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Oracle Database Center Dual Live path: ASM vs VPLEX

participated in the database implementation and operation of Vplex bi-active and ASM double-live, and has a practical experience to talk about the two current dual-activity programs.First, we talk about the main differences between extended RAC and common RAC. Mainly distance, distance is to prevent such as natural disasters, terrorist attacks and other data center damage, another database center can still provide services. However, the distance will bring additional network and IO delay, so th

How to quickly determine the cause of optical fiber failure

electrical port and network device interface, or both ends of the device interface duplex mode mismatch. 2 Twisted-pair cable and RJ-45 head have problems, to detect 3 Fiber connection problem, jumper is alignment device interface, tail fiber and jumper and coupler type match etc. 5. Optical transceiver Connection After the two ends can not communicate 1 fiber connected to the reverse, TX and RX-Connected fiber swap 2 RJ45 interface and external

Guidelines for Design and Application of Industrial interface RS-485

characteristic impedance Z0 of the transmission line cable. The RS-485 is recommended to use a 120 Z0 cable, so each end of the cable is usually used 120 resistance for end-to-end connection. Figure 4: RS-485 end-to-end using common mode noise filter. Applications in a noisy environment often use two RC low-pass filters to replace these 120 resistors to enhance the filtering of common-mode noise (see figure 4 ). It is worth noting that the resistance values of the two filters should be equal

High-density and highly integrated otn wavelength-division transmission system

High-density and highly integrated OTN Wavelength-Division transmission SystemThis wave division multiplexing technology in the heyday, a variety of new technologies emerge. The goal is the same, that is to meet the network era of the operators. Long long ago, can only use CWDM coarse wave points, channel number is not enough to say, transmission distance is also very limited, line and equipment attenuation calculation,10G no relay transmission Kilo

Four Methods for connecting networks to the Internet

). Note that the IP addresses of the two APS must be in the same CIDR Block and the same channel can be used to achieve wireless connection and resource sharing between the two wired LAN networks, or expand the wired network. It should be noted that both APs adopt oriented antennas. Opinion 2: Use optical fiber Many netizens have agreed to this solution, because the current price of fiber optics is also more than 10 pieces per meter, and the cost of pulling fiber cables between two points is no

Networking Solution: engineering experience summarized in network construction

work of other nodes;G. Twisted Pair wires are generally not installed outdoors. When a small part is installed outdoors, the casing should be installed in the outdoor part;H. Select the eight-core twisted pair wires. When you install the connectors on your own, the eight wires should be installed properly. Do not install only four wires or cut off the other four wires.Iv. Network Device InstallationHub InstallationA. the hub should be installed in a dry and clean room;B. The Hub should be insta

Design and implementation of Ethernet optical wireless communication system

, to meet the needs of data communication, has a strong application value. 1 Ethernet-based laser wireless communication system The combination of Ethernet and laser wireless communication can give full play to the advantages of the two systems and improve the application range and reliability of the system greatly. Fig. 1 is a schematic diagram based on one end of the Ethernet laser wireless communication system, and the other end of the structure and the end of the symmetrical state. From

RS-485 Interface Circuit Guide (TI:SLLA036D)

termination resistor.Figure 2 shows an example of the SN75LBC176A transceiver Unit load calculation. Because the device integrates the drive and receiver together to form the transceiver (that is, the driver output and receiver inputs are connected to the same bus), it is difficult to obtain the drive leakage current and receiver input current separately. For ease of calculation, the receiver input impedan

Master high-end switch cascade to instantly become a master of the Network

Master the high-end switch cascade to instantly become a master of the network, previously introduced the relevant knowledge. After the publication of the stack and cascade of switches, we have received a number of emails from many readers to discuss with us about the cascade of switches. So we will introduce some related content about high-end switch cascade. High-end switch cascade: optical transceiver connection When optical cables are used for cab

Detailed explanation of wiring construction requirements

unplug the twisted pair cable, which does not affect the work of other nodes;G. Twisted Pair wires are generally not installed outside the room. When a small part is installed outside the room, casing should be installed in the outdoor part;H. Select the eight-core twisted pair wires. When you install the connectors on your own, the eight wires should be installed properly. Do not install only four wires or cut off the other four wires. Iv. Network Device Installation Hub InstallationA. the Hub

Cisco CCNP training diary full contact

layer, frame-based and VLAN-based access control, and RACL on the third layer;City Ethernet:A private VLAN is a Cisco proprietary technology. It is used to isolate hosts in the same VLAN. The management is complex and the scalability is poor;PVLAN can be divided into the primary VLAN and the secondary VLAN. The secondary VLAN can be divided into the isolated VLAN and the ac vlan;PVLAN port: public port, isolation port, and AC port. The isolation port can only communicate with public ports (only

Working principle of fiber optic cat

Light Cat is "optical modem", refers to the optical Ethernet signal into other protocol signal transceiver equipment, but also plays the role of modulation and demodulation. The optical cat is also known as a single port optical transceiver, which acts as a relay transmission device for the local network, and is suitable for the optical terminal transmission equipment of the base station as well as the leas

[Contiki series of papers 4] Contikimac RDC Protocol

Directory Directory Summary Introduced Contikimac 1 Contikimac Timing 2 packet detection and fast sleep 3 Phase Lock Transmission Realize Evaluation 1 Micro Benchmark 2 Network Power consumption Related work Summarize Reference documents SummaryTo reduce system power consumption, a low-power wireless device must shut down the radio as much as possible, but in order to receive communication messages

Implementation framework and Application of ethtool in Linux

data, the MAC protocol can determine whether data can be sent in advance. If data can be sent, it adds some control information to the data, and finally sends the data and control information to the physical layer in the specified format; when receiving data, the MAC protocol first checks the input information and determines whether a transmission error has occurred. If there is no error, the control information is removed and sent to the LLC layer. Ethernet MAC is defined by IEEE-802.3 Etherne

"Turn" support and implementation of Linux network card driver for Ethtool

whether the data can be sent, if it can be sent to the data with some control information, and finally the data and control information in the specified format sent to the physical layer, when the data is received, the MAC protocol first to determine the information entered and whether transmission error occurred, If there is no error, the control information is removed and sent to the LLC layer. Ethernet MAC is defined by the IEEE-802.3 Ethernet standard.The physical layer PHY is a physical in

Internet Bar Fiber Access scheme

situation of Internet cafes users, the main link is worth the Internet Café users reference, we recommend the first way. The first is the use of optical fiber transceiver to achieve the connection between the fiber and the dual-Wan port router, this way the biggest feature is the low input cost, but also the most suitable for Internet users a way. In the choice of fiber transceiver, the performance is of

How to construct the access Layer optical cable network

cable access distance, improve access to bandwidth, to achieve universal user width with business access. For a small number of large customers high bandwidth access requirements (such as 10M, 20M or more bandwidth), the use of optical cable access transmission. Therefore, in the implementation of "light into the copper back", combined with integrated access to the network planning to make access to the layer of optical cable planning and construction, the optical junction point and access to t

Network School: efficient Internet access starts from the correct connection

wire breaker instead, after all, no-blade wire breaker generally uses a hexagonal design, which can effectively prevent minor cables from being damaged when it is used for wire stripping. On the contrary, when using a blade wire breaker to create a network cable, the sharp blade will cut the skin of the cable accidentally, which brings a fault risk to the efficient communication of the network in the future. Optical module, reasonable connectionThe so-called optical terminal module is the conne

Various router interfaces and Connection Methods

Port The AuI port is the interface used to connect to the coarse coaxial cable. It is a "d" Type 15-pin interface, this is one of the most common ports in the ring or bus network. The router can connect to the 10base-5 network through a coarse coaxial cable transceiver. But more is the use of external transceiver (AUI-to-RJ-45), to achieve the connection with the 10base-t Ethernet. Of course, you can also

Network basic learning-nineteen vro hardware connection

used normally, the general router has a control port "console ", it is used to connect to a computer or terminal device and configure a router through specific software. Next, let's take a look at the router's LAN and WAN connection ports. 1. LAN interface According to the interface name, we can see that these interfaces are mainly used to connect routers and LAN, because the LAN type is also diverse, therefore, the LAN interface type of the router may be diverse. Different networks have di

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