What's the meaning of power PHS

1. PHS (personal handy phone system, market name sometimes personal access system, personal phone access system) is a kind of wireless local telephone technology, which adopts micro cellular communication technology. PHS operates in the 1880-1930 MHz band< In fact, PHS technology belongs to the second generation of communication technology. The coverage of PHS base station is limited, and the distance between communication base station and terminal is short. Therefore, the communication power is small, and more base stations are needed to cover a larger area. This makes PHS more suitable for use in urban areas, but less effective in the field. In terms of the communication speed of mobile phones, PHS belongs to 2G. It's also designed to delay calls a little PHS uses TDMA / TDD as its radio communication interface and 32K ADPCM as its voice transmission code. Modern PHS phone can also support some other ISP value-added services, such as Internet narrowband communication, SMS, e-mail, and even picture messaging

PHS technology is also suitable for small-scale radio communication<

using
the initial release was in NTT laboratory in Japan in 1989, which appeared as a form of technology competing with GSM and PDC. In the early stage, it was developed by Japan according to its national conditions (the characteristics of large population density and small population mobility in most places). In 1995, it was initially operated by three telecom operators in Japan: NTT personal, DDI pocket and Astel. However, shortly after the launch of the service, the technology was called "poor people's cell" and was greatly restricted in Japan. Market share is also graally declining. Some countries that used to use PHS technology also began to use GSM, such as Chile. However, PHS technology is popular in some countries and regions with low fees and less additional business, such as Chinese mainland, Taiwan, Vietnam, Bangladesh, Nigeria, Mali, Tanzania and Honras. Br />
PHS's market
China Chinese mainland, China Telecom and China Netcom's PHS business use PHS technology in most places. In Taiwan, PHS technology is also used in low-power mobile phones of Volkswagen Telecom
References: http://ke..com/lemma-php/dispose/view.php/87833.htm

2. PHS (personal handy phone system), which is commonly referred to as PHS, refers to a kind of wireless local telephone technology, using micro cellular communication technology. PHS technology is actually digital mobile communication technology, belonging to the second generation of communication technology. The coverage of PHS base station is limited, and the distance between communication base station and terminal is short. Therefore, the communication power is small, and more base stations are needed to cover a larger area. In terms of the communication speed of mobile phones, PHS belongs to 2G.

3. What is PHS

PHS is a network system developed in Japan, which is called "personal handset system" in Japan. It was put into operation in July 1995. At present, there are three PHS operators in Japan: NTT, Astel and DDI. DDI, a subsidiary of Kyocera, owns 60% of the PHS market and 75% of the traffic in Japan. It's said that it's very cheap to buy PHS mobile phone in Japan. Japan's PHS mobile phone is almost all Japanese, almost no way to read English, let alone Chinese! In Japan, PHS has three different system operators, including NTT, DDI and Astel. Each of them adopts different systems and code burners, and each of them uses different spectrum. No matter which one you buy, you can't use it in China< PHS Network - (1900 MHz)

domestic PHS network is composed of three kinds of networks: UTStarcom, Lucent and ZTX. The parameters that users need to know are ps-id, i.e. phone proction number, CCH, operator ID, psnum BER, country code and authentication key (i.e. password of mobile phone use right, rewritekey and read key) When the mobile phone writes the number again, it needs to rewrite the password when deleting the number, and it needs to read the password when the mobile phone wants to read the code

3. Wiwi (wireless internet access)

[Wiwi] must be through the PHS mobile phone and the dedicated wireless Internet Suite. When buying a mobile phone, you don't need to apply for [Wiwi], because every PHS can use this service. Because [Wiwi] uses ISDN digital circuit, it does not pass the compression technology of ordinary home telephone modem, so as long as you connect to the website fast enough[ Wiwi] the actual transmission speed is the highest, which can exceed 60K. When the number of cell phone signal is small, the connection may be interrupted e to weak signal, but as long as your mobile phone can connect normally, the connection speed will not slow down<

4. PHS fax

PAS data line + PHS (708sy +) + ordinary fax machine = mobile wireless fax

as a modem, the fax machine molates the digital image signal into audio and transmits it through the local telephone communication network. Using PHS network as the carrier of wireless fax, sending and receiving wireless fax is as simple as using ordinary fax machine. Almost PHS system with a headset socket PHS with fax line, can achieve wireless fax function

5. The difference between PAS and PHS

PAS system is the extension and supplement of the existing fixed telephone network, without independent exchange and transmission resources. It belongs to the category of access party. In China, it is operated by fixed line operators. Japan's PHS system needs independent exchange, transmission, billing, operation and maintenance system, which belongs to the category of mobile communication network. PHS operators need to pay line rental fees to fixed line telephone operators. The system structure, operation mode, operator and main body of the two are quite different. The standard V5 interface is introced into PHS wireless access technology, which makes full use of the fixed telephone network resources, greatly reces the system cost, and makes it suitable for China's national conditions. This is the key reason for the success of PAS system in China. PAS system is characterized by large capacity, short construction period and high utilization of frequency resources. At present, PAS system can provide up to 64Kbps Internet data service, which is the fastest in commercial wireless data communication system. PAS, GSM and CDMA belong to the second generation wireless communication technology. PAS belongs to wireless access technology, GSM and CDMA belong to mobile communication technology.

4. Is this a ct fan

5. GSM refers to the second generation of communication technology. The full name of GSM is global system for mobile communications. In Chinese, it is global mobile communication system, commonly known as & quot; Global communication;, Is a mobile communication technology standard originated in Europe, is the second generation of mobile communication technology, its development purpose is to let all parts of the world can use a mobile phone network standard, so that users can use a mobile phone all over the world. This technical standard was introced into China in the early 1990s. Before that, cellular analog mobile technology, namely the first generation GSM technology, was adopted (China closed the analog mobile network on December 31, 2001). At present, China Mobile and China Unicom each have a GSM network, which is the largest mobile communication network in the world. GSM system includes GSM 900:900mhz, GSM 1800:1800mhz and gsm-1900:1900mhz.

6. What does motorcycle engine mean? 1 traffic light, 1263 minutes by bus, Metro Line 3, 7 toll sections,.

7.

250 refers to the diameter of the inner circular hole of the square pile after centrifugation, which is 250mm

Other characters meaning: PHS is the code of the national standard high strength prestressed concrete centrifugal square pile, AB is the pile type, 450 is the outer length of the square pile 450mm, 250 is the inner circular hole diameter 250mm, 9.8 is the double section pile with the pile length of 9m and 8m

hollow square pile is mainly composed of square pile body, end plate and steel hoop, which is more accepted by the market than pipe pile

{rrrrrrr}

extended data

compared with other pile types, especially prestressed concrete pipe pile, the outstanding advantages of hollow square pile are as follows:

1, large surface area and square or multilateral angle type, and the repose angle between pile and soil in soil layer is much larger than that of circular pile, This means that the hollow square pile can obtain greater bearing capacity than the pipe pile under the same geological conditions, saving a lot of basic funds for the project

According to the comparison, the bearing capacity of 350 hollow square pile is equivalent to that of 500 outer diameter thick wall pipe pile, and the cost of bearing capacity per kn is lower than that of prestressed concrete pipe pile, which means that designers can optimize square pile under the same design bearing capacity, and the market price of 350 hollow square pile is less than that of 500 outer diameter thick wall pipe pile, which can save a lot of material cost

According to the actual test of the Ministry of construction of Japan, the shear resistance of the square pile is 4.5 times of that of the pipe pile, which shows that the seismic performance of the hollow square pile is very superior, and it is worth popularizing in earthquake prone areas, high-rise buildings and large basement building foundations

reference materials

Network -- hollow square pile

Network -- prestressed concrete hollow square pile

8. P is the hook, h is the strike, s is the glide.

9. DCS is the abbreviation of distributed control system, which is also called distributed control system in domestic automatic control instry. It is a new type of computer control system relative to the centralized control system. It is developed and evolved on the basis of the centralized control system
PHS (personal handy phone system) is the supplement and extension of fixed network, also known as wireless local telephone, commonly known as "PHS".