how a call route from pstn to mobile.please tell in details
Answer Posted / 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.”
Is This Answer Correct ? | 21 Yes | 5 No |
Post New Answer View All Answers
What are the maintenances of a DCS ?
What is delay angle?
What is memristor? How many modes it works? What is its advantage?
Explain radio environment in building.
What is the effect of high frequency on its performance?
Explain in wave guides tem wave propagation is not exit, give the physical interpretation?
Explain what are the advantages of using a voltage follower amplifier?
I am completed BE electronics and communication engineer I have 4 years experience in mainteance dept .am applying for c license is possible...How 2 get c license
What are the advantages of current commuted chopper?
Define what is a high-pass filter?
i need recent placement paper
What is the use of excitation table in digital electronics?
The magnitude of electrostatic force between two identical positive ions that are separated by a distance of 5.0 x 10– 10 m is 3.7 x 10–9 N. (a) What is the charge of each ion? (b) How many electrons are “missing” from each ion?
Define pinch-off voltage
what is an industrial electronics engineer ? what he does ? what specialities and experties he should have ? what are the difference between industrial electronics engineer & electronics engineer & electrical engineer ?