Switching Control Center System


Switching Control Center System

The Switching Control Center System was an Operations Support System developed by Bell Laboratories and deployed during the early 1970s. This computer system was first based on the PDP-11 product line from Digital Equipment Corporation and used the CB Unix operating system and custom application software and device drivers that was developed and maintained by Bell Labs in Columbus, Ohio USA. SCCS was ported to the AT&T 3B20 and 3B5 computers running UNIX_System_V Release 2 in the early 1980s.

Prior to the SCCS, many telephone company switching centers were staffed 24 hours a day 365 days a year. Deployment of the SCCS allowed telephone companies to significantly reduce the number of technicians by implementing a local switching control center office and dispatch technicians as required to resolve problems or perform routine maintenance operations.

During the early 1970s, telephone companies also phased out the older electromechanical switching systems such as the Number 1 Crossbar, Number 5 Crossbar, and Step-By-Step circuit switching systems and replace them with newer electronic switching systems that were controlled by proprietary computers but still used analog switch fabrics such as Bell-proprietary [http://www.ieee.org/portal/cms_docs_iportals/iportals/aboutus/history_center/oral_history/pdfs/Andrews380.pdf fereed switch devices] .

The SCCS system was phased out during the late 1980s and replaced by an OSS known as [http://www.telcordia.com/products/nma/index.html Network Monitoring and Analysis] or NMA that was developed by Bell Communications Research now [http://www.telcordia.com Telcordia Technologies] . AT&T developed products based on SCCS, such as Compulert, which were not covered by the 1984 consent degree.

The primary purpose of the SCCS system was to provide operations, administration, maintenance, and provisioning (OAMP) functions for telephone company network operations staff. The SCCS accepted as input the slow 110 baud teletype messages from circuit switching systems such as the Number 1 ESS, Number 2 ESS, Number 3 ESS, Number 5 ESS, and Traffic Service Position System (TSPS) network switches and provide analysis, reports, troubleshooting support, and other functions using newer faster DataSpeed-40 terminals.

This system was documented in the Bell System Technical Journal and AT&T internal Bell System Practices during the 1970s.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • joint communications control center — The aggregation of all the joint communications systems in a theater. The joint communications network includes the joint multi channel trunking and switching system and the joint command and control communications system(s). Also called JCN …   Military dictionary

  • Control-Alt-Delete — This article is about the keyboard combination. For a list of keyboard shortcuts, see Table of keyboard shortcuts. For other uses, see Control Alt Delete (disambiguation). The keys Control Alt Delete highlighted on a QWERTY keyboard. Control Alt… …   Wikipedia

  • Operations support system — Operations support systems (also called operational support systems or OSS) are computer systems used by telecommunications service providers. The term OSS most frequently describes network systems dealing with the telecom network itself,… …   Wikipedia

  • Worldwide Military Command and Control System — The Worldwide Military Command and Control System (or WWMCCS) was a military command and control system implemented for the command and control of the United States military. It was created in the days following the Cuban Missile Crisis. WWMCCS… …   Wikipedia

  • The Australian Advanced Air Traffic System — TAAATS (pronounced tats ) is the hardware and software system used by Airservices Australia for Air Traffic Control services. It is a computer based system, which serves as an aid to Air Traffic Controllers. It does not control aircraft, but… …   Wikipedia

  • Supervisory control — is a general term for control of many individual controllers or control loops, whether by a human or an automatic control system, although almost every real system is a combination of both. A more specific use of the term is for a SCADA system,… …   Wikipedia

  • Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …   Wikipedia

  • Reconfigurable Manufacturing System — A reconfigurable manufacturing system (RMS) is one designed at the outset for rapid change in its structure, as well as its hardware and software components, in order to quickly adjust its production capacity and functionality within a part… …   Wikipedia

  • Network switching subsystem — (NSS) (or GSM core network) is the component of a GSM system that carries out call switching and mobility management functions for mobile phones roaming on the network of base stations. It is owned and deployed by mobile phone operators and… …   Wikipedia

  • Mobile Switching Center — Der Begriff Mobile Switching Center (MSC) bzw. Mobile Vermittlungsstelle (MVS) bezeichnet einen Bestandteil des digitalen GSM und UMTS Mobilfunknetzes. Datei:Mobilfunknetz 2G Struktur.jpg Position des MSC im Mobilfunknetz Das Mobile Switching… …   Deutsch Wikipedia