Tst & Sts Switching
Description:
This invention relates in general to time space time (TST) telecommunication system switches, and, in particular, to TST switches for interconnecting digital Time Division Multiplex (TDM) communication lines, using two basic modules, a plurality of time switching modules and a plurality of space switching modules. A time folded TST switch concept is taught and claimed in co-pending application, Ser. No. 497,214, filed Aug. 14, 1974 with two of the co-inventors here being common co-inventors with another inventor thereof.
Time Space Time (TST) switches are a particularly useful configuration of switching elements providing both time and space translation between channels of Time Division Multiplexed (TDM) telecommunications transmission lines. A TST switch interconnects digital bi-directional TDM communication lines with TDM communication involving the sharing of single transmission paths, individually, in time to provide multiple channels in a single transmission medium. This is a fundamental system improvement in telephone communications that should prove helpful in reducing cost of ordinary telephone service, and in enhancing the ability to provide many new kinds of service in meeting expanded communications needs. Electromechanical crossbar and relay switching systems, as generally used today in telecommunications switching have, for practical purposes, reached the limit of their capabilities. Extensive, continued adherence to these older technologies severely restricts capability, and greatly increases costs of telecommunication systems; and, particularly so with the expansion to systems of great size and complexity. While many advances have been made in capability and efficiency in the transmission area, with microwave, satellite, and high-capacity cable, and with both analog and digital repeaters and terminals being used, the exchange plant, including switching equipment in central offices and branch exchanges, remain in essence the same as in
This invention relates in general to time space time (TST) telecommunication system switches, and, in particular, to TST switches for interconnecting digital Time Division Multiplex (TDM) communication lines, using two basic modules, a plurality of time switching modules and a plurality of space switching modules. A time folded TST switch concept is taught and claimed in co-pending application, Ser. No. 497,214, filed Aug. 14, 1974 with two of the co-inventors here being common co-inventors with another inventor thereof.
Time Space Time (TST) switches are a particularly useful configuration of switching elements providing both time and space translation between channels of Time Division Multiplexed (TDM) telecommunications transmission lines. A TST switch interconnects digital bi-directional TDM communication lines with TDM communication involving the sharing of single transmission paths, individually, in time to provide multiple channels in a single transmission medium. This is a fundamental system improvement in telephone communications that should prove helpful in reducing cost of ordinary telephone service, and in enhancing the ability to provide many new kinds of service in meeting expanded communications needs. Electromechanical crossbar and relay switching systems, as generally used today in telecommunications switching have, for practical purposes, reached the limit of their capabilities. Extensive, continued adherence to these older technologies severely restricts capability, and greatly increases costs of telecommunication systems; and, particularly so with the expansion to systems of great size and complexity. While many advances have been made in capability and efficiency in the transmission area, with microwave, satellite, and high-capacity cable, and with both analog and digital repeaters and terminals being used, the exchange plant, including switching equipment in central offices and branch exchanges, remain in essence the same as in
References: SWITCHING SYSTEM FOR TDM DATA WHICH INDUCES AN ASYNCHRONOUS SUBMULTIPLEX CHANNEL Closs - March, 1974 - 3796835 TIME DIVISION MULTIPLEX SWITCHING SYSTEM UTILIZING ALL TIME DIVISION TECHNIQUES Krupp - June, 1973 - 3740480 TIME-DIVISION SWITCH PROVIDING TIME AND SPACE SWITCHING Gordon - February, 1973 - 3715505