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Topic: SS7

Related Topics

Signalling System 7

Intelligent network

ISDN User Part

VoIP

Telephone operator

Automatic telephone exchange

OSI model

Layer 2

ISDN

Loop line

Integrated Services Digital Network

Base Station Controller

Blue box

Telephone exchange

Ringback

	SS7 Tutorial by Performance Technologies
		The ITU definition of SS7 allows for national variants such as the American National Standards Institute (ANSI) and Bell Communications Research (Telcordia Technologies) standards used in North America and the European Telecommunications Standards Institute (ETSI) standard used in Europe.
		SS7 messages are exchanged between network elements over 56 or 64 kilobit per second (kbps) bidirectional channels called signaling links.
		Because the SS7 network is critical to call processing, SCPs and STPs are usually deployed in mated pair configurations in separate physical locations to ensure network-wide service in the event of an isolated failure.
	www.pt.com /tutorials/ss7 (932 words)

	SS7 Planning and Engineering
		In addition, SS7 network nodes and links are deployed in a geographically diverse manner for survivability in the event of a disaster or equipment/facility isolation event.
		Traffic engineering of SS7 networks involves defining calls/data use cases, defining SS7 message attributes, gathering data and/or estimating demand, computing capacity requirements, determining the amount of calls/sessions that may be handled based on capacity demands and assumptions, monitoring growth of traffic demands, and planning for capacity exhaust.
		SS7 network nodes and links are engineered to allow for adequate capacity so that a failure in any one component will not prevent the remaining components from handling the entire remaining load.
	www.mobilein.com /ss7_planning_and_engineering.htm (571 words)

	Tekelec -- 1998 Annual Report - SS7 Timeline
		For the first time, telephone service providers can perform call setup functions (such as determining whether the party being called is on- or off-hook, and when to generate the ring tone and start the clock for billing) using a dedicated signaling path.
		SS7 networks widely implement query-and-response capability, in which telephone networks' Central Office access information from a database before proceeding with normal call setup function.
		In response to carriers' heightened appreciation of the value of their SS7 networks, Tekelec announces the MGTS Sentinel, enabling service providers to monitor and provide surveillance across their entire SS7 network from a centralized location.
	www.tekelec.com /annual98/ss7timeline.asp (733 words)

	Intel Public Network Signalling Tutorial (Site not responding. Last check: 2007-10-10)
		SS7 is defined as a number of independent blocks of functionality, each implementing a specific function and having a defined interface.
		In North America, SS7 may be carried on either a V.35 synchronous serial interface running at 56 or 64kbps, or multiplexed on to a 1.544Mbps T1 timeslot The SS7 messages are constructed similar to HDLC frames (each message being delimited by ‘flag’ bytes or octets, and containing a Cyclic Redundancy Check, CRC).
		Before an SS7 link is able to convey information from the higher layers, the layer 2 entities at each end of the link follow a handshaking procedure known as the proving period, lasting for 0.5 to 8.2 seconds (depending on the availability of routes served by the link in question).
	resource.intel.com /telecom/support/ss7/ss7tutorial/tutorial.html (5114 words)

	Signaling System 7 - Wikipedia, the free encyclopedia
		SS7 was designed to replace Signalling System #5 (SS5) and Signalling System #6 (SS6) and R2, all of which are ITU standards defined by ITU-T prior to SS7 and were once in widespread international use.
		SS7 has substantially replaced SS6, SS5, and R2, with the exception that R2 variants are still used in numerous nations.
		SS7 moved to a system in which the signaling information was out-of-band, carried in a separate signaling channel.
	en.wikipedia.org /wiki/SS7 (1350 words)

	SS7
		SS7 is a communications protocol that provides signaling and control for various network services and capabilities.
		SS7 is comprised of a series of interconnected network elements such as switches, databases, and routing nodes.
		SS7 is also the medium for advanced capabilities and applications including mobile networking and services as well as wireline applications such as toll-free calling and automatic calling card identification.
	www.mobilein.com /ss7.htm (648 words)

	SS7 Overview, Tutorials/Resources
		SS7 or Signaling System Number 7 is simply another set of protocols that describe a means of communication between telephone switches in public telephone networks.
		SS#7 is the defined interoffice signalling protocol for ISDN.
		The primary function of SS#7 is to provide call control, remote network management, and maintenance capabilities for the inter- office telephone network.
	www.telecomspace.com /ss7.html (440 words)

	What is Signaling System 7? - a definition from Whatis.com - see also: SS7
		SS7 uses what is called out-of-band signaling, meaning that signaling (control) information travels on a separate, dedicated 56 or 64 Kbps channel rather than within the same channel as the telephone call.
		Historically, the signaling for a telephone call has used the same voice circuit that the telephone call traveled on (this is known as in-band signaling).
		SS7 consists of a set of reserved or dedicated channel known as signaling links and the network points that they interconnect.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214365,00.html (498 words)

	What is SS7?
		SS7 signaling is done out-of-band, meaning that SS7 signaling messages are transported over a separate data connection.
		SS7 has numerous applications and is at the very heart of telecommunications.
		SS7 is the standard communication system that is used to control public telephone networks.
	www.tech-faq.com /ss7.shtml (733 words)

	SS7 Networks
		Common Channel Signaling System No. 7 (SS7) is a global ITU standard that defines the procedures and protocols by which network elements exchange call information in the Public Switched Telephone Network (PSTN).
		The SS7 network is an out-of-band digital overlay network using 56/64 Kbps DS0 channels for message units.
		The SS7 circuits are used to direct calls via outbound trunks and carry information pertaining to call set up and routing.
	www.sycamorenet.com /solutions/access/ss7_networks.asp (580 words)

	Continuous Computing \| Products \| Trillium \| SS7 / SIGTRAN
		SS7 is a suite of global telecommunications protocol standards that define the procedures by which network elements within the Public Switched Telephone Network (PSTN) exchange control information over digital signaling links for setting up, managing, and tearing down wireline and wireless calls.
		SS7 is also the protocol that defines the procedures to transport and process database queries necessary for providing today's advanced intelligent network (AIN) features and services.
		SS7 is increasingly being used to bridge the PSTN with next-generation Internet Protocol (IP) and 3G Wireless networks.
	www.ccpu.com /products/trillium/ss7sigtran.html (1212 words)

	ICMI - SS7 and VoIP (Site not responding. Last check: 2007-10-10)
		SS7 or C7 defines the protocol that is used by the public switched telephone network (PSTN) to exchange call information via a digital out-of-band network connection.
		SS7 is not just supported in the North American phone network but has broad support overseas, too.
		The SS7 protocol and call procedures support the existence of alternate number routing which may be used if the primary dialed number is busy or if the call goes unanswered.
	www.callcentermagazine.com /article/CTM20000607S0009 (1001 words)

	SS7
		The SS7 and its B-D derivatives are most notable for their Bo-Bo-Bo or "Tri-Bo" wheel arrangement.
		The SS7 is used for both pax and freight and seems to have been comparatively successful.
		The appearance is quite distinctive with the red and cream colour scheme and of course the tri-bogie arrangement.
	www.railwaysofchina.com /ss7.htm (175 words)

	Verizon Partner Solutions \| SS7 Interconnection and Transport (Site not responding. Last check: 2007-10-10)
		SS7 network technology is evolving into many new areas such as high speed signaling links and broadband network interworking.
		In this rapidly changing environment, it is critical that carriers interconnect their SS7 networks in such a way to maintain network reliability, service integrity and network security.
		SS7 Transport between Signaling Transfer Points (STP) is available in the Verizon West Area and SS7 Gateways are available in the Verizon East Area.
	www22.verizon.com /wholesale/solutions/solution/SS7.html (620 words)

	What is SS7? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-10-10)
		SS7 is characterized by high-speed circuit switching and out-of-band signaling using Service Switching (SSPs), Signal Transfer Points (STPs), and Service Control Points (SCPs) (collectively referred to as signaling points, or SS7 nodes).
		Out-of-band signaling is signaling that does not take place over the same path as the data transfer (or conversation)--a separate digital channel is created (called a signaling link), where messages are exchanged between network elements at 56 or 64 kilobit per second.
		SS7 architecture is set up in a way so that any node could exchange signaling with any other SS7-capable node, not just signaling between switches that are directly connected.
	www.webopedia.com /TERM/S/SS7.html (383 words)

	Spider SS7 STREAMS-Based Source-Code Implementation of the ITU SS7 Protocol Stack: Protocol Software: Products: Artesyn ... (Site not responding. Last check: 2007-10-10)
		Spider SS7 may also be used in conjunction with Spider's Distributed STREAMS Function (DSF) to split the layers over multiple devices.
		SS7 was originally established to define the procedures for the set-up, on-going management and clearing of a call between two users of the Public Switched Telephony Network (PSTN).
		The SS7 SSP is part of this CO. When a subscriber makes a call, the SSP uses a protocol called ISUP to send messages to the called party's SSP in order to set up a voice circuit (or 'trunk') between the two.
	www.artesyncp.com /products/Spider-SS7.html (1657 words)

	Telcordia - SS7 Signaling Analysis - Testing and Analysis for an NGN Solution
		The objective of the SS7 Conformance Testing and Analysis program is to provide comprehensive testing and analysis of the SS7 implementation for conformance to a relevant set of SS7 criteria (e.g., ANSI specifications, Telcordia generic requirements, or ITU-T recommendations).
		The objective of the SS7 Network Interoperability Testing and Analysis program is to determine the behavior and overall network impact of deploying the NGN Solution into a real (multi-supplier) node environment.
		The functional areas analyzed include: basic SS7 protocol tests to observe the responses and interactions of the NGN Solution with off-net (PSTN) network elements, simulated stress events to emulate both intra- and inter-network trouble conditions (e.g., persistent congestion), abnormal conditions (e.g., link failures and oscillations), and maintenance/management scenarios (e.g., circuit blocking).
	www.telcordia.com /services/testing/ss7/services_ngn.html (535 words)

	Empirix - SS7 and TDM
		SS7 is an out-of-band signaling solution that provides fast call setup for services and transaction capabilities which deal with remote data base interaction, such as for 800 number dialing.
		The relationship between SS7 and IP technology is continuing to evolve with protocols such as SIP-T (designed to encapsulate or translate PSTN signaling over SIP) and SIGTRAN (designed to transport PSTN messages over IP-based stacks that emulate the TDM transport mechanisms).
		SS7 and TDM are key parts of today’s networks that require rigorous testing to verify proper functionality, verify SS7 variants and validate inter-working with IP protocols.
	www.empirix.com /solutions/technology/SS7_TDM.asp (292 words)

	SS7 / C7: Signaling System # 7 for Telephony Signalling
		Signaling System #7 (SS7) is a telecommunications protocol suite defined by the ITU-T which is used by the telephone companies for interoffice signalling SS7 uses out of band or common-channel signalling (CCS) techniques, which uses a separated packet-switched network for the signalling purpose.
		SS7 is known as C7 outside North America.
		The primary function of SS7 / C7 is to provide call control, remote network management, and maintenance capabilities for the inter- office telephone network.
	www.javvin.com /protocolSS7.html (485 words)

	SS7 to SIGTRAN CONVERTER
		Tube GT1 SS7 MON, with the –SNIF option, is utilized by an international VOIP service provider to tap into the T1 monitor ports of their VOIP Gateways for non-intrusive protocol conversion of SS7 signaling into SIGTRAN Ethernet packets.
		A single centralized SS7 Protocol Analyzer is able to analyze a multi-site network of Telecom switches whose T1 SS7 communications are being probed.
		SS7 Signaling units are sent out four separate T1 interfaces or multiplexed onto a single T1 interface to the SS7 Protocol Analyzer.
	www.engageinc.com /News/SS7_sigtranPR.htm (388 words)

	SS7 Over IP SS7 Over Ethernet (Site not responding. Last check: 2007-10-10)
		SS7 signaling network elements such as local and tandem switches, Mobile Switching Centers, Signal Transfer Points and Home Location Registers that are interconnected to remote network elements by
		Carriers significantly reduce SS7 transport costs by replacing expensive long-haul dedicated signaling links with very competitively priced IP connectivity between network elements.
		Minimal IP bandwidth is required to deliver SS7 since only the message data is encapsulated into IP packets.
	www.engagecom.com /Products/iptube_ss7_SIG_T1.htm (376 words)

	Signaling System 7 (SS7) Basics, 3rd Edition
		This diagram shows that the TCAP part converts and manages messages between lower layers and the application services and when TCAP is used for mobile services it is called mobile application part (MAP).
		This diagram also shows that the TCAP functional part in the SS7 system is equivalent to the OSI network model application layer 7.
		Bowler has worked for a number of telecommunications operators including Cable and Wireless and Mercury Communications and also for Wray Castle a telecommunications training company where he was responsible for the design of training programmes for delivery on a global basis.
	www.althosbooks.com /sisy7sba3rde.html (907 words)

	OpenSS7: Status: Projects: SS7/ISDN Devices
		The OpenSS7 SS7 stack has been designed to permit new hardware devices to be easily integrated into the SS7 stack by writing a single low-level driver.
		The OpenSS7 SS7 stack has been designed to permit new network devices to be easily integrated into the SS7 stack by writing a pushable module.
		This network driver is a part of the OpenSS7 SS7 stack and allows the SS7 stack to be used without any specialized hardware devices.
	www.openss7.org /device.html (2178 words)

	Amazon.com: ISDN and SS7: Architectures for Digital Signaling Networks: Books: Uyless Black (Site not responding. Last check: 2007-10-10)
		SS7 and SS7/IP Solutions — SS7/IP products that reliably transport and route circuit-switched or IP-based SS7 traffic between IP and Pstn networks around the world.
		SS7 Solutions from Adax — Adax offers a family of high performance SS7 signaling solutions for fixed and mobile networks.
		But as a book for the beginner or someone who does not need to know SS7 inside out, then this book is easy to understand, and has appropriate coverage of both ISDN and SS7.
	www.amazon.com /ISDN-SS7-Architectures-Signaling-Networks/dp/0132591936 (1426 words)

	APEX VOICE COMMUNICATIONS
		Signaling System Seven (SS7 or C7) is a signaling architecture for performing out-of-band signaling in support of call establishment, routing and information exchange for wireline and wireless networks.
		The SS7 Module for the OmniVox3D Application Server Software provides not only high reliability, high availability as well as performance but also the flexibility to add media to the SS7 network in centralized and distributed configurations in a standards-based, true open architecture environment.
		The SS7 Module not only provides faster call set up times, but coupled with the OmniView® OAM&P and Service Creation Environment, it also allows for enhanced services to be designed, developed and deployed in a very short time.
	www.apexvoice.com /index.php/21 (520 words)

	Tech Info - SS7 Introduction
		SPs have the ability to read a point code and determine if the message is for that node and the ability to route ss7 messages to another SP.
		The MTP acts as the carrier for all ss7 messages providing reliable transfer from one SP to another (node-to-node) with error detection and correction.
		In ss7, a dialed number is referred to as a global title.
	www.zytrax.com /tech/ss7/ss7_intro.html (1603 words)

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