Answer / praveena

How a Call is made from PSTN to Mobile:

Joe to PSTN:
Hello, this is Joe. I want to talk to Lynn.
PSTN to MSC:
Hello, I have a call for Lynn.
MSC to all base stations:
Calling all base stations. Where is Lynn?
Base station #1: Base Station #2:
Base Station #3:
Is Lynn here? Is Lynn here?
Is Lynn here?
Lynn to station #1:
(loudly) HERE
My ESN is 1123445
My Station Mark is 100 mW
Lynn to station #2:
(softly) Here
My ESN is 1123445
My Station Mark is 100 mW
Base station #1 to MSC:
Lynn is HERE and she is THIS loud.
Her ESN is 1123445
Her Station Mark is 100 mW
Base station #2 to MSC:
Lynn is here and she is this loud.
Her ESN is 1123445
Her Station Mark is 10 mW
MSC (thinking):
Hmm… does Lynn’s ESN match my records.
Yes, it does! From her ESN, I can find her HLR (home
location register) and decide how much to bill her and if
she has any special calling plans or features.
I can bill her 70 cents per minute!
Which base station shall we use? #1 was louder than #2, I
can tell that from her station mark.
MSC to base station #1:
Base station #1, set up a voice channel for Lynn.
Base Station #1 (thinking):
Hmm.. we need a new voice channel for Lynn. Jeremy just
finished using 824 MHz. We will put her there…
Base Station #1 to Lynn:
Lynn, please set your frequency to 824 MHz.
(Lynn’s phone rings.)
Lynn to Base Station #1:
(Lynn picks up the phone) Ok, frequency set to 824
MHz. “Hello?”
Base station #1 to MSC:
Ok, Lynn is ready to receive voice. Here is her
message, “Hello?”
MSC to PSTN:
Ok, Lynn is ready to receive voice. Here is her
message, “Hello?”
PSTN to Joe:
“Hello?”
Joe to PSTN:
“Hello, Lynn, this is Joe.”
PSTN to MSC:
Message to Lynn: “Hello, Lynn, this is Joe.”
MSC to Base station #1:
Message to Lynn: “Hello, Lynn, this is Joe.”
Base station #1 to Lynn:
Message to Lynn: “Hello, Lynn, this is Joe.”

Answer / nitin sharma

"A" wants to make a call to "B" with in a city using "pstn"
which is "PUBLIC SWITCH TELEPHONE NETWORK" OR LANDLINE
PHONE TO A MOBILE PHONE?
STEP-1
Call will go to MSC, Main switching center or a telephone
exchange.
STEP-2
EXCHANGE WILL CHECK THE DIALED SUBSCRIBER NUMBER, BELONGS TO
WHICH SERVICE PROVIDER IN THE CITY.
STEP-3
AFTER SEARCH,MSC WILL FORWARD IT T0 MSC OF DIALED NETWORK
IN SAME CITY.
STEP-4
MSC WILL CHECK THE LOCATION OF HLR(HOME LOCATION REGISTER)
VLR(VISITOR LOCATION REGISTER)OR IN ROAMING/OUT OF TOWN
CALLS.
STEP-5
MSC FOUND THE "A" IS IN THE CITY. CALL WILL GO TO BSC(BASE
SWITCHING CENTER )
STEP-6
BSC FOUND "A" IS CURRENTLY IS "XYZ" AREA BSC WILL FORWARD
INFORMATION TO BTS (BASE TRANSRECIVER STATION) IT IS USED
TO TRANSFER AND RECIEVE DATA IN TERMS OF TEXT AND VOICE.
LAST STEP
BTS WILL CONNECT THE CALL TO MS(MOBILE STATION)YOUR MOBILE
HANDSET.PHONE OF "A" WILL START RINGING.

Answer / avinash

Praveena supb explanation yarrrrrrrrr

Answer / vijay

Praveena.. ur explanation is jus awesome.. thr is no more to
say after ur explanation.. one request is there.. pls send
me the soft copy of the book or material u have from which u
got the answer... I wud b very thankful to i u.. my mail id.
vijay.swami2003@gmail.com

Answer / syed

Praveena.. ur explanation is jus awesome.. thr is no more to
say after ur explanation.. one request is there.. pls send
me the soft copy of the book or material u have from which u
got the answer... I wud b very thankful to i u.. my mail id.
pssyedahamed@gmail.com

Answer / dhiraj

Praveena.. ur explanation is jus awesome.. thr is no more to
say after ur explanation.. one request is there.. pls send
me the soft copy of the book or material u have from which u
got the answer... I wud b very thankful to i u.. my mail id
IS dsamadder44@gmail.com

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