GB/T 15940-2008 English PDF

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GB/T 15940-2008: Basic multiplexing structure for synchronous digital hierarchy signals
Status: Valid

GB/T 15940: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15940-2008	299	Add to Cart	3 days	Basic multiplexing structure for synchronous digital hierarchy signals	Valid
GB/T 15940-1995	479	Add to Cart	4 days	Basic multiplexing structure for synchronous digital hierarchy signals	Obsolete

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Basic data

Standard ID: GB/T 15940-2008 (GB/T15940-2008)
Description (Translated English): Basic multiplexing structure for synchronous digital hierarchy signals
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M33
Classification of International Standard: 33.040.20
Word Count Estimation: 13,175
Date of Issue: 2008-10-07
Date of Implementation: 2009-04-01
Older Standard (superseded by this standard): GB/T 15940-1995
Quoted Standard: ITU-T G.780-2004
Adopted Standard: ITU-T G.707-2007, NEQ
Regulation (derived from): Announcement of Newly Approved National Standards No. 17 of 2008 (No. 130 overall)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the network node interface (NNI) of the synchronous digital hierarchy (SDH) signal multiplexing structure. This standard applies to public telecommunications networks and dedicated telecommunications network in the SDH system using SDH multiplexing structure and communication system, such as SDH transmission equipment, SDH digital microwave communication equipment.

GB/T 15940-2008: Basic multiplexing structure for synchronous digital hierarchy signals

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Basic multiplexing structure for synchronous digital hierarchy signals ICS 33.040.20 M33 National Standards of People's Republic of China Replacing GB/T 15940-1995 Basic multiplexing structure for synchronous digital hierarchy signals Posted 2008-10-07 2009-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard reference ITU-T Recommendation G. 707.2007 "Synchronous Digital Hierarchy (SDH) network node interface" be revised. This standard replaces GB/T 15940-1995 "basic complex synchronous digital hierarchy signal with structure." This standard GB/T 15940-1995 specific amendments are as follows. a) According to the work of standardization of the relevant provisions of the original standards in Chapter 2, "Normative references" to "normative references" Chapter 3, "term" to "Terms and Definitions", adds another chapter 4 "Abbreviations"; b) update the normative references; c) "Terms and definitions" increased by 3.4 "snap-in group" and 3.6 "branch unit group" of terms and definitions; d) in the 3.2 type of virtual container re-divided, the VC-12 and VC-3 (when mapped to TU3) is defined as low-order virtual Container, the VC-3 (mapped to the AU-3 Shi) and VC-4 is defined as higher-order virtual container; e) an increase in the AUG-N 3.4 "snap-Group"; f) of the original standard 1 "Basic multiplexing structure" was amended to introduce the AUG-N, AU-3 and so on; the original standard 2 "directly from the C-12 by the method of multiplexing the AU-4 ", 3" direct reuse methods from the AU-4 through C-4 "has been revised; g) The original standard 4.2.2.1 "AUG multiplexed into STM-N frame" was changed to 5.3.1.1 "AUG-N multiplexed into STM-N frame" on the The contents of the section has been revised, the original standard Figure 4 "N multiplexed into an AUG STM-N frame" revised Figure 4 "AUG-N Multiplexed into STM-N frame, "and the figure has been revised content; h) increased 5.3.1.2 "AUG-N multiplexed into AUG-4 × N"; i) the original standard 4.2.1.2 "AU-4 multiplexed into AUG" changed to 5.3.2 "AU-4-Nc multiplexed into AUG-N", of their contents The corresponding amendment and the original standard Figure 5 "AU-4 multiplexed into AUG" is amended as Figure 6 "AU-4 multiplexed into AUG-1", Fig. The content has been revised; j) increased 5.3.3 "AU-3 multiplexed into STM-0"; k) of the original standard 8 "seven TUG-2 multiplexed into TUG-3" content has been revised; l) increased 5.4.4 "TUG-2 multiplexed into the VC-3". The standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China. The standard by the China Communications Standards Association is responsible for centralized. This standard was drafted. Ministry of Information Industry Telecommunications Research Institute. The main drafters of this standard. Li Wei, Hu Changjun, Fang, Wang Yu, Zhang Guoying. This standard was first released in December 1995, this is the first revision. Basic multiplexing structure for synchronous digital hierarchy signals

1 Scope

This standard specifies the multiplex structure at the network node interface (NNI) for Synchronous Digital Hierarchy (SDH) signals. This standard applies to public telecommunication networks and private telecommunications systems and the use of SDH SDH multiplexing communication system structure, such as SDH Transmission equipment, SDH digital microwave communication equipment.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. ITU-TG. 780.2004 Synchronous Digital Hierarchy (SDH) network of terms and definitions

3 Terms and Definitions

ITU-TG. 780.2004 define the following terms apply to this standard. 3.1 Containers are (see 3.2) payload information structure comprising the virtual container. For each virtual container has its respective container, currently provided four Standard container C-1, C-2, C-3 and C-4, C-1 and C-11 can be divided into C-12. China's use of the C-12, C-3, C-4 three standard capacity Device, corresponding to the quasi-synchronous system (PDH) standard interface rate 2048kbit/s, 34368kbit/s (44736kbit/s) and 139264kbit/s. 3.2 Virtual container is the information structure used to support path layer connections in SDH, which consists of information payload and path overhead (POH) consisting of a block Frame structure, the frame structure is repeated once every 50μs 125μs or identify VC-n frame start position location services provided by the network layer. Already it provides for two types of virtual container --- Lower order virtual container. VC-n (n = 11,12,2,3), which consists of a single container C-n (n = 11,12,2,3) together with the corresponding lower-order virtual container path overhead (POH) composition. According to the definition of terms 3.5 "branch unit", when the VC-3 TU-3 is mapped to Shi, VC-3 is used as the low order virtual container. China's use VC-12 and VC-3 as the lower-order virtual container. --- Order virtual container Combination of VC-n (n = 3,4), which consists of a single VC-n (n = 3,4) or a tributary unit group (TUG-2 or TUG-3) and the corresponding virtual container Channel overhead (POH) components. According to the definition of terms 3.3 "snap" when the VC-3 is mapped to the AU-3 Shi, VC-3 is a high-end Virtual container. China's use of VC-3 and VC-4 as a high-order virtual container. 3.3 Management unit is adapted to provide the information structure between higher-order channel layer and multiplex section layer, which consists of information payload (order virtual container) and It indicates the payload frame start relative to the multiplex section snap-pointer offset starting composition. There are two snap-in. AU-4 and AU-3. AU-4 together with the VC-4 with respect to the VC-4 indicating STM-N frame phase correction Snap pointer accurate composition, AU-3 by a VC-3 plus instructions VC-3 with respect to the STM-N frame phase alignment of the snap-pointer ......

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