Introduction Laser head:It moves from the center to the outside in the Table-of-Contents area, and finds the disc by emitting a laser At the designated position on the upper side, the inductive resi...
ISDN modem, a machine that provides modulated data and demodulated data for ISDN (Integrated Services Digital Network)ISDN modem converts digital signals into analog signals through modulation at the...
The source of the word The English of networm: nethead and "networm" mean the same thing, it means "net fanatic, netizen"; and netizen can be used to refer to all netizens, especially Internet users,...
Internally, they are connected to Fibre Channel or SCSI tape drives. Therefore, the interface controller can manage shared network access and provide most of the required reliability and security.
Introduction The Mini-DVI interface is used on Apple’s computers. It is a digital alternative to the Mini-VGA interface. Its size is between the normal DVI interface and the Micro-DVI interface. It...
Introduction Frame Check SequenceThe judgment process is as follows: the sending network card uses a polynomial calculation, called cyclic redundancy check (CRC), and writes the calculation result I...
A physical recording block on the hard disk needs three parameters to locate: cylinder number, sector number, head number. Hard disk capacity = number of cylinders × number of heads × number of sector...
The same algorithm for the ring redundancy code is checked.If there is an error, it needs to be retransmitted. 2. Examples of cyclic redundancy code generation and code word correctness verification....
V.90 is a 56Kbps data transmission standard formulated by the ITU (International Telecommunication Union). Through the use of compression schemes such as V.42bis, the modem can operate at a rate of 56...
Concept Synchronous control is in contrast to asynchronous control. The content of a synchronously controlled led display is the same as that of the display that controls the computer when publishin...
Development Overview With the popularity of computers in the home, more and more file exchanges have also occurred. How do you "move" the data in your computer at this time? It's very simple, just bu...
Non-electric signals (such as sound, light, etc.) are input to the converter (such as microphones, photoelectric tubes) to output continuous electrical signals, so that the frequency or amplitude of t...
Definition The transmission unit is a data block composed of multiple bytes or multiple bits. It is synchronized only at the beginning of the frame, and a fixed clock is maintained within the frame....
Collision detection classification Carrier Sense Multiple Access/Collision Detection (CSMA/CD)This solution requires the device to perform the channel detection while sending the frame. Listen to d...
Introduction XMODEM is a low-speed file transfer protocol. KERMIT is a file transfer protocol used in an asynchronous communication environment. The main difference between it and XMODEM is: KERMIT...