nature of recivable in corporate

May 29th, 2015
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Abilene Christian University
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Functions of BTS? 1.Preform TransRecive functions. 2.Encrypting & decrypting with BSC 3. TransRecivrs allow several frequencies and different sectors. 4.Interface with BSC by BSF (base station control function o&m) 5.Manages operation status of TX. Software handling and alarm collection. 6.Mdulate Layer 1 Um for GMSK or 8PSK

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GSM1. GSM working on three bands are 900MHz 1800MHz1900MHzPCS USA2. Uplink frequency 890 915 MHzDown frequency935 - 960 MHz3.Mulitiple access techniques used in GSM are FDMATDMA4. Data Frequency Used in GSM 25 MHz 5.Toatal Carriers Used in GSM125 Carriers6.Each Carrier Frequency in GSM200KHz7.Each Carrier data rate 270.8 Kbps9.Modulation used in GSM GMSK (Gaussian Mean Shift Key)10. Out of 125 carrier only one carrier called ARFCN and it is not used. Rest of the carriers are used .11. 124 Carriers are divided to 4 GSM operators 124/4 = 31 carriers per GSM operator.12.Bursting is the periodical switching.13. GSM using same set of frequency between 2 cell areas.14. Any mobile phone served by a cell area called mobile phone.15. Cell pattern is a Group of cells 16.Cell pattern used in GSM4 cell pattern7 cell

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