tia 232

/Seven Layer load balancing devicethe lowest or first layer of the OSI model: Physical layer physical layer including physical network media, is actually wiring, fiber, network card and other used to connect two network communication devices together things. It specifies the mechanical characteristics, electrical characteristics, functional characteristics, and process characteristics between the activation, maintenance, and closing of communication endpoints. Although the physical layer does no

Linux Network Base Cable568A568BLine order: Orange white orange green white blue blue white green brown white brownSwitches, routersSwitches: DLINK, H3C, CISCOA switch is a network device used for the forwarding of electrical signals. It provides a unique electrical signal path for any of the two network nodes that access the switch. The most common switch is the Ethernet switch. Other common telephone voice switches, fiber switches, and so on.Routers: CISCOThe Router (Router) is a device that c

From today onwards, will be exposed to network programming, the platform is Linux, the implementation of the language C language, and finally will implement a simple miniftp server.The main content of the program is: Linux network programming TCP/IP foundation, socket programming, inter-process communication, threading, and practical FTP.1.Iso/osi Reference Model : The Open System Interconnection interconnect model is provided by the OSI (International Organization for Standardization ) The Inte

to the modem through a cable, it must be connected using a AYSNC-TO-DB25 or AYSNC-TO-DB9 adapter. There are more types of synchronous serial ports that can be supported in routers, such as Cisco Systems that can support 5 different types of interfaces, namely eia/tia-232 interface, eia/tia-449 interface, v.35 interface, x.21 Serial cable assembly and EIA-530 int

the series of actions that DTE and DCE double on each circuit. In this layer, the unit of data is called the bit (bit). Typical canonical representatives belonging to the physical layer definition include: Eia/tia RS-232, Eia/tia RS-449, v.35, RJ-45, etc. Second layer: Data link layer (datalinklayer)On the basis of providing the bit-stream service in the physica

redundant power supply, after a power failure, the other power supply can continue to power, does not affect the normal operation of the equipment. In the case of multiple power supply, pay attention to the use of multi-channel mains supply, so that when the line fails, other lines can still power. Support agreements and standards-generally refers to the networking specifications and equipment standards established by the International Organization for Standardization. The 1th, 2nd, and 3rd la

application layer: TELNET,FTP,SMTP,SNMP. OSI: Physical layer: eia/tia-232, eia/tia-499, v.35, v.24, RJ45, Ethernet, 802.3, 802.5, FDDI, NRZI, NRZ, B8ZS Data link layer: Frame Relay, H DLC, PPP, IEEE 802.3/802.2, FDDI, ATM, IEEE 802.5/802.2, "ARP, RARP" Network layer: Ip,ipx,appletalk DDPApplication layer: ftp,www,Telnet, NFS,SMTP,Gateway,SNMP http://blog.cs

devices: terminal hosts and routers; commonly used for DCE devices: Wan Switching Machine, moderm, CSU/DSU. EIA/TIA-232, also known as RS-232, is a public physical layer standard, used to support signal rate up to 64 Kbps of non-balanced circuit. V.24 standard: interfaces between DTE and DCE defined by ITU-T. the cable can work in both synchronous and asynchrono

We may be unfamiliar with the practices and usage of twisted pair wires. For example, it is hard to remember how the standard wire head is implemented. It is also vague to know the cross Line (or direct line) used. Let's talk about some notes. Prerequisites 1. Twisted Pair pin position definition (the crystal head has no clip side, from left to right), as shown in table 1. For Table 1, we only need to remember two points: one is that only one, two, three, and six eight lines are used, and the o

1) General requirements1. each installed cable line should undergo a standardized consistency test, which is the "4 to 100 Ω 6 category Cable Transmission Performance Indicator" of the telecommunications industry association TIA "; ANSI/TIA/EIA-568-B.2-1, that is, "TIA 6 class standard ".2. the horizontal twisted pair link should be installed from the IDF interme

card;Typical protocols, standards and applications: 802.2, 802.3ATM, HDLC, FRAME RELAY;Physical Layer:Main function: Transmit bit stream physical;Typical devices: hubs, repeatersTypical protocols, standards, and Applications: v.35, eia/tia-232.TCP Three-time handshakeFirst handshake: The client sends a SYN packet (SYN=J) to the server and enters the Syn_send state, waiting for the server to confirm;Second

Tags: ports must be Linux network programming purpose cyclic Traffic control STP synchronization contains# # # Osi:open System Interconnection # # #开放系统互联网模型是由ISO国际标准化组织定义的网络分层模型, total seven levels1. Physical layer: Physical definition of all electronic and physical equipment specifications, data transmission unit is bit (b), this layer definition specification has Eia/tia RS-232, RJ-45, etc., is actually

have interfaces. Each Interface has its own name and number. The full name of an interface consists of its type mark and number, which starts from 0. For routers with fixed interfaces (such as Cisco 2500 series) or routers with modular interfaces (such as Cisco 4700 series), only one number is used in the full name of the interface, serial numbers are carried out based on the physical order of the routers. For example, Ethernet0 indicates 1st Ethernet interfaces and Serial1 indicates 2nd serial

1. Which of the following is NOT a required condition for deadlock () A. mutex ConditionsB. Inaccessible NetworksC. Resource deprivationD. Loop waitE. Waiting for possession 2. Write the name of the corresponding OSI model layer on the right according to the concept given on the left. Devices and concepts Name EIA \ Tia RS-232, network card Physical Layer TCP and UDP Tran

To master a protocol, we need to understand it based on it. Here we will analyze the content of the PPP protocol. First, let's take a look at the overview of the PPP protocol. Currently, most analog dial-up connections use PPP as the data link protocol, which has the following features: Error Detection Automatically negotiate network layer addresses CHAP or PAP Authentication Data Compression Meets ISO standards PPP and the serial line Internet Protocol SLIP) are often confusing. SLIP only suppo

"Berkeley socket", can be seen Berkeley for the development of the network of how much contribution.The OSI System Reference model and the TCP/IP system comparison: OSI seven-layer model TCP/IP four layer model Corresponding network protocol Application Layer (application) Application Layer Telnet,ftp,tftp,smtp,http,dns ... Presentation Layer (Presentation) Text: Ascii,ebcdic Graphics: tiff,jpeg,gif,pict sound: Midi,mpeg,quickti

Cisco router configuration can be invoked the next time it starts. Third, run Cisco router configuration A router can only choose one of these two types. Configuring 10S is equivalent to changing the Cisco router configuration, both shown in ASCII text format, so we can easily read and operate. Four, Cisco router's auxiliary port Most Cisco routers are equipped with a secondary port (auxiliary port), similar to the console turbulence, providing a eia/ti