///////////////// Digital Switches from around the World ////////////////// // // // A Short Technical Specification rundown incl. // // The AXE 10, UXD5, TXE2/4 and DMS 100. // // // ////////////// Compiled, composed and edited by Keltic Phr0st ///////////// A word of advice : This list isn't exactly hot off the press, but covers some of the more reliable and currently used switches around the globe that have proved reliable enough to still be in service today. Unfortunately, the UXD5 units are to be decommissioned this December, which is a bit of a shame, cause you can pull some pretty neat little stunts on that 'un. =========================================================================== System : AXE 10 Manafacturer : Erricsson Country : Sweden Network : Architecture Time Concentrator, Folded TST group switch Growth Square Law Growth of S stage Security Duplicate TST Network Control Configuration : Duplicate Synchronous Capacity : Equivalent Lines 200,000 BHCA 800,000 Relationship : Developed Initially as a digital group stage for the AKE 13 SPC analogue system. =========================================================================== =========================================================================== System : DMS 100 Manafacturer : Northern Telecom Country : Canada Network : Architecture Space to Digital Concentrator 600 lines to 4 x 30 channels, TSTS folded group switch Growth By addition of TSTS modules, each switching 64 x 30 channels, maximum 32 modules Security Duplicated Network Control Configuration : Duplicate Synchronous Capacity : Equivalent Lines 100,000 BHCA About 250,000 Relationship : Design Commenced as a Trunk Switch (DMS 200) =========================================================================== =========================================================================== System : DX 200 Manafacturer : Nokia Country : Finland Network : Architecture Time Modules, 32, 2Mbit/Sec systems Growth Addition of modules Security Duplication Control Configuration : Duplicate Hot stand-by, n+1 provision of peripheral processors. Capacity : Equivalent Lines DX 210 4000; DX 220 40,000 BHCA DX 210 12,000; DX 220 100,000 Relationship : Nokia Development =========================================================================== =========================================================================== System : EWSD Manafacturer : Siemens Country : West Germany Network : Architecture Time Switch Concentrator, TST folded group switch Growth Addition to space and time stages for up to 504 x 8.192 Mbit/sec links Security Duplicated Switching Network Control Configuration : Small sizes duplicate hot stand-by, large sizes n+1 multiprocessing Capacity : Equivalent Lines 100,000 BHCA 750,000 Control capacity dependent upon choice of one of four variant control processors. Relationship : Development started from EWSA analogue SPC system =========================================================================== =========================================================================== System : E10B Manafacturer : CIT-Alcatel Country : France Network : Architecture Space Concentrator prior to A/D conversion or time switch concentration with CODEC per line, TST Group switch Growth Addition of TST Modules Security Double Dispersion of time slots in the concentration stage (URM) and between URM and Group switch Control Configuration : Functional distribution of processors with n+1 provision Capacity : Equivalent Lines 60,000 BHCA 300,000 Relationship : Development based upon E10A system, the pioneering digital switching development =========================================================================== =========================================================================== System : GTD 5EAX Manafacturer : GTE Country : USA Network : Architecture Assumes seperate line Concentrator, TST folded group switch Growth Square law growth of S stage Security Duplicated TST Network Control Configuration : Multiple Processor pairs each duplicate hot stand-by Capacity : Equivalent Lines 145,000 BHCA 720,000 claimed but only 280k possible to circa 1985 using 7 telephony processors. Relationship : Trunk switch development later used for local switch, International version GTD-5C uses Protel UT 10/3 concentrator/small exchange system =========================================================================== =========================================================================== System : NEAX 61 Manafacturer : NEC Country : Japan Network : Architecture Analogue Concentrator, up to 22 duplicated TS switches folded and fully interconnected at outlets to S stage Growth By addition of Modules Security Duplication Control Configuration : Call Processor pair per 1 or 2 Network Modules, O&M Processor pair per exchange. Each pair operate in "Synchronous stand-by" Capacity : Equivalent Lines 100,000 BHCA 700,000 Relationship : =========================================================================== =========================================================================== System : PROTEL UT 10/3/GTD 5C Manafacturer : ITALCOM Joint Venture : ItalTel, GTE, Telettra Country : Italy Network : Architecture UT 10/3 is small exchange part of family, Main exchange GTD 5C Similar to GTD 5 EAX, Up to 16 T Modules fully interconnected. Growth Addition of Modules Control Configuration : For UT 10/3 Module control processor per module plus central administration processor. Duplicate Hot stand-by. Capacity : Equivalent Lines 20,000 BHCA 120,000 Relationship : UT 10/3 was Telettra development =========================================================================== =========================================================================== System : SYSTEM X Manafacturer : PLESSEY/GEC Country : UK Network : Architecture Digital Concentrator plus TST Group switch. Growth Addition of T stages; square law growth of S stage Security Duplicated Network Control Configuration : Multiprocessing Capacity : Equivalent Lines 60,000 BHCA 500,000 * Relationship : Fundamental Philosophy of seperate sub-systems. A Version of #7 CCS is used to communicate between sub-systems. * UK Throughput figures include allowance for overload situations. They may therefore appear conservative compared with claims of other systems. =========================================================================== =========================================================================== System : SYSTEM 12 Manafacturer : ITT Country : Belgium, West Germany, Italy, Spain and USA Network : Architecture Distributed architecture based on self-seeking switch module combining T&S Switching. Growth Addition of T&S stages Security Duplication of Network paths Control Configuration : Distirbuted Control Capacity : Equivalent Lines 100,000 BHCA In Theory, Unlimited. Capacity increased by adding control elements. Relationship : Basic Idea of ditributed processing probably emerged from Plessey development of PP 250 Processor in early 1970's. Some of Plessey team formed nucleus of ITT 1240 system definition team. =========================================================================== =========================================================================== System : UXD5 Manafacturer : Designed by BT, manafactured by Plessey and GEC. Country : UK Network : Architecture 96-Port and 32-Port multiplexes with T stage Interconnection. Growth Addition of Multiplexes Security Duplicate T Stage Control Configuration : Duplicate Cold Stand-by Capacity : Equivalent Lines 600 BHCA Relationship : Developed from the Monarch digital PABX =========================================================================== =========================================================================== System : 5 ESS Manafacturer : AT&T Country : USA Network : Architecture Analogue Concentrator. TST group switch folded at S Stage Growth By Addition of switching modules Security Duplication Control Configuration : Duplicate Hot Stand-by Capacity : Equivalent Lines 60,000 BHCA 150,000 Relationship : Similar control concepts and software practise to other ESS Products. =========================================================================== -=[ KpT ]=- -=[ KpT ]=- -=[ KpT ]=- -=[ KpT ]=- -=[ KpT ]=- -=[ KpT ]=- ===========================================================================