What is signaling?
Signaling is a type of message passed between the terminal and the terminal, and the terminal and the network. It is specifically used to control circuits, establish, manage, and delete connections so that users can communicate through these connections normally.
What is the signaling method? What exactly does it include?
The signaling method refers to the rules and conventions to be followed in the signal transmission process. It includes: the structure of signaling, the transmission method of signaling on multi-segment routes, and the control method of signaling.
What are the types of signaling?
The signaling network can be divided into two types: user signaling and inter-office signaling according to its use.
User signaling acts between the user terminal equipment (such as a telephone) and the exchange of the telephone office, and the latter acts between two exchanges connected by trunk lines.
Inter-office signaling can be divided into channel signaling and common channel signaling. The associated signaling means that the signaling network is attached to the computer network or the telephone network, and there is no need to rebuild a network. For common channel signaling, a signaling network needs to be rebuilt (mainly between central offices).
What is a signaling network?
The signaling network is a dedicated data support network for transmitting signaling in the common channel signaling system.
What constitutes a signaling network?
The signaling network is generally composed of signaling points (SP), signaling transfer points (STP) and signaling links.
The signaling network can be divided into:
According to the structure, the signaling network can be divided into: stepless signaling network and hierarchical signaling network.
Stepless signaling network
No signaling transition point is introduced in the signaling network, and the direct connection working mode is adopted between the signaling points. This method cannot meet the requirements of international and domestic signaling networks in terms of capacity and economy, so it has not been widely adopted.
Hierarchical signaling network
The signaling network containing signaling transition points can be divided into second-level and third-level networks according to their levels. Most countries use secondary networks. When secondary networks cannot meet the requirements, tertiary networks should be used.
What are the major categories of performance indicators for signaling networks?
Signalling network availability indicators;
Dependability index of signaling network;
Signalling network delay index;
What are the coding methods of signaling points? What are the applications?
The signaling network international coding (CCITT) method is 14 bits, while the domestic point coding method uses 24 bits.
What is the three-level structure of the signaling network?
Three-level signaling network structure (HSTP, LSTP, SP), long-distance signaling network level 3, large and medium-sized urban local network level 2, SP includes telephone switching office, ISDN switching office, service switching point SSP, service control point SCP, etc. .
Multi-level signaling network
The use of several levels of signaling network mainly depends on the following two factors: the number of signaling points that the signaling network can accommodate and the capacity of STP.
The STP capacity can be expressed by two parameters: the maximum number of signaling chains that can be connected by STP, and the signaling processing capacity (the maximum number of message signaling units that can be processed per second MSU / s).
Among them, independent STP: the maximum number of signaling links is not less than 256 links, and the signaling processing capability is not less than 20,000 MSU / s. Comprehensive STP: The maximum number of signaling links is not less than 256 links, and the signaling processing capability is not less than 10000MSU / s.
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