Welcome to my blog! If this is the first time, you are here then I request you to kindly read my Introduction post because I have certain things to say and they are all there:)

Also, if somewhere while going through any of the posts, you feel that something is wrong, plz feel free to comment then and there. I love to get corrected and so, plz do not think a bit before commenting on anything you think I have mentioned is wrong. The only request is plz maintain your dignity and mine as well in the words you use! Kindly do not let your words be a slur on others:) I would be grateful.

Also, I assure you that before writing anything here I will get the same checked with some experienced people, I will do a research again and then only, I will post the same on my blog so you can trust me.

Disclaimer: All the posts on this blog are based on my personal learning, opinion and views. It has no connection, no connotation with the organization I am or I was working for or with any person associated with me.

Happy learning...

GSM Core Network: Diagram

So in the last post we got to learn the systems and their entities that are involved and makes a GSM network. In this post, I have tried to put all the entites in a diagram to depict a clear picture of the connection between all the systems and all the entities.

BSC: Base Station Controller
MSC: Mobile Station Controller
SMSC:Short message Service Centre
EIR: Equipment Identity Register
HLR: Home Location Register
AUC: Authentication Centre
PSTN: Public Switched Telephone Network

From next post, we will start going through each of the systems and entities in details so be ready for a lot of technical gyaan:D

Keep Smiling....


  1. Hai Shivani Singh,

    Nice blog anyway. Thanks for your information.
    I have one question. I would like to ask where is the SGSN and GGSN position on your diagram?

    M Idham Habibie

  2. Hi Shavani,

    What is the software you used to draw this diagram represented above. Is it a proprietary software or a free software. I'm looking for a network diagram software to draw network diagrams.