Meru Networks部分案例

SBC的歷史表明，有幾家公司參與了為運營商和企業(yè)創(chuàng)建和推廣SBC細分市場。最初的面向運營商的SBC公司（或者是因為已經(jīng)收購或已經(jīng)解散了幾家）：Acme Packet（由Oracle Corporation于2013年收購），Cisco Systems，Kagoor Networks（2005年被Juniper Networks收購，提供路由器 - 集成解決方案），Jasomi Networks（由Ditech Communications于2005年收購，現(xiàn)稱為Ditech Networks），Netrake（2006年由Audiocodes收購[5]），Newport Networks（現(xiàn)已停業(yè)），NexTone（首次與Reef Point合并至形成Nextpoint，后來被Genband收購），Aravox（2003年被阿爾卡特收購并終止）和Emergent Network Solutions（2006年被Stratus Technologies收購，2009年被分拆為Stratus Telecommunications），Sonus Networks，Patton Electronics，Veraz Networks合并2010年，Dialogic與Dialogic公司，Cirpack，Data Connection于2009年更名為Metaswitch，以及Nable Communications。根據(jù)RFC 3261（SIP）和許多其他相關(guān)RFC的作者Jonathan Rosenberg的說法，Dynamicsoft實際上與Aravox一起開發(fā)了第一個工作SBC，但該產(chǎn)品從未真正獲得市場份額。。 2004年5月，紐波特網(wǎng)絡(luò)首次在倫敦證券交易所的AIM上市（NNG），而思科自1990年以來一直在公開上市.Acme Packet于2006年10月在納斯達克上市。隨著收購范圍的縮小，NexTone與Reefpoint合并成為Nextpoint，后來由Genband于2008年收購。與此同時，出現(xiàn)了“集成”SBC，其中邊界控制功能被集成到另一個邊緣設(shè)備中。根據(jù)Infonetics Research，思科的CUBE（思科統(tǒng)一邊界元素）企業(yè)和Oracle ACME都是市場上領(lǐng)先的企業(yè)SBC。隨著2017年10月30日GENBAND和Sonus合并創(chuàng)建Ribbon Communications，SBC市場繼續(xù)鞏固 。

VoIP網(wǎng)絡(luò)的持續(xù)增長將SBC進一步推向了邊緣，要求在容量和復(fù)雜性方面進行適應(yīng)。隨著VoIP網(wǎng)絡(luò)的增長和流量的增加，越來越多的會話正在通過SBC設(shè)備。供應(yīng)商正以各種方式滿足這些新的規(guī)模要求。有些人開發(fā)了獨立的負載平衡系統(tǒng)，可以坐在SBC集群前面。其他人使用最新一代芯片組開發(fā)了新的架構(gòu)，使用服務(wù)卡提供更高性能的SBC和可擴展性。2100433B

前言

Chapter 1 Hydrometric Stations

1.1 Hydrometric network design

1.1.1 Purpose of network design and classification of network

1.1.2 Principles for designing a base network

1.1.3 Hydrometric networks in some countries

1.2 Selection and reconnaissance of river reaches for hydrometric stations

1.2.1 Contr01 0f hydrometric stations

1.2.2 Selection of stream gauging reaches

1.2.3 Survey for the stream-gauging reaches

1 3 Establishment of hydrometric stations

1.3.1 Procedures of establishing gauging stations and stream gauging stations

1.3.2 Establishment of the cross section and the base line

Chapter 2 Water Level

2.1 0utline

2.1.1 The base level

2.1.2 Water level Or stage

2.2 Instruments for observing stages

2.2.1 Different types of gauges

2.2.2 Automatic recording systems

2.2.3 Stilling well

2.2.4 Accuracy of water level measurements

2.2.5 Presentation of results of water level measurements

2.2.6 International Standards

2.3 Processing of stage records

2.3.1 Checking the datum level and zero point of the gauge

2.3.2 Computation of mean daily stage

2.3.3 Interpolation of stage records

2.3.4 Plotting stage hydrographs

2.3.5 Making average daily hydrograph tables

2.3.6 Selection of stages for various durations

2.3.7 Inspecting the rationality of stage data

3. 1 Introduction

3.1.1 Purpose

3.1.2 Different methods of discharge measurements

3, 2 Measurement of cross Section

3.2.1 Introduction

3.2.2 Measurement of depth

3.2.3 Position of verticals

3.2.4 Data processing and computation

3.2.5 International standards

3.3 Velocity of flow

3.3.1 Pulsation of the velocity

3.3.2 Velocity distribution

3.3.3 Current meter

3.4 Current meter measurement and discharge computation

3.4.1 Theory

3.4.2 Arrangement of verticals and points for velocity measurement

3.4.3 Duration of measurement

3.4.4 Computation of discharge

3.5 Measurement of discharge by float method

3.5.1 Principle and method of measuring stream flow by a float

3.5.2 Float coefficient

3.5.3 Computation of discharge for surface float method

3.5.4 Computation of discharge from mean velocity by float method

3.5.5 Example of a subsurface float

3.6 Other methods of flow measurement

3.6.1 Dilution (tracer) method of flow measurement

3.6.2 Flow measuring structures

3.6.3 Measurement of discharge by ultrasonic wave method

3.6.4 Electromagnetic method

3.6.5 Flow measurement in hydroelectric station

3.6.6 Limited number of verticals (the h3/2 method)

3.6.7 Moving boat method

3.6.8 Slope area method

3.6.9 The Acoustic Doppler Current Profiler. ADCP

3.6.10 Remarks

3.7 Errors in measurement and computation of discharge

3.7.1 Errors in measuring discharge

3.7.2 Computational error of discharge

3.7.3 Analysis and estimation of the composite error

3.7.4 Error due to reduction

3.7.5 Accuracy of discharge measurements by velocity——area methods

3.7.6 Selection of methods

Chapter 3 Discharge Measurement

Chapter 4 Compilation of Stream Flow Data

Chapter 5 Sediment Observation and Sediment Data Compilation

Chapter 6 Groundwater Monitoring

Chapter 7 Collection of Water Quality Information

REVIEW AND QUESTION

參考文獻

附錄2100433B

VPN Routing and Forwarding (VRF) is a technology used in computer networks that allows multiple instances of a routing table to co-exist within the same router at the same time. Because the routing instances are independent,the same or overlapping IP addresses can be used without conflicting with each other.

VRF---VPN路由轉(zhuǎn)發(fā)實例（VPN Routing & Forwarding Instance）

每一個VRF可以看作虛擬的路由器，好像是一臺專用的PE設(shè)備。該虛擬路由器包括如下元素：

一張獨立的路由表，當然也包括了獨立的地址空間；

一組歸屬于這個VRF的接口的集合；

一組只用于本VRF的路由協(xié)議。

對于每個PE，可以維護一個或多個VRF，同時維護一個公網(wǎng)的路由表（也叫全局路由表），多個VRF實例相互分離獨立。