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