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How do you convert cellphone gsm frequency to another gsm frequency?
How do you convert cellphone gsm frequency to another gsm frequency?"
What is uplink frequency in gsm?
GSM 900: Uplink frequency: 890 - 915 MHz GSM 1800 : Uplink frequency: 1710 - 1785 MHz GSM 1900: Uplink frequency: 1850 - 1910 MHz
What is the radio frequency range of inmarsat satellite?
System Specifications: 1. Tx Frequency; 1626.5-1646.5MHz 2. EIRPG33/25dBW 3. Rx Frequency; 1525.0-1545.0MHz 4. Channel Spacing; 20kHz
What is the minimum and maximum spacing for placing reinforcement bar?
maximum spacing assording to IS 456 = 300mm
How modulation rate is calculated for gsm?
The modulation rate in GSM (Global System for Mobile Communications) is primarily determined by the modulation scheme used, which is Gaussian Minimum Shift Keying (GMSK). In GSM, each symbol represents one bit of data, and the modulation rate is calculated based on the symbol rate, which is typically set at 270.833 ksym/s. Thus, the modulation rate is effectively equal to the symbol rate, as each symbol conveys one bit of information, leading to a maximum data rate of about 1.2 kbps per channel.
How do you find 125 channel in gsm?
GSM Band 890 to 915= 25 MHz One GSM Channel BW= 200 KHz Total GSM channels=25MHz/200KHz=125
What is channel spacing in gsm?
Channel spacing in GSM (Global System for Mobile Communications) refers to the frequency separation between adjacent radio channels used for communication. In GSM, the standard channel spacing is 200 kHz, which allows for efficient use of the available frequency spectrum while minimizing interference between channels. This spacing is crucial for maintaining the quality of voice and data transmission in mobile networks. Each channel can support a single voice call or data session, ensuring effective communication for users.
How many channels are present in GSM 900?
174 no ........ the uplink is 890-915 & down link is 935-960.....MHz each channel having band width of 200KHz & using by 8 subsciber.... so 25MHz/200Khz ......=125...so there are 125 channels present in GSM900 but one channel is use as a guard so only 124 channel present in GSM900
Why in gsm we are taking 200kHz as bandwidth why we cant take 100kHz or some thing less than 200kHz so that we can increase the ARFCNs.?
because we can use 99% of 270.5 kbps which is normally used for air interface in gsm, to get a minimum bit error rate of 1% and 8/1 db sn ratio.
What is the difference between WDM and DWDM?
WDM classification is based on channel spacing between two wavelengths * channel spacing greater than 200GHZ is called as CWDM * channel spacing greater than 100GHZ is called as WDM * channel spacing lesser than 100GHZ is called as DWDM * channel spacing lesser than 25GHZ is called as UDWDM 100GHZ = 0.8nm WDM classification is based on channel spacing between two wavelengths * channel spacing greater than 200GHZ is called as CWDM * channel spacing greater than 100GHZ is called as WDM * channel spacing lesser than 100GHZ is called as DWDM * channel spacing lesser than 25GHZ is called as UDWDM 100GHZ = 0.8nm
Why in gsm we are taking 200kHz as bandwidth why we cant take 100kHz or some thing less than 200kHz so that we can increase the ARFCNs?
In GSM, a bandwidth of 200 kHz is chosen to balance the needs for voice quality, capacity, and interference management. While a smaller bandwidth like 100 kHz could technically increase the number of available ARFCNs (Absolute Radio Frequency Channel Numbers), it would compromise voice quality and increase the likelihood of interference between channels. The 200 kHz allocation allows for sufficient guard bands and accommodates the modulation techniques used, ensuring effective communication and maintaining service reliability.
What is a channel spacing?
Channel spacing is the difference in the frequency allocation of the allocated frequency plan to avoid overlap between the channels or frequencies.
Gsm 900 vs gsm 1800?
GSM-900 and GSM-1800 are used in most parts of the world: Europe, Middle East, Africa, Australia and most of Asia. In South and Central America the following countries use the following: : :* Costa Rica - GSM-1800 :* Brazil - GSM-850, 900 and 1800 :* Guatemala - GSM-850, GSM-900 and 1900 :* El Salvador - GSM-850, GSM-900 and 1900 GSM-900 uses 890-915 MHz to send information from the mobile station to the base station (uplink) and 935-960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. Guard bands 100 kHz wide are placed at either end of the range of frequencies[1]. : In some countries the GSM-900 band has been extended to cover a larger frequency range. This 'extended GSM', E-GSM, uses 880-915 MHz (uplink) and 925-960 MHz (downlink), adding 50 channels (channel numbers 975 to 1023 and 0) to the original GSM-900 band. The GSM specifications also describe 'railways GSM', GSM-R, which uses 876-915 MHz (uplink) and 921-960 MHz (downlink). Channel numbers 955 to 1023. GSM-R provides additional channels and specialized services for use by railway personnel. : All these variants are included in the GSM-900 specification. GSM-1800 uses 1710-1785 MHz to send information from the mobile station to the base tranceiver station (uplink) and 1805-1880 MHz for the other direction (downlink), providing 374 channels (channel numbers 512 to 885). Duplex spacing is 95 MHz. : GSM-1800 is also called DCS (Digital Cellular Service) in the United Kingdom, while being called PCS in Hong Kong[2] (not to mix up with GSM-1900 which is commonly called PCS in the rest of the world.)
What is the full bit rate per voice channel in GSM?
270.83 kbps
What is Packet Data Channel?
Any time-slot on any GSM radio channel assigned to GPRS usage is defined as a Packet. Data CHannel(PDCH).
What is 200kHz in the electromagnetic spectrum used for?
-- aeronautical mobile -- aeronautical radionavigation
What are lapd and lapdm gsm?
link acess protocol for the D channel is used in the radio link between bts and ms
