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GSM network interfaces-Um,A,Asub,Abis,B,C,D,E,F,G


This tutorial section on GSM basics covers following sub topics:
Main Page  Frame  Burst types  PHY  gsm stack  speech processing  ARFCN  Channel types  GSM Security  Network Entry  Mobile basics 


This page of GSM tutorial covers GSM network interfaces which includes Um, A, Asub, Abis, B, C, D, E, F and G interfaces.


GSM network interfaces


Figure-1 depicts all the GSM network interfaces between GSM subsystems. The table below describes the same GSM network interfaces.

GSM interface Description with position
Um It is the air interface used between MS and BTS.It carries the GSM bursts carrying data and control information. Also referred as Air interface.
A or Asub It is used between BSC and MSC/VLR. It supports 2Mbps standard digital connection as per CCITT.
Abis It is used between BTS and BSC. It supports two types of communication links viz. traffic channel at 64 kbps and signaling channel at 16 kbps.
B It is used between MSC and VLR.
C It is used between HLR and GMSC. Also between MSC and HLR.
D It is used between HLR and VLR.
E It is used between MSC and another MSC or G-MSC.
F It is used between EIR and MSC and between EIR and G-MSC.
G It is used between VLR and another VLR.

Refer GPRS Network Interfaces➤.

RELATED LINKS

GSM Tutorial   GSM RF planning  GSM mobile originated call flow   GSM Mobile Terminated Call flow  GSM protocol stack   GSM physical layer   GPRS protocol stack   GPRS tutorial  


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