A baseband processor for IS-54 cellular telephony

This paper describes the design of a baseband processor for IS-54 North American cellular telephony standard. The effect of diverse circuit impairments on the error vector in digital mode and on the parasitic amplitude modulation in analog mode are analyzed. An analog offset compensation scheme, which takes advantage of the TDMA operation, is presented. The device incorporates a Manchester data decoder for data transmission in analog mode. The messages can be sent via two interfaces to the DSP or μ-processor. The architecture of the digital signal processing chain is discussed. The device is fabricated in a 0.9 μ CMOS technology with an area of 40 mm²     

Signaling System No.7 local exchange deployment

The author examines the deployment of Signaling System No.7 (SS7) from the viewpoint of the local exchange carrier. The three phases of local exchange deployment-service planning and design, local exchange network design, and interconnection design-are discussed in sequence. SS7 is a fundamental change to the infrastructure of the local exchange telecommunications network. The author describes how the backbone network, centered on the signaling transfer points (STPs), is installed first, followed by the local exchange network, and then interconnection to interchange and other networks     

An overview of Signaling System No.7

An overview of Signaling System No.7 (SS7) is presented. The salient features of SS7's network services part (NSP) are described. Functionally, NSP corresponds to the first three layers of the Open System Interconnection (OSI) reference model. The signaling network structures that, in conjunction with the NSP, provide integrated services digital network (ISDN) nodes with a highly reliable and efficient means of exchanging signaling messages are discussed. The nodal capabilities of call control and remote process invocation and management, part of the SS7 user parts, are described. The very stringent performance requirements of signaling systems and their reflection on the critical nature of signaling functions and their real-time exigencies are discussed. The likely evolution of network signaling in the remaining years of the 20th century is discussed     

Signaling System No.7 in corporate networks

Corporate network user requirements are identified. The significance of Signaling System No.7 (SS7), in corporate network as a separate backbone signaling system for implementing a robust, flexible and transparent communication network is discussed. The architecture for a corporate network utilizing enhanced signaling is described. The use of SS7 instead of the integrated services digital network primary rate interface (ISDN PRI) is explored. Some SS7 applications in corporate networks are examined     

Signaling System No.7: a tutorial

A tutorial overview of the salient features of SS7 is provided. Its history is briefly reviewed, and the SS7 network services part (NSP), which corresponds to the first three layers of the Open Systems Interconnection (OSI) Reference Model, is described. Signaling network structures that, in conjunction with the NSP, provide integrated services digital network (ISDN) nodes with a highly reliable and efficient means of exchanging signaling messages are discussed. The nodal capabilities of connection (call) control and remote process invocation and management and other functions of the user parts of SS7 are examined. The very stringent performance requirements of signaling systems, which reflect the critical nature of signaling functions and their real-time exigencies, are stressed. A broad outline of the likely evolution of ISDN signaling systems in the remaining years of this century is sketched     

Performance modeling of Signaling System No.7

The layered performance modeling approach is refined and extended to cover the latest CCITT Blue Book specifications. Specific submodels for the higher-level functional blocks, such as the message transfer part (MTP) level 3, the signaling connection control part (SCCP), the ISDN user part (ISDN-UP), and the transaction capabilities application part (TCAP), are given in a generic way, explicitly. With these submodels, generic models for signaling points and signaling transfer points are constructed. The major functional parts of the layered protocol architecture of SS7 are modeled in a generic way by extended queuing network elements such as full duplex flow controlled links, priority processors, multiple-chain multiple-class traffic streams, or elements for segmenting and reassembling of messages. The analysis of the whole network starts from a global traffic flow analysis, which takes all the different signaling message types, their paths through the network, and the load into account. The overall performance measures, such as end-to-end transfer times, are found from all the component delays. The analytical results have been validated by simulation, revealing a high degree of accuracy     

Signaling System No. 7 ISDN User Part

The integrated services digital network (ISDN) user part of Signaling System No. 7 defines the signaling protocol which supports the establishment, supervision, and release of voice and nonvoice calls over circuit-switched connections between ISDN terminations of digital subscriber access lines. This paper gives an overview of the ISDN user part protocol, as defined in CCITT Recommendations Q.761-Q.766 [1], in terms of the signaling functions and procedures provided to support call and connection control in an ISDN, and in terms of the information elements and signaling messages that are used by the signaling functions in ISDN exchanges to communicate.     

An Overview of Signaling System No. 7

When it was first approved by the CCITT in the 1980 Yellow Book, Signaling System No. 7 was described as "an internationally standardized general purpose Common Channel Signalling (CCS) system:bulletoptimized for operation in digital telecommunications networks in conjunction with stored program controlled exchanges;bulletthat can meet present and future requirements of information transfer (circuit and non-circuit related) for inter-processor transactions within telecommunications networks for call control, remote control, network data base access, and management and maintenance signalling;bulletthat provides a reliable means of information transfer in correct sequence, without loss or duplication." It then consisted of a three-level message transfer part (MTP-for connectionless message transfer), a telephone user part (for analog call setup and control), a data user part (for analog circuit switched data), and a four-level architectural model with a "fuzzy" relation to the OSI seven-layer model. By 1984, in the Red Book, the MTP had matured considerably (especially in the area of congestion control), a new level had been added to provide additional transport functionality (the signaling connection control part or SCCP), an ISDN user part provided call control for digital facilities, and the architectural model had been "adjusted." Future efforts are focusing on cod-to-end ISDN signaling compatibility (harmonization of SS7 andD-channel procedures), non-circuit-related transaction capabilities (e.g., for network database interactions), a complete operations and maintenance application part (OMAP), and a more formal architectural relationship with the OSI model.     

No.7信令监测系统的发展与应用

简要介绍No.7信令监测系统的技术现状、发展前景及应用情况,阐述了No.7信令监测系统在公众电话网（国际国内电话网／智能网等）的网络维护管理工可以发挥的强大功能和多种应用。     

七号信令监测系统的建设探讨

随着国内通信产业的发展,电信运营商网络规模不断扩大,网络质量越来越重要。七号信令监测系统可以准确、有效地获取信令信息,对各种信令协议进行跟踪分析,为信令网管理和维护以及业务质量监测和分析提供了有效的支撑手段。文中分析了七号信令监测系统的原理,对其建设方式进行了探讨。     

ALCATEL E10B No.7信令系统简介

针对我国“九五”期间将在全国推广实行Ｎｏ．７共路信令的现实情况，本文就法国ＡＬＣＡＴＥＬ公司依照邮电部颁布的《中国国内电话网Ｎｏ．７信号方式技术规范》所开发的Ｅ１０Ｂ Ｎｏ．７信令系统的结构、特点和运行测试情况作了较详细的介绍，测试结果反映了Ｅ１０Ｂ Ｎｏ．１７信令系统具有性能稳定、功能较强、操作维护方便等优势。     

利用No.7监测仪表处理几个问题

介绍利用No .7信令监测系统监测交换局的No .7信令 ,及通过呼损分析功能处理一些故障的方法。     

No.7信令系统的安全威胁及其防护

No.7信令系统（SS7）是公用电话网的关键支撑系统,SS7网络最初作为封闭网络来设计的,整个网络由运营商完全控制,各实体高度信任。文章分别针对该系统的信令协议、网络节点和来自外部网络的安全威胁进行了分析,并从协议安全、边界防护和内部安全加固三个方面提出了构建信令系统防护体系的方案。     

No.7信令网络的维护和管理

No.7信令网是现代通信网的重要组成部分,它支持目前整个通信网的所有业务。我国采用的No.7信令网是具有多种功能的业务支撑网,并已建有一套较为完善的网络体系。论文从No.7信令网络结构出发详细介绍了我国目前对No.7信令网络的维护管理工作,比较了No.7信令网管系统和No.7信令监测系统的区别,并对当前网络存在的不足和其面临的困扰进行了简要说明。     

No.7信令集中监测系统

对建立本地网No.7信令集中监测系统的必要性，该监测系统的特点，作用及结构，功能等作了概括性的介绍。     

No.7信令网的网络优化

介绍了天津移动通信公司GSM网络有关No．7信令网的组网结构及网络优化工作经验。     

七号信令集中监测系统的分析与应用

本文主要分析七号信令集中监测系统的结构和功能,以及它在网间互连互通质量管理中的应用。     

七号信令系统SCCP部分的分析与实现

本文通过对SCCP协议两类业务的特点进行具体分析,提出了模块化的实现方法,重点阐述了SCCP路由控制模块.并在工程应用中进行了几点创新,解决了多用户身份识别和闲置连接段及时释放问题.     

西门子EWSD交换机与No.7信令

介绍了目前在移动通信网中使用的西门子EWSD交换机的No．7信令部分,其硬件结构、信令流程及日常维护工作。     

重庆移动七号信令监测系统的组网及应用

文章给出了中国移动重庆分公司建设的七号信令监测系统的总体结构,分析了七号信令监测系统中的信令数据采集点、前端处理器、数据处理与应用、信令数据收敛等网络组成部分,并介绍了实时监测、网间互连、网络优化、用户行为分析等七号信令监测系统在移动通信中的应用.