No.7信令系统及其在程控交换机中的应用

介绍了Ｎｏ．７信令系统的定义，发展和发展，程控交换机中的Ｎｏ．７信令系统软硬件配置及维护，并分析了不同交换机之间开通Ｎｏ．７信令时遇以的问题及处理方法。     

No.7信令设备测试概况

Ｎｏ．７信令设备测试概况电信总局杨晋儒Ｎｏ．７信令网是三大支撑网之一，为加快Ｎｏ．７信令网的建设速度，保证通信网的统一性、完整性和先进性，邮电部电信总局对网上运行的交换机和Ｎｏ．７信令设备的功能进行了严格的测试。到目前为止，共进行了３０多种机型的消息...     

JA61微型石英谐振器的研制与生产

我们对ＪＡ６１微型石英谐振器进行了研制与生产，频率范围：３０－８７ＭＨＺ，采用ＡＴ切三次泛音振动模式；外形尺寸：７．７×７．７×３．０（ｍｍ）和７．７×６．６×３．０（ｍｍ）；壳型：ＵＭ－１型和ＵＭ－５型。本文给出了该产品的设计依据和电参数测试结果。     

ErLaP_5O_（14）非晶上转换发光分析

测量了Ｅｒ０．１Ｌａ０．９Ｏ１４非晶在６４９．０ｎｍ脉冲染料激光泵浦下的上转换荧光谱线（５５２．２，５４５．７，５４２．９）ｎｍ，５２５．０ｎｍ．４６８．８ｎｍ，４５２．２ｎｍ．（４１１．２，４０７．０）ｎｍ，３８４．１ｎｍ．３８０．７ｎｍ，其中（５５２．２，５４５．７，５４２．９）ｎｍ，（４１１．２．４０７．０）ｎｍ．３８４．１ｎｍ话线是共振步进双光子吸收导致的，而４６８．８ｎｍ．４５２．２ｎｍ，３８０．７ｎｍ是三光子荧光。     

我国No.7信令测试工作概况

我国Ｎｏ．７信令测试工作概况邮电部电信总局张国珍随着新技术的日新月异，Ｎｏ．７信令技术已在我国电话网全面应用。中国Ｎｏ．７信令的应用是通过４个步骤来实现的。首先是由科研部门制定了中国Ｎｏ．７信令的技术标准和Ｎｏ．７信令网的技术体制；其二是与各个不同交...     

No．7信令网建设与维护中需要注意的问题

结合天津本地电话网的实际，阐述了在Ｎｏ．７信令网的通信与维护工作中需要注意的问题，对Ｎｏ．７信令的ｌｅｖｅｌ３的功能作了介绍，指出了建设和维护好Ｎｏ．７信令网，对于提高电信网的运行质量和效率有十分重要的意义。     

7GHz微波频道（2＋1）的配置

７ＧＨｚ微波频道（２＋１）的配置贾汉中７．１～７．４ＧＨｚ及７．４～７．７ＧＨｚ３４Ｍｂｉｔ／Ｓ数字微波接力通信系统，其总体设计中一般注明“本系统为（１＋１）系统”。为了抑制组合干扰和收发干扰，在选用主、备用波道频率时，应采用Ⅰ、Ⅲ，Ⅱ、Ⅳ，Ⅲ、Ⅴ波...     

S1240No.7信令系统维护点滴

随着通信技术的迅猛发展，Ｎｏ．７信令系统得到了广泛的应用，对维护人员的技术水平也提出了新的要求。笔者就Ｓ１２４０（５Ｘ版）在Ｎｏ．７信令系统中的常见故障处理小结如下。１．Ｎｏ．７信令链路对传输质量要求较高，如果传输质量不稳定，链路状态便会自动翻转，由...     

量子阱Ge0.3Si0.7／Si／Ge0.3Si0.7在阱平面方向上的电子能带色…

采用经验赝势方法及界面边界条件，计算了生长在Ｇｅ０．。３Ｓｉ０．７衬底上的导带电子量子阱Ｇｅ０．３Ｓｉ０．７／Ｓｉ／Ｇｅ０．３Ｓｉ０．７的电子束缚能级，对它们在阱平面方向上的色散关系进行了讨论。     

浅谈S—12J型机的NO.7信令系统

本文介绍了Ｓ－１２型机的ＮＯ．７信令系统及其与Ｅ型机５Ｘ版本在功能模块，人机命令，数据库等方面的区别，此外，作者还结合实际介绍了７Ｘ版ＮＯ．７信令新局向创建与删除的具体方法。     

Traffic routing and link dimensioning in the common channel signaling networks

Signaling can be defined as the exchange of information specifically concerned with the establishment and control of connections, and with network management, in a telecommunications network. It constitutes the command/control infrastructure of the modern telecommunications networks. The Common Channel Signaling (CCS) network not only forms the foundation for control and management in the modern telecommunications environments but also provides database transaction processing capability for special services such as the 800 Service and Alternate Billing Service (ABS). The CCS network is the backbone for providing the Integrated Services Digital Network (ISDN) signaling, the Advanced Intelligent Network (AIN) services, and the Personal Communications Service (PCS). It is therefore critical to provide adequate switching and transmission (link) capacities so that performance of CCS networks can be ensured. This paper describes a flexible link set dimensioning algorithm for supporting CCS network and traffic engineering. We first show that increasing a link set by one or more links may not always increase the link set capacity accordingly because of the current routing procedure defined in the Signaling System No. 7 (SS7) protocol. We then demonstrate a theorem that enables us to construct the number of all possible meaningful links in a CCS link set. Based on the theorem, an efficient and flexible procedure for implementing the link dimensioning algorithm in software is devised to support the mechanization of the CCS network planning traffic engineering functions. Finally, we show an approach to improve the CCS link utilization efficiency and its sufficient and necessary conditions.     

谈攀枝花本地NO.7信令网的规划与组织

随着我国通信建设的大发展，数字电信网也日益扩大和发展，ＮＯ．７信令系统的组建将日趋重要。本文根据攀枝花市本地电话网的实际，对本地ＮＯ．７信令网规划与组织中的网络组成方式、ＬＳＴＰ的设置、信令点编码、信令网的安全可靠等问题进行了探讨。     

Analysis of the link error monitoring protocols in the commonchannel signaling network

Motivated by the excessive link status changes observed in some field operations of the common channel signaling (CCS) network, the authors provide a detailed analysis of the signaling link error monitoring algorithms in the Signaling System No. 7 (SS7) protocol. These algorithms determine when to fail a link due to excessive error rates and when to put a failed link back into service. The analysis shows that, under current SS7 specifications of the error monitoring algorithms, the probability of a signaling link oscillating in and out of service could be high, depending on the traffic load, signal unit size, and the statistical nature of errors (bursty or random). The link oscillation phenomenon could become worse as longer Transaction Capability Application Part (TCAP) messages for transaction-based services (e.g., 800 Service) are carried in the CCS networks. While the risk to the existing network may not be high due to the light loads carried at present, there is still a need to study the error monitoring issues thoroughly     

The Influence of Short Error Clusters on CCS No 7 Link Availability

We observe the Common Channel Signaling (CCS) No 7 link availability under short error bursts or clusters with high bit error rate (BER), and compare it to the availability of CCS No 7 link under equivalent random errors. It is shown that the mean time to changeover of the CCS No 7 link in the case of error clusters is greater than in the case of random errors of same intensity. The reason for this positive impact of short clusters with high BER is the concentration of more than one errored bits in one errored signal unit. In the same time the mean alignment time of CCS No 7 link (that is out of service) is shortest if errors are grouped in rare short error clusters. Hence, the availability of CCS No 7 link increases and frequency of CCS No 7 link oscillations decreases, if errors are grouped.     

MATLAB Link for CCS Development Tools 在DSP系统设计中的应用

阐述了MATLAB Link for CCS Development Tools工具对DSP系统设计的支持，DSP程序设计中的一些关键问题以及实现MATLAB与DSP集成开发环境CCS、目标DSP进行数据交换的三种方式。着重介绍了利用MATLAB Link for CCS Development Tools工具调试TMS320VC5402DSP目标板，实现FIR滤波的程序设计过程。     

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。     

Minimum-cost dimensioning model for common channel signalingnetworks under joint performance and reliability constraints

The common channel signaling (CCS) network using the signaling system no.7 protocol is a special-purpose packet switching network transporting various types of network signaling messages between telephone exchanges and/or network databases. Because of the criticality of the information that is being carried, CCS networks should be highly reliable and provide fast response times. They should be dimensioned with sufficient redundancy so that the performance requirements of the networks are satisfied even when a large number of the network components fail. An efficient method is developed to calculate the joint performance and reliability measure, called performability, between an arbitrarily chosen source-destination pair of signaling points in a CCS network. An iterative optimal dimensioning procedure is developed to minimize the total link cost of the network subject to the required end-to-end performability constraints between the signaling points. Using examples, it is shown that the developed dimensioning method overcomes shortcomings of a conventional link-by-link dimensioning method     

Authenticated Confidential Channel Establishment and the Security of TLS-DHE

Transport Layer Security (TLS) is the most important cryptographic protocol in use today. However, finding a cryptographic security proof for the complete, unaltered protocol has proven to be a challenging task. We give the first such proof in the standard model for the core cryptographic protocol underlying TLS cipher suites based on ephemeral Diffie–Hellman key exchange (TLS-DHE). This includes the cipher suite TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA, which is mandatory in TLS 1.0 and TLS 1.1. It is impossible to prove the TLS Handshake secure in the classical security models of Bellare–Rogaway and Canetti–Krawczyk. The reason for this is that the final Finished messages of the TLS Handshake are encrypted with the session key, which provides an opportunity to distinguish real keys from random values. Therefore we start with proving the security of a truncated version of the TLS Handshake protocol, which has also been considered in previous work on TLS, and give the first proof of this variant in the standard model. Then we define the new notion of authenticated and confidential channel establishment (ACCE), which allows the monolithic analysis of protocols for which a modular security proof is not possible. We show that the combination of the TLS-DHE Handshake protocol and the TLS Record Layer encryption is secure in this model. Since the conference publication of this paper, the notion of ACCE has found many further applications, for example to the analysis of further TLS cipher suites (Krawczyk et al., Crypto 2013; Li et al., PKC 2014), advanced mechanisms like secure renegotiation of TLS session keys (Giesen et al., CCS 2013), and other practical protocols like EMV channel establishment (Brzuska et al., CCS 2013), SSH (Bergsma et al., CCS 2014), and QUIC (Lychev et al., S&P 2015).     

Common channel signaling interface for local exchange carrier tointerexchange carrier interconnection

Issues associated with the interconnection of common channel signaling (CCS) networks are identified. Protocol additions to support exchange access services are discussed. Possible extensions for circuit-switched services beyond basic exchange access, as well as further extensions of Signaling System No.7 to support non-circuit-associated signaling between carriers, are described