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➤.
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