Data transmission speed

The dielectric and the conductors are selected to maximize data transmission speed while miiumizing signal loss. In addition, dissipating heat generated by the microcircuits is rapidly becoming an important consideration. If too much heat builds up in the microelectronic device. 

Category 2 Supports data transmission speeds up to 4 megabytes per second 1.00... 

Almost every computer made since the original IBM PC has at least one serial port. They are easily identified because they have either a DB-9 male (shown in Figure 2.24) or DB-25 male port. Standard serial ports have a maximum data transmission speed of 57KBps and a maximum cable length of 50 feet. 

Fiber optic cables are especially suited for high speed data transmission. The new FDDI ( Fiber Distributed Data Interconnect ) standard specifies a transmission rate of 100 Mbits/s. The comparison between the Ethernet and FDDI standards are given in Table 9.3. 

The serial data transmission mode finds its greatest use in multiple detector/converter systems where data must be sent over moderate to long distances to the computer. The system is easy to implement, has a good noise immunity, and is reliable. The main disadvantage to the serial system is its moderate speed of transmission, which is about 3000 bytes/sec. This relatively low speed of transfer may limit its use in some very high-speed applications e.g. data acquisition of mass... 

Circuit Switched Data (CSD) transmission, which is the switched transmission of digital data with speeds up to 9.6 kbps via traffic channel an option of the CSD mode is a High Speed Circuit Switched Data (HSCSD) with speeds up to 57.6 kbps ... 

General Packet Radio Service (GPRS), a packet data transmission mode, with the speed up to 42.8 kb/s (uplink) and 85.6 kb/s (downlink) ... 

Beside a maximal transmission speed in GSM a rate of transmitted samples (contained measurement results) is very important as well. In our experiment packets (each file containts one 2-byte sample) were transmitted with an effective speed of 2640 b/s using GPRD or HSCSD technology. However, if we transmitted packets consist 1000 samples each the effective speed was 10 times higher, up to 26 kb/s This data mean that single samples from measurement were transmitted in a live mode with a rate of 55 S/s (samples per second) but packets with 1000 samples were transmitted with a rate of 1600 S/s. (Mackowski, 2008). 

Transmission of information between switchboards and to other locations such as a control room can be achieved by either optical fibre or hard wire cables. Suitable interfaces are placed at each end of the cables. As with many aspects of computing the speed of data transmission, method of porting, the protocols available, memory capacity and speed of calculation are upgraded, improved and superseded almost on a yearly basis. It is therefore necessary to be well aware of the state of the art in these subjects so that a system that is about to be superseded is not pmchased. 

The term bandwidth refers to the amount of bytes that can be transmitted over a communication channel per unit of time. For a given data set, a high bandwidth channel implies fast transmission speed. Distance is an enemy of bandwidth. Within a building, high speed networks can be provided at reasonable costs. For long distance communication,however, technology costs rise sharply and there are more contenders for the available bandwidth. 

Macro Chip Company s new generation of high speed and low power SCM STC12C5412AD is chose as the master control chips of wireless substations and wireless relay stations. The SCM use a single clock/machine cycle (It), 12 times faster than normal 8051 SCM Integrated 8 channels and 10 bit ADC ports, and save the AD conversion module for the system with a high speed SPI port that can satisfy the wireless communication with high speed data transmission. 

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