Overview of Interfaces in telecom network

There are many interfaces between each component in telecom network. Each interface has been given a specific name in telecom network. Telecom engineer should remember name of interfaces to work effectively. Below are most of the interfaces used in telecom network:

Interface between MSC and MSC is G CP (G control part) interface.

A mobile user enters into new MSC area then new MSC use this interface to get information from OLD MSC.

Interface between MSC and HLR is D interface.

This interface is used to get information regarding mobile user profile in network.  MSC also request mobile user location information to HLR using this interface.

Interface between MSC and FNR is also D interface.

This is used for sending message to other component in the network.

Interface between MSC and BSC is called A interface.

This interface is used for signaling purpose in the network. There are many important tasks happen on this interface like call establish, call handover and call release.

Interface between MSC and SCF is L interface.

This interface is used to transfer information to prepaid network in telecom. Prepaid network in telecom is called intelligent network (IN).

Interface between MSC and EIR is F interface.

This interface is used to check authenticity of mobile handset whether it is in white, grey and black listed.

Interface between MSC and RNC is called Lu interface.

This interface is used for signaling purpose in the network. There are many important tasks happen on this interface like call establish, call handover and call release.

Interface between MSC and SGSN is Gs interface.

This interface is used by SGSN for those subscribers who have subscribed to data services.

Interface between BSS and SGSN is Gb Interface.

This is used to exchange information between BSS and SGSN.

Interface between RAN and SGSN is Lu interface.

This interface is used to exchange information between RAN and SGSN.

Interface between SGSN and HLR is Gr interface.

This interface is used to get location and subscriber based information of mobile user from HLR.

Interface between SGSN and VLR is Gs interface.

This interface is used to update latest location of mobile user.

Interface between SGSN and SCP is Ge interface.
This interface is used to transfer information to prepaid network i.e. intelligent network so that charging of data services can be done.

Interface between SGSN and SMSC is Gd interface.

This interface is used when a mobile user want to send SMS using data services.

Interface between SGSN and GGSN is Gn interface.

This interface is used for communication of SGSN and GGSN. This interface also passes from packet backbone network.

Interface between GGSN, SGSN and OSS is Gom interface.

This interface is used for monitoring purpose.

Interface between GGSN and ISP network (Internet).

This interface is used to send/receive data packet from ISP.

Interface between home packet core network and other network GGSN node is Gp interface.

This interface Is used to data packet in roaming cases.

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