Description
Basic composition of communication network: user terminal (PC, mobile phone), network node (routing and switching), transmission link (optical fiber) Classification of communication network: user activities (mobile, fixed), types of services (telephone, computer data, multimedia), transmission media (wired, wireless), technical system (ATM switching system, circuit switching system, packet forwarding system), application field (military, civil/public, private). Examples of communication networks include fixed telephone network, mobile communication network, ATM network, local area network, IP network, etc. The networks it includes (often referred to as subnets) are: ATM (Asynchronous Transfer Mode) Network, X.25 packet data network, Public Switched Telephone Network, Public Telephone Switched Network) /ISDN (Integrated Service Digital Network), Mobile Communication network/Satellite communication network, FDDI (Fiber Distributed Data Interface), Fiber distributed data interface) ring network, local area network and high-speed backbone core network. The whole network takes the WDM (Wavelength Division Multiplexing) link as the high-speed channel of the core router to form a high-speed information transmission platform and interconnect all subnetworks to form a seamless coverage network. Router: The core device of network interconnection, responsible for forwarding packets and selecting the appropriate transmission path for the packets (a packet is a block of data bits that can be transmitted independently).
Data transmission link: A channel for transmitting data bits at a specified rate and format over a physical medium using certain transmission standards (interface, multiplexing, modulation, encoding, synchronization, frame format).
Classification: Access link (user to network node) (Modem link, wireless link, LAN link), Network link (network node to network node) (frame relay, SDH digital synchronization series, WDM).
Data transmission network: The basic function is to select appropriate transmission links for user service packets through route switching so that the packets can be transmitted to target users quickly and reliably.
The basic content of the transmission: Message (an E-mail, an image)
Session: A sequence of messages in which a large number of messages are exchanged in a certain order. The data transmission network should ensure the reliable, timely and efficient completion of the session process.
Typical data transmission network: packet switched network, ATM network
Circuit switching: Switching technology that directly connects an input physical link to an output physical link upon user request.
Circuit switch: functionally equivalent to a switching matrix.
Features: A physical link is established and dismantled after the communication ends. Both parties monopolize the physical channel during the process.
Transmission has a very short time delay, and both sides are strictly synchronized, so the link utilization efficiency is low.
Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
Company advantage: Supply imported original products, professional production of spare parts
One year warranty, fast delivery time, complete supply !！！
① 24 hours email response (12 hours);
② For shipment outside Asia, please contact the seller.
【 Disclaimer 】
We sell new products and discontinued products, independent channels to buy such special products. Guizhou Yuanmiao Automation Equipment Co., Ltd. is not an authorized distributor, dealer or representative of the products featured on this website. All product names/product images, trademarks, brands and microlabels used on this Website are the property of their respective owners. Descriptions, depictions or sales of products with such names/images, trademarks, brands and logos are for identification purposes only and do not imply any association or authorization with any rights holder. This article is from the official website of Guizhou Yuanmiao Automation Equipment Co., LTD. Please attach this link:http://www.ymdcs.com/Triconex
