1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.796 Corrigendum I (I 0198) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital transmission systems - Terminai equipments - Other terminal equipment Characteristics of a 64 kbitls
2、 cross-connect equipment with 2048 kbit/s access ports Corrigendum I ITU-T Recommendation G.796 - Corrigendum 1 (Previously CCITT Recommendations) STD-ITU-T RECMN G-79b C0RR.L-ENGL 1998 48b259L Ob55008 795 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS IN
3、TERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS INTERNA TIONAL A NA LOGUE CARRIER SYSTEM GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER- TRAN SM I SSI ON SYSTEMS INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CA
4、RRIER TELEPHONE WITH METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TESTING EQUIPMENTS TRANSMISSION MEDIA CHARACTERIS TICS DIGITAL TRANSMISSION SYSTEMS TERMINAL EQUIPMENTS SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION Gen eral Coding of analogue signals by pulse cod
5、e modulation Coding of analogue signals by methods other than PCM Principal characteristics of primary multiplex equipment Principal characteristics of second order multiplex equipment Principal characteristics of higher order multiplex equipment Principal characteristics of transcoder and digital m
6、ultiplication equipment Operations, administration and maintenance features of transmission equipment Principal characteristics of multiplexing equipment for the synchronous digital hierarchv ther t DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G. 1 OO-G. I99 G.200-G.299 G .300-G. 3 99 G
7、. 400-G.449 G ,450-G .4 99 G. 700-G. 799 G.700-G.709 G.710-G.719 G. 720-G. 729 G .730-G. 7 39 G.740-G.749 G.750-G.759 G.760-G.769 G.770-G.779 G ,780-G . 78 9 G.790-G.799 G 800-G.899 G. 900-G. 999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION G.796 CHARACTER
8、ISTICS OF A 64 kbit/s CROSS-CONNECT EQUIPMENT WITH 2048 kbit/s ACCESS PORTS CORRIGENDUM 1 Summary This Recommendation describes the characteristics of a synchronous cross-connect equipment to be used in a synchronized digital network and which cross-connects time slots at 64 kbit/s or yt x 64 kbit/s
9、 to/from any of its 2048 kbit/s access ports. Source Corrigendum 1 to ITU-T Recommendation G.796 was prepared by ITU-T Study Group 15 (1997- 2000) on the 13” of October 1998. Recommendation G.796Kor.l (10/98) 1 STDmITU-T RECMN G*79b CORR-I-ENGL 1998 m 4862593 Ob55010 343 W FOREWORD ITU (Internationa
10、l Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the IT. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations
11、 on thein 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 Recommendations on these topics. The a
12、pproval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In soine areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendatio
13、n, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of
14、a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation,
15、 the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1
16、999 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation G.796Kor.l (10/98) 11 CONTENTS 5. I. 1.7 Defect indication from a
17、 remote equipment. . 5.1.1.8 Reception of AIS in time slot 16 . 64 and y1 x 64 kbit/s signals . 6.2.1 Page 1 1 1 . Recommendation G.796Cor.l (10/98) III Recommendation G.796 CHARACTERISTICS OF A 64 kbit/s CROSS-CONNECT EQUIPMENT WITH 2048 kbit/s ACCESS PORTS CORRIGENDUM 1 (Geneva, 1998) Modih the fo
18、llowing subelauses: 5.1.1.7 Defect indication from a remote equipment This is detected on bit 3 TSO NFAS. Refer to 6. UG.775. 5.1.1.8 Refer to 5.1.UG.775. Reception of AIS in time slot 16 6.2.1 The transfer delay of 64 and y1 x 64 kbit/s signals through a cross-connect equipment should be as small a
19、s possible taking account of buffer sizes. The delay should not exceed 650 ps. 64 and n x 64 kbit/s signals Recommendation G.796Kor.l (10/98) 1 STD-ITU-T RECMN G-79b CORR-L-ENGL 1798 48b2571 Ob55013 052 I . . . . . . . . . . . . . STD-ITU-T RECMN G*?9b CORR=L-ENGL 1996 48b2543 Ob55034 T99 Series A S
20、eries 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 Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expressio
21、n: 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 media, digital systems and networks Audiovisual a
22、nd 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 TMN and network maintenance: international transm
23、ission 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 networks 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 communications Global information infrastructure Programming languages Printed in Switzerland Geneva, 1999
