SS7 Network or SS7 Signaling system build by NSP (Network Service Part) and User Part. SS7 Used in OAM Networking system and alpha Numeric Messaging service. Here is a Network Structure for network Communication. Logically open system Interconnection (OSI) is not complete. Now, we are following a relationship between OSI and SS7 protocol Model.
First step of OSI layer known as physical layer connected with message transfer part level one of SS7 protocol
Data Link Layer connected with MTP level 2
Network Layer Connected with MTP Lower level 3. It is also known as NSP (Network Service Part)
Transport, Session and Presentation layer connected with Application service part (ASP)
The 7th Number layer of OSI Reference model Application connected with too many option of SS7 layer. Here Available operation, maintain and Admin Part (OMAP), Application service element (ASE), Transection Capabilities Application (TCAP). Not only is this but also there also available integrated service digital Network (ISDN) user part.
The signaling system work with some auto generated rules.
Each signal control and Instruction management by FIB (Forward Indicator Bid) with BIB (Backward Indicator Bid). Here also connected with FSN and BSN
Here used with Indicator for Check Indicator Bid.
Here present message signal and used S10 for help signaling Information. Signaling system has three are three points: SLS= Signaling Link Selection, DPC=Destination Point Code and OPC=Organization Point code.
Usage of SS7 by GMS: Permission for conversion, For return the results and For Reject four type component.
Performance objective of SS7: Availability and Dependability
Objective of MTP: Undetected error, Lost message, Message out of sequence and Transmission Rate error.
Objective of ISUP dependability : Probability of false operation, Probability of signaling, Delay and Cross of office signaling transfer time.
Function of Radio: The main work of communication receiver is using signal for communication, not for magazine .It is one of radio receiver that is experts in receiving high and low frequency. It is the home receiver and communication receiver is heterodyne receiver but there are too many different, change and feature.
As an Example: Double Super heterodyne receiver , Beat frequency oscillator , Tuning calibration , Noise limiter, Automatic frequency control, Squelch , Metering and Diversity reception.
Radio Receiver system work easily. There are two kinds of radio receiver: FM Radio Receiver and AM Radio Receiver. Both Receiver systems control with receiving Antenna.
At Presents, FM Receiver use better than AM Receiver. But Both Receiver has a basic block diagram.
Now, we shall describe about the radio communication receiver.
Firstly Radio receiving Antenna receive the signal from channel or media
Then the signal transmitted to RF Amplifier. The maximum transection of this media is up to 16 MHz
Then the signal forward to first mixer (1.7 MHz), 2 Stage amplifier and second mixer (1.7 MHz)
Then again transfer to two stage Amplifier (200 KHz)
There are three internal devices which improve the signal detector. AGC Amplifier, Beat Frequency oscillator. There is also a crystal oscillator available.
Detector Transmit the signal into local oscillator which frequency range up to 17.7 MHz
Then transfer the signal to squelch circuit.
Then transfer the signal to Audio Amplifier
Finally Finished the signal to Speaker