ATIS 0300011-2011 Next Generation Interconnection Interoperability (NGIIF) Reference Document Part III Installation and Maintenance Responsibilities for SS7 Links and Trunks.pdf
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1、 ATIS-0300011 Next Generation Interconnection Interoperability (NGIIF) Reference Document Part III, Installation and Maintenance Responsibilities for SS7 Links and Trunks Version 12.0 ATIS is the leading technical planning and standards development organization committed to the rapid development of
2、global, market-driven standards for the information, entertainment and communications industry. More than 200 companies actively formulate standards in ATIS Committees, covering issues including: IPTV, Cloud Services, Energy Efficiency, IP-Based and Wireless Technologies, Quality of Service, Billing
3、 and Operational Support, Emergency Services, Architectural Platforms and Emerging Networks. In addition, numerous Incubators, Focus and Exploratory Groups address evolving industry priorities including Smart Grid, Machine-to-Machine, Connected Vehicle, IP Downloadable Security, Policy Management an
4、d Network Optimization. ATIS is the North American Organizational Partner for the 3rd Generation Partnership Project (3GPP), a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications Sectors, and a member of the Inter-American Telecommunicati
5、on Commission (CITEL). ATIS is accredited by the American National Standards Institute (ANSI). For more information, please visit www.atis.org. Notice This document was developed by the Alliance for Telecommunications Industry Solutions (ATIS) sponsored Next Generation Interconnection Interoperabili
6、ty Forum (NGIIF). The NGIIF addresses next-generation network interconnection and interoperability issues associated with emerging technologies. Specifically, it develops operational procedures which involve the network aspects of architecture, disaster preparedness, installation, maintenance, manag
7、ement, reliability, routing, security, and testing between network operators. In addition, the NGIIF addresses issues which impact the interconnection of existing and next generation networks and facilitate the transition to emerging technologies. All changes to this document shall be made through t
8、he NGIIF issue resolution process Note Regarding Previous Versions The NIIF Reference Document was formerly known as the Network Operations Forum (NOF) Reference Document. The NOF Reference Document was published and maintained by Bellcore. The last version of the NOF Reference Document is Issue 13.
9、 Disclaimer and Limitation of Liability The information provided in this document is directed solely to professionals who have the appropriate degree of experience to understand and interpret its contents in accordance with generally accepted engineering or other professional standards and applicabl
10、e regulations. No recommendation as to products or vendors is made or should be implied. NO REPRESENTATION OR WARRANTY IS MADE THAT THE INFORMATION IS TECHNICALLY ACCURATE OR SUFFICIENT OR CONFORMS TO ANY STATUTE, GOVERNMENTAL RULE OR REGULATION, AND FURTHER NO REPRESENTATION OR WARRANTY IS MADE OF
11、MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR AGAINST INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. ATIS SHALL NOT BE LIABLE, BEYOND THE AMOUNT OF ANY SUM RECEIVED IN PAYMENT BY ATIS FOR THIS DOCUMENT, WITH RESPECT TO ANY CLAIM, AND IN NO EVENT SHALL ATIS BE LIABLE FOR LOST PROFITS OR OTH
12、ER INCIDENTAL OR CONSEQUENTIAL DAMAGES. ATIS EXPRESSLY ADVISES THAT ANY AND ALL USE OF OR RELIANCE UPON THE INFORMATION PROVIDED IN THIS DOCUMENT IS AT THE RISK OF THE USER. ATIS-0300011, NGIIF Reference Document, Part III, Installation and Maintenance Responsibilities for SS7 Links and Trunks, Form
13、erly NIIF 5018 The NGIIF Reference Document, Part III, Installation and Maintenance Responsibilities for SS7 Links and Trunks is an ATIS standard developed by the NGIIF Published by Alliance for Telecommunications Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005 Copyright 2011 by
14、 Alliance for Telecommunications Industry Solutions All rights reserved. 2 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For information contact ATIS at 202.628.6380. ATIS is online at
15、 . Printed in the United States of America. 3 INSTALLATION, TESTING The architecture with ASP STPs connected to ASC STPs (Figure 1) requires three-way physical diversity of CCS link facilities. The architecture with ASP STPs connected to ASC SPs (Figure 2) requires two-way physical diversity of CCS
16、link facilities. Three-way physical diversity between ASP STPs and ASC STPs means that no two failures should simultaneously disable all three physical diverse link sets1between ASP STPs and ASC STPs (see Ex. Figure 1). _ 1A (signaling) link set is a set of signaling links directly connecting two si
17、gnaling nodes. 9 Two-way physical diversity between ASP STPs and ASC SPs means that no single failure should simultaneously disable both two physically diverse link sets between ASP STPs and ASC SPs (see Ex. Figure 2). Figure 1 - STP to STP Interface (Example) STP LINK CONFIGULATION B LINKS C LINKS
18、D LINKS Figure 2 - STP to SP Interface (Example) In general, n-way diversity between two portions of a network connected by multiple link sets means that no instance of (n-l) or less simultaneous failures will cause there to be no available link set between the two portions. ASPCCCBDDASCBDASPASC SPD
19、iversit y Considerat ionsNet wor k Access-STP Processor-A-Link Interface-A-Link TransportSTPASPSTPASC10 To avoid common cause failures (i.e., single failures that disable more than one link set), ideally link sets should not share common resources (e.g., electronic equipment), and wherever possible,
20、 should be physically separated. 2.6.1 Other Considerations CCS/SS7 route diversity, which assumes a network architecture that encompasses interconnecting mated STPs, is defined as signaling link sets that are on physically and electrically separate routes; exceptions to this guideline may apply to
21、building entrances, circuit distribution frames, power plants and some remote signaling points. 2.6.2 A-Link Concentrators for Local Service Providers (LSPs) LSCs/LSPs using A-Link Concentrators (ALCs) in their network are strongly encouraged to employ the mated pair architecture. If the LSCs/LSPs e
22、lect to use other architectures (Stand-Alone or Dual Access) and full point code routing (non-cluster routing) is utilized, the maximum number of subtending SPs should be negotiated between the operator of the ALC and the operator of the STP to minimize network management messages. 2.6.3 CCS Link In
23、terconnectivity Physical Link diversity is achieved first in the provisioning process and then maintained by operational procedures. When SS7 link facilities are leased it is the responsibility of both the user and the provider(s) to validate diversity. For example, if hypothetical company X leases
24、SS7 link facilities from separate companies Y and Z, company X may assume the facilities, for the SS7 links, to be diverse per NGIIF recommendations. However, company Z may also lease facilities from company Y, possibly resulting in company Xs SS7 link facilities not meeting NGIIF diversity validati
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