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Source: Communications Network Test and Measurement Handbook
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Introduction to Signaling In a telecommunications network, signaling is the means by which the user is provided with appropriate network services Call setup, delivery, teardown, and billing are all controlled by various signaling messages The first form of signaling, Channel Associated Signaling (CAS), was transmitted from point to point on the same circuit used for message transmission Thus the dialed digits traversed the telecommunications network, set up the voice paths from caller to called party step by step, and ceased when the called party answered No further signaling messages were possible until the call terminated and the various parts of the voice path were released for use in other calls The need to provide a better form of signaling was driven by several factors:
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CAS is inefficient in its use of voice circuits because they are required during both call setup and teardown They are required during setup even if the called party does not answer Every circuit requires signaling equipment Signaling messages cannot be transmitted during calls New services, such as those where the number dialed is not the actual number called, are difficult to implement with CAS
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Common Channel Signaling Common Channel Signaling (CCS) in effect uses a separate, high-speed data transmission network for all signaling messages All these messages are transported on a common signaling network, which controls the switched network to provide users with the services they require Figure 311 illustrates this concept, showing a
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Signaling System 7 (SS7) Testing 726 Network Test Instrumentation
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Broadband
Transmission Network
AIN POTS Video Data
800 Services
Figure 311 The transmission network providing services under the control of the SS7 network
separate signal network that sits above the transmission network, with the various connections required to control the transmission network resources This illustration is a conceptual one because the high-speed data links required by the signaling network are, of course, part of the transmission network itself Great care is taken in the allocation of common channel signaling circuits, however, to ensure that transmission network failures do not disrupt the signaling network In the late 1970s the first common channel signaling system, CCS System No 6, was formulated by the ITU-T (formerly CCITT) Despite initial worldwide enthusiasm, it was deployed widely only in North America This system lacked the flexibility required by the demand for new services and was replaced by a new standard, Signaling System No 7 (SS7), which has been adopted worldwide Although SS7 is an international standard, there are various flavors in use throughout the world While in North America ANSI and Bellcore set the standards, most of the rest of the world follows ITU-T recommendations Special versions have been set up to support cellular networks, which require added complexity in messages, as well as message sequences to handle cell change-over for roaming users Flexibility in the standards definitions allows individual telephone operators or network equipment providers to customize the protocol to the extent that most countries now use their own versions ITU-T standards are used at international gateways in most cases, however Both the North American and ITU-T standards have been continually developed since their inception as new features have been added and new types of service offered
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Signaling System 7 (SS7) Testing Signaling System 7 (SS7) Testing 727
A Typical North American SS7 Network The nodes in a signaling network generally are referred to as Signaling Points Figure 312 shows the different types of Signaling Points and links found in a typical North American SS7 network Each of the Signaling Points will be described in turn
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