Answer Posted / anjani kant
The gsm techlogy is divided in two parts.
1.BSS which consist
BTS
BSC
TRAU
2.NSS
MSC
HLR
VLR
EIR
AUC
one or more numer of MS( Mobile stations are connected from
one BSC and the interface between MS and BTS is air or Um
interface,one or more bts is connected from one bsc and the
interface is A-bis,one or more BSC and TRAU is connected by
one.The interface between MSC and BSC is called Air
interface and the interface between MSC and Trau is called
Ater interface.
MSc is connected from the HLR,VLR,EIR,Auc,GMSC,PSTN.
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