PG-1400 Service Manual
SECTION 1. Introduction
1.1 An Introduction of GSM Digital Cellular Mobile Communication System
GSM (Global System for Mobile communication) concluded that digital technology working in
the Time Division Multiple Access (TDMA) mode would provide the optimum solution for the
future system. Specifically , a TDMA system has the following advantage
►
Offers a possibility of channel splitting and advanced speech coding ,resulting in improved
spectrum efficiency.
►
Offers much greater variety of service than the analog
►
Allows considerable improvements to be made with regards to the protection of information.
The GSM system is basically designed as a combination of three major subsystem;
The network subsystem, the radio subsystem, and the operation support system.
The functional architecture of a GSM system can be divided into the Mobile Station (MS), the Base
Station (BS), and the Network Subsystem (NS). The MS is carried by the subscriber, the BS
subsystem controls the radio link with the MS and the NS performs the switching of calls between
the mobile and other fixed or mobile network users as well as mobility management. The MS and
the BS subsystem communicate across the Um interface also known as radio link
The specifications relating to MS are as follows:
z
TS 100 607-1 : Digital cellular telecommunication system()Mobile Station (MS)
Conformance specification Part1:Conformance specification
1.2 Frequency Allocation and Its Use
z
Transmit frequency band : 880 MHz ~ 915 MHz(For EGSM) , 1710 MHz ~ 1785 MHz(For DCS)
z
Receive frequency band: 925 MHz ~ 960 MHz(For EGSM) , 1805 MHz ~ 1880 MHz(For DCS)
z
Channel spacing : 200 KHz
z
ARFCN(Absolute Radio Frequency Channel Number) : 1~124 and 975~1023 (For EGSM),
512~885 (For DCS)
z
Transmit
·
receive frequency spacing: 45 MHz
z
Frequency band and Channel Arrangement
For standard GSM Fl(n)=890+0.2*n 1
≤
n
≤
124 Fu(n)=Fl(n)+45
890
MHz
~915
MHz
: Mobile Transmit,Base receive
935
MHz
~960
MHz
: Base Transmit, Mobile receive
For Extended GSM Fl(n)=890+0.2*n 1
≤
n
≤
124 Fu(n)=Fl(n)+45
Fl(n)=890+0.2*(n-1024) 975
≤
n
≤
1023
880
MHz
~915
MHz
: Mobile Transmit,Base receive
925
MHz
~960
MHz
: Base Transmit, Mobile receive
For DCS Band Fl(n)=1710.2+0.2*(n-512) 512
≤
n
≤
885 Fu(n)=Fl(n)+95
1710
MHz
~1785
MHz
: Mobile Transmit,Base receive
1805
MHz
~1880
MHz
: Base Transmit, Mobile receive
3
PANTECH
