Ethereum account receiving interface
each version of Ethernet has a maximum cable length limit (that is, the length without amplification). Signals within this range can propagate normally, and signals beyond this range cannot propagate
in order to allow the construction of a larger network, repeaters can be used to connect multiple cables. Repeater is a physical layer device, which can receive, amplify and retransmit signals in two directions
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several common Ethernet interface types
1. SC optical fiber interface
SC optical fiber interface has been applied in the era of 100base TX Ethernet, so it was called 100base FX at that time (F is the abbreviation of optical fiber). However, at that time, because the performance was not more prominent than twisted pair, but the cost was higher, so it was not popularized. Now the instry vigorously promotes gigabit network, and SC optical fiber interface is re valued
2. RJ-45 interface
this kind of interface is the most common network equipment interface, commonly known as "crystal head", and the professional term is RJ-45 connector, which belongs to the type of twisted pair Ethernet interface. RJ-45 plug can only be inserted along the fixed direction, and a plastic spring piece is set to be stuck with RJ-45 slot to prevent it from falling off
3. FDDI interface
FDDI has the highest transmission rate among the mature LAN technologies. It has the characteristics of timed token protocol, supports a variety of topologies, and its transmission medium is optical fiber. Fiber distributed data interface (FDDI) is a set of protocols developed by American National Organization for Standardization (ANSI) to transmit digital signals on optical cables
reference source: Network Ethernet interface
If you want to query the transaction records on the main network, you can use Etherscan. However, if you build your own private chain, how should you query the transaction records
the answer is that you need to listen to the logs on the chain, save them in the database, and then query them in the database. For example:
< pre t = "code" L = "Java" > varaddr = & quot& quot;< br />varfilter=web3.eth.filter({fromB lock:0 ,toBlock:' latest', address:addr });< br />filter.get(function(err,transactions){transactions.forEach(function(tx){
vartxInfo=web3.eth.getTransaction(tx.transactionHash);
/ / at this time, the transaction information txinfo can be stored in the database
})< br />});
Web3. Eth. Filter() is used to monitor the log on the chain, and Web3. Eth. Gettransaction() is used to extract the information of the specified transaction. Once the transaction information is obtained, it can be stored in the database for query
recommend a practical introction, you can see: Ethereum tutorial
1. First, we click Start - control panel
The con port is the console interface, which is directly connected to the serial port of the computer by using the console cable. The router is configured locally by using the terminal emulator (generally using the "super terminal" of windows)
eth port is Ethernet interface, and Ethernet interface is the port of network data connection, which connects different computer devices together. The basic elements of Ethernet equipment networking include switch, router, hub, optical fiber and common network cable, Ethernet protocol and communication rules
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switches that can be used for network management generally have a "console" port, which is specially used for the configuration and management of switches. Connecting and configuring the switch through the console port is a necessary step to configure and manage the switch
because other configuration methods often need the help of IP address, domain name or device name, and it is obviously impossible for newly purchased switches to have these parameters built-in, so the console port is the most common and basic switch management and configuration port
console ports of different types of switches are located in different positions, some on the front panel and some on the back panel. Generally, molar switches are mostly located on the front panel, while fixed configuration switches are mostly located on the back panel. On the top or side of the port, there will be a sign similar to "console"
Ethernet interface types: SC optical fiber interface, RJ-45 interface, FDDI interface, AUI interface, BNC interface, console interface