.709 X.710-X.7 19 X.720-X.729 x.730-x.799 X.800-X.849 X.850-X.899 X.850-X.859 X.860-X.8
7、79 X.880-X.899 X.900-X.999 For furher details, please refer fo ITU-T List of Recommendations. FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT). The IT-T is responsible for studying technical, operating and tariff que
8、stions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Rec
9、ommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). Amendment 1 to ITU-T Recommendation X. 1 15 was prepared by IT-T Study Group 7 (1993-1996) and was approved under the
10、 WTSC Resolution No. 1 procedure on the 5th of October 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be
11、reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the . Recommendation X.115iAmd.l (10/96) 1 STD-ITU-T RECMN X.LL5-ENGL L77b 48b257L Ob29825 T9b SUMMARY Recommendation X. 1 15 provides definition of
12、address translation service, the service provided to its customers, the functions at the network interface and functions within the network when providing this service. The, address translation service provides customers with the abiliv to use addresses in formats other than X.121 or E.164 (e.g. use
13、r-friendly addresses like mnemonic addresses, etc.). The addresses can be any of the alternative addresses (e.g. IP addresses, MAC addresses, etc.). The network will translate the address used during call establishment to the desired address to complete the call. 11 Recommendation X.llS/Amd.l (10/96
14、) STD-ITU-T RECMN X=LLS-ENGL L77b W 48b257L Ob2782b 722 Amendment 1 to Recommendation X.115 DEFINITION OF ADDRESS TRANSLATION CAPABILITY IN PUBLIC DATA NETWORKS AMENDMENT 1 Refinements (Geneva, 1996) 1) Change the last two sentences in the executive summary to read as, - IIows: The addresses can be
15、any of the alternative addresses defined in Recommendation X.25. The network will translate the address during call establishment to the desired address to complete the call. 2) Introduction, add the following paragraph at the end of the “Introduction ; References to Recommendation X.25 are for illu
16、strative purposes only. This Recommendation is also applicable in other data networking environments (e.g. Frame Relay, ATM). 3) Clause 4, change Fi&re I as follows: in Call Set-up message or Clear in the case of Call Deflection Network V /- Address Resolution Entity - Server Aitemative Address 61 o
17、f Terminai 6 Terminal A b B1 translated to b by ARE Teminal B T072509Ck9WdOl X.121/E.l64Address ofTemiinal B FIGURE 1K115 Address translation senice 4) Clause 5, Indpuragraph, rewrite as follows: The DCE, on receipt of a call set-up message or clear message in the case of call deflection containing
18、an alternative address, is required to translate the alternative address to the format defined in Recommendations X. 12 1 or E. 164 as the basis on which to route the call. Recommendation X.llS/Amd.l (10/96) 1 STDmITU-T RECMN X-115-ENGL 197b m qb257L b29827 8b9 5) Clause 5, 3rdparagraph, jrst senten
19、ce, rewrite as follows: As shown in Figure 5, DTE A wishes to communicate with DTE B and uses the alternative address of DTE B in the call Set-up message. 6) Clause 5, 4th paragraph, fourth bullet item, rewrite as follows: 0 Invocation Procedures: DTE A uses the altemative address of DTE B in approp
20、riate messages. This may result in the DCE making a query of the ARE for the translation of the alternative address. 7) Subclause 7.2, redraw Figure 7 as follows: Alternative (Note) address N1 in the Call Set-up message DTE X DTE B DTE C T072510CL961602 NOTE - An altemative address “1” is translated
21、 to one of a number of X.121 or E. 164 address (e.g. a, b and c) to reach DTE A, B or C, respectively. FIGURE 7K.115 l-to-N address translation 8) Subclause 7.3, jrst paragraph, rewrite the first sentence as follows: As the name suggests, the alternative address has a global significance and is tran
22、slated to a specific X.121 or E.164 address no matter where that alternative address is used at a given point in time (Le. any DTE may use this alternative address) in a call Set-up message or clear message in the case of call deflection. 2 Recommendation X.115/Amd.l (10/96) 9) Clause 7, redraw Figu
23、res 8 and, 9 as follows: Alternative address N1 in , the Call Set-up message Alternative address N1 in the Call Set-up message DTE X DTE B the Call Set-up message DTE C NOTE - The alternative address “1” is translated to a specific X.121 or E.164 address (Le. x) to reach DTE X regardless of the inte
24、rface used. FIGURE 8X. 115 Alternative address with global significance Alternative (Note) address N1 in the Call Set-up A* DTE X Translation :i-: J DTE B T072512k9Wd04 NOTE - Alternative address N1 translated to X.12 1 or E.164 address a between 9:OO and 17:OO hours. Alternative address N1 translat
25、ed to X.121 or E.164 address b at other times during the day. FIGURE 9K.115 An example of time-ofday translation which is of the form 1-to-N translation 1 O) Subclause 7.3, change the existing “Note to “NOTE 1 ” and add a new NOTE 2 as follows: NOTE 2 - Some networks may also provide an interface-sp
26、ecific address translation capability. This capability, which provides for translation of an alternative address based on information local to an interface, is not discussed in this Recommendation since it does not make use of the procedures discussed in clauses 5 and 6. Recommendation X.1 lS/Amd.l
27、(10/96) 3 1 1) Appendix I, redraw Figure i. 1 as follows: Access Protocol ARP T072513096ld05 ARP Address Resolution and Registration Protocol IARE Inter-Address Resolution Entity Protocol FIGURE I.lK.115 Functional view of address translation service 4 Recommendation XllS/Amd.l (10/96) - - STD=ITU-T
28、 RECMN X*LIS-ENGL L77b 9 48b257L Ob27830 353 D Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Z ITU-T RECOMMENDATIONS SERIES Organiza
29、tion of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and m
30、edia, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant M
31、aintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line netw
32、orks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages STD.ITU-T RECMN X-ILS-ENGL L97b 48b259L Ob2983L 27T m Printed in Switzerland Geneva, 1997
