DDN business Diagram

△ What is DDN
DDN 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 through optical fiber cables to form a network topology. users' terminal devices are connected through the data terminal unit DTU) connect to the nearest node.
Advantages of △ddn
-- High transmission quality, low latency, and self-changing Communication Rate.
-- Routes are automatically rolled back to ensure high availability of the circuit.
-- Transparent transmission, supporting data, images, voice, and other multimedia services.
-Establish a Virtual Network VPN easily) and establish your own network management center.
-- High transmission quality. The backbone transmission of DDN is optical fiber transmission, which ensures high speed and security.
-- Use point-to-point or point-to-point dedicated data lines, especially for users with large business volume and strong real-time performance.
-- The Network Management Center can centrally monitor network devices in a graphical manner. The computer automatically performs circuit connection, testing, alarms, and routes, making network management intelligent, reduce Unnecessary human errors.

△Ddn Networking Mode

△ DDN business functions
-- Point-to-point communication
-- Point-to-point multi-point communication
Broadcast Communication: the host sends messages to multiple remote terminals at the same time. Applicable to securities publishing quotations, information publishing, and bulletin board.
Round-Robin communication: multiple remote terminals communicate with the host through Contention or polling. It is suitable for communication between various session and query remote terminals and the central host, such as civil aviation ticketing, bank savings outlets, and the Internet of IBM's SNA networks.
-- Voice Transmission
Supports 64 KPCM, 32KADPCM, 16 kbps \ 8 kbps and other voice transmission. It is suitable for users who need remote hotline calls or multiplexing of voice and data transmission.
△Ddn Application Scope
-- Data transmission, image transmission, and voice transmission.
-- Internet of tickets for Civil Aviation and railway stations.
-- Bank network.
-- Stock market broadcast and trading.
-- Information Database Query System.
-- Smart Community.
-- Any computer network communication.
△Ddnleased line Internet Service
Connect to CHINANET through the ddnleased line. The access rate is 9.6K-2 m or higher. The leased line is stable and can obtain real internet ip addresses, so that enterprises can establish websites on the INTERNET, establish a corporate image, and serve customers. The most common is to connect a vro to a local IDC router through a ddnleased line. In this leased line access mode, the data Bureau generally assigns 16 fixed internet ip addresses to users. After the network is connected, all terminals and workstations on the internet can enjoy the Internet services of all international computers. The device connection diagram is as follows;