ddn obits

1. IntroductionDriven by the national informatization strategy, many industry groups have recognized the importance of informatization. At present, the finance, education, medical care, transportation, electric power, tobacco, logistics and other industries have established their own information systems according to the characteristics and needs of the industry. In order to promote the development of industry informatization, China Mobile gives full play to its own business advantages and closel

I. Network Synchronization There are three methods for network synchronization: quasi-synchronization, master-slave synchronization, and mutual synchronization. Quasi-synchronous according to ITU-T G.811 recommendations, often recommended for international use. Master-slave synchronization synchronizes data by locking the slave clock phase to the reference timing of the master clock. This synchronization can be divided into master-slave synchronization with a number structure and master-slave sy

In the existing data network technology, the multi-service network platform with ATM as the core technology is very suitable for the transformation task of DDN network. DDNDigital Data Network) is a Network that provides Data leased line services for users. DDN is a time-division multiplexing (TDM) transmission technology that provides users with an exclusive end-to-end transparent transmission channel. You

The construction of DDN in China began in early 1990s. As of the beginning, DDN has covered most of the country and showed a good development. The newly opened China Public Digital Data Network DHINADDN is easy to describe) it is widely welcomed by all sectors of the society, especially for customers with high transmission requirements and a large amount of information. It provides customers with services s

Chapter 1: DDN Network: main solutions for large user accessWith the rapid development of China's economy in recent years and the increasing requirements of enterprises for communications, especially data communication, the communication traffic is larger and the business types are richer, at the same time, the flexibility and manageability of the provided services are greatly increased. All these require that telecom operators be able to provide as f

1. Overview General Packet Radio Service (GPRS) is short for universal grouping wireless Service. It is a GSM-based mobile grouping data Service that provides users with IP addresses or X.25 connections for mobile grouping. GPRS adopts the same wireless modulation standard as GSM, the same frequency band, the same burst structure, the same frequency hopping rules, and the same TDMA frame structure) A comprehensive GPRS coverage can be provided by adding function boards and upgrading related soft

I. Network Service category DDN network services are divided into three types: dedicated circuit, frame relay, and compressed voice/G3 fax services. DDN's main business is to provide users with medium and high-speed, high-quality point-to-point and point-to-point digital circuits (dedicated circuits); based on dedicated circuits, the Frame Relay Service Module (FRM) is introduced to provide frame relay services with permanent virtual circuit (PVC) con

1 IntroductionAs a data communication support network, DDN is mainly used to provide users with high-speed and high-quality data transmission channels and provide bridges for their network interconnection. With the economic development of Jiuquan City, China Telecom's DDN has been expanded to the region, which has led to rapid development of data transmission services in the region, including ICBC's data tr

After the completion of the ATM network, how to extend the ATM network, expand potential user needs, and increase the return on investment has become a common problem for operators in various regions. The integration of ATM and DDN effectively solves this problem. With the development of information technology, the demand for data leased line services is increasing, and bandwidth requirements are also increasing. Taking financial industry users as an

1. Simple topology diagramLine import------line entrance (my room core switch)------My server terminal assigned IP101.251.65.33 101.251.65.34 || IP route 101.230.0.0 255.255.0.0 nextop 101.251.65.33Dedicated router2. Border Routing 3945 configurationDefine inside ports and zones (My Computer room intranet interface)Define the outside port and region (My computer room outside the network interface, is also the interface of the line access)Access-list 1 Permit 10.1.11.0 0.0.0.255 (allow intranet s

Two DDN configurations for ISDN backup:Building configuration...Current configuration: 1707 bytes!Version 12.2:Service timestamps debug uptimeService timestamps log uptimeNo service password-encryption!Hostname XXXX!Enable password XXX!Username XXXX password 0 XXXIp subnet-zero!!!Isdn switch-type basic-net3!!!Interface BRI2/0No ip addressEncapsulation pppDialer pool-member 1Isdn switch-type basic-net3Isdn T310 4000Ppp authentication chapPpp multilink!

systems, and information application systems. Compared with DDN Services, it has advantages such as low cost, simple installation, unlimited time, and traffic. 263 data port has advanced technology and a wide range of ISDN trunk line resources can be expanded to 2600 lines). It provides high-speed network channels to provide quality services to users based on their different needs. BytesDDN

△ What is DDNDDN is short for Digital Data Network of Digital Data Network. It is composed of Digital transmission channels such as optical fibers, Digital microwave channels, and satellites and Digital cross-multiplexing devices. It provides users with high-quality Data transmission channels, transmit various data services. Digital Data Network is a trunk network consisting of optical fiber cables. The basic unit of DDN is nodes. nodes are connected

According to the requirements of China's DDN technical system, the basic methods of user access such as, in these basic methods can also adopt different combinations. 1. Second-line analog transmission Allows you to simulate inbound connections. In the exchange mode, you must transmit both the DC loop and the E M signaling of the PBX trunk line. 2. Two-line or four-line communication with MODEM The supported user rate depends on the line length

I. Applicable conditions: 1. DDN is the main line, and PSTN is the standby line. 2. The HDLC protocol is used on DDN and the PPP protocol is used on PSTN. 3. dynamic routing can be performed on the main line or the standby line. In this example, dynamic routing is performed on the main line. II, Network Topology: Iii. Solution description: HDLC support is one of the most impor

DDN (digital data network) is a digital data transmission network composed of digital transmission channels and digital cross-multiplexing devices such as optical fiber, digital microwave or satellite. It can provide users with a variety of high-quality digital data network (DDN Digital Data Network (DDN Road and other new services to meet the needs of users of m

Mentioned in the masterpiece cqcayee :]: Please kindly advise how to configure DDN in CISCO 2611, in addition, I would like to ask you how to restore a wide area network card from an old 2611 with a password), that is, return to the initial setting status. Thank you.:: My mailbox: cqcayee@sohu.com::......A: 1: ddn can encap many protocols. The configuration below is ppp (simple configuration, for reference

Two local networks are connected through DDN. The two CIDR blocks are 192.168.0.0 and 192.168.1.0, respectively. Currently, Windows 98 in 192.168.1.0 must log on to a windows2000 domain in 192.168.0.0 through two routes. For the configuration of the bridge and help address, see the configuration of the routing Bridge in the essence area. However, it is found that the address of s0 and fa0 cannot always be the same network segment, then, set the ip a

Advantages of VPN TechnologySecurityVPN: very high, protecting the integrity, confidentiality, and non-repudiation of data transmission; security control is in the hands of users;DDN: relatively high. However, security is built on the trust of the Telecom Department, and there is no security for telecom operators.ScalabilityVPN: Based on the TCP/IP technology, the access method is flexible, as long as the network is reachable, it can be easily expande