OVERVIEW OF CCS7 SIGNALLING
OVERVIEW OF CCS7 SIGNALLING
Abstract
The CCS 7 is a Common Channel signalling system. That is, instead of signalling being associated with each traffic channel, a common signalling channel is used for all circuits. This signalling in telecommunication network establishes and realizes temporary connections, in accordance with the instructions and information received from subscriber lines and inter- exchange trunks, in the form of various signals. Therefore, it is necessary to interchange information between subscriber lines and between different exchanges. Though these signals may differ widely in their implementation they are collectively known as telephone signals. In this paper we discuss about CCS7 system architecture, protocol stack, link congestion and performance.
Keywords: IN (Intelligent Network),MTP (Message Transfer Point), SCCP(Signalling Connection Control Part), TCAP (Transaction Capabilities Application Part)
1. Introduction:
Common Channel Signalling (CCS) was designed in 1950s for analogue telecommunication and later adapted for digital exchanges.
Signalling is a co-coordinator of the telecommunication world. Why? Because any basic movement or function, such as; call set-up, call tearing down, dialled digits, routing information, voice mail calls, providing dial tone, call waiting tone, network management, network control, network maintenance, etc. All have to be transfer to exchanges with a function of messages. This system is known as Signalling System 7 (ss7 or c7). SS7 relies on Common Channel Signalling (CCS), a signalling method.
As telecommunication systems increased in complexity such as Intelligent Network (IN), GPRs, in near future UMTS or any other third party services. The new services required more complex functions such as, bi-directional signalling capabilities, and flexible call set-up and third party series database access.
2. CCS 7 System Architecture The CCS 7 is a Common
Abstract
The CCS 7 is a Common Channel signalling system. That is, instead of signalling being associated with each traffic channel, a common signalling channel is used for all circuits. This signalling in telecommunication network establishes and realizes temporary connections, in accordance with the instructions and information received from subscriber lines and inter- exchange trunks, in the form of various signals. Therefore, it is necessary to interchange information between subscriber lines and between different exchanges. Though these signals may differ widely in their implementation they are collectively known as telephone signals. In this paper we discuss about CCS7 system architecture, protocol stack, link congestion and performance.
Keywords: IN (Intelligent Network),MTP (Message Transfer Point), SCCP(Signalling Connection Control Part), TCAP (Transaction Capabilities Application Part)
1. Introduction:
Common Channel Signalling (CCS) was designed in 1950s for analogue telecommunication and later adapted for digital exchanges.
Signalling is a co-coordinator of the telecommunication world. Why? Because any basic movement or function, such as; call set-up, call tearing down, dialled digits, routing information, voice mail calls, providing dial tone, call waiting tone, network management, network control, network maintenance, etc. All have to be transfer to exchanges with a function of messages. This system is known as Signalling System 7 (ss7 or c7). SS7 relies on Common Channel Signalling (CCS), a signalling method.
As telecommunication systems increased in complexity such as Intelligent Network (IN), GPRs, in near future UMTS or any other third party services. The new services required more complex functions such as, bi-directional signalling capabilities, and flexible call set-up and third party series database access.
2. CCS 7 System Architecture The CCS 7 is a Common
References: [1].Modarressi, Skoog:”SS7: a tutorial”, IEEE Comm.Magazine, July 1990 [2].Laitinen, Rantala: ”Integration of IN services into GSM”, IEEE Comm.Magazine, June 1995 [3]Jabbari:”CCSS7 for ISDN and IN”, Proc. IEEE, Feb. 1991 [4].Bhatnagar: Engineering networks for synchronization, CCS7, and ISDN,IEEE Press, 1997 [5].Van Bosse: Signaling in telecommunication networks, Wiley, 1998