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Thomas Farely

Tom has produced privateline.com since 1995. He is now a freelance technology writer who contributes regularly to the site.

His knowledge of telecommunications has served, most notably, the American Heritage Invention and Technology Magazine and The History Channel.
His interview on Alexander Graham Bell will air on the History Channel the end of 2006.

Ken Schmidt

Ken is a licensed attorney who has worked in the tower industry for seven years. He has managed the development of broadcast towers nationwide and developed and built cell towers.

He has been quoted in newspapers and magazines on issues regarding cell towers and has spoke at industry and non-industry conferences on cell tower related issues.

He is recognized as an expert on cell tower leases and due diligence processes for tower acquisitions.

« Network Subsystem | | Multiple access and channel structure »

January 17, 2006

Posted by Tom Farley & Mark van der Hoek at 09:50 AM

Radio link aspects

The International Telecommunication Union (ITU), which manages the international allocation of radio spectrum (among many other functions), allocated the bands 890-915 MHz for the uplink (mobile station to base station) and 935-960 MHz for the downlink (base station to mobile station) for mobile networks in Europe. Since this range was already being used in the early 1980s by the analog systems of the day, the CEPT had the foresight to reserve the top 10 MHz of each band for the GSM network that was still being developed. Eventually, GSM will be allocated the entire 2x25 MHz bandwidth.

Cellular Radio frequencies around the world

American Cellular  
AMPS, N-AMPS, D-AMPS (IS-136) CDMA
824-849 MHz
869-894 MHz
Mobile to base
Base to mobile
American PCS/GSM
 
Narrowband 901-941 MHz  
Broadband
1850-1910MHz
1930-1990 MHz
Mobile to base
Base to mobile
E-TACS    
 
872-905 MHz
917-950 MHz
Mobile to base
Base to mobile
GSM  
GSM has three main frequency bands around the world: 900 MHz, 1800 MHz, and 1900 MHz. It all depends on the country. Other bands may be used in the future or may be in trial right now.
935-960MHz
890-915MHz
 
1800MHz   
1900 MHz.  
   
JDC    
 
810-826 MHz
940-956 MHz
1429-1441 MHz
1477-1489 MHz
Mobile to base
Base to mobile
Base to mobile
Mobile to base

GSM frequency spacing is 200Khz, AMPS is 30 Khz

American PCS/GSM/ Cellular frequencies

(A more specific view)

Click on this link to view PCS/GSM frequencies in the U.S.

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