- Switching Control Center System
The Switching Control Center System was an
Operations Support Systemdeveloped by Bell Laboratoriesand deployed during the early 1970s. This computersystem was first based on the PDP-11product line from Digital Equipment Corporationand used the CB Unix operating systemand custom application softwareand device driversthat was developed and maintained by Bell Labsin Columbus, OhioUSA. SCCS was ported to the AT&T 3B20 and 3B5 computers running UNIX_System_VRelease 2 in the early 1980s.
Prior to the SCCS, many
telephone companyswitching 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 Researchnow [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 companynetwork operations staff. The SCCS accepted as input the slow 110 baud teletypemessages from circuit switching systemssuch 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&Tinternal Bell System Practices during the 1970s.
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